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Intro to Android Testing Charles “Chuck” Greb @ecgreb DevFest Conakry December 1st, 2018

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• Software Engineer • Mobile applications since 2009 • Mostly Android • Button About me

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Why test?

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• Verify code is correct • Prevent regressions • Documentation Why test?

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Testing Strategies

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• Don’t test • Manual • Automation Testing Strategies

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Types of Automated Tests

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• Unit • Integration • User Interface (UI) Types of Automated Tests

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Testing Pyramid https://martinfowler.com/bliki/TestPyramid.html

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Android Testing Pyramid

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() } reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() } reset_button.setOnClickListener { counter_view.text = counter.reset().toString() } } }

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }_ }+ }+

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) val counter = Counter() counter_view.text = counter.reset().toString() count_button.setOnClickListener { counter_view.text = counter.count().toString() }+ reset_button.setOnClickListener { counter_view.text = counter.reset().toString() }+ }+ }+

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class Counter { private var count = 0 fun count(): Int { count++ return count }+ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }+ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }+ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }+ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }+ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }+ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }_ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }_ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }_ fun reset(): Int { count = 0 return count }+ }

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class Counter { private var count = 0 fun count(): Int { count++ return count }+ fun reset(): Int { count = 0 return count }+ }

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MainActivity

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MainActivity Counter

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MainActivity Counter

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MainActivity Counter

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MainActivity Counter CounterTest JUnit

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MainActivity Counter MainActivityTest CounterTest JUnit Instrumentation

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MainActivity Counter MainActivityTest CounterTest MainActivityUiTest JUnit Instrumentation Espresso

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Unit Tests JUnit

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class CounterTest { @Test fun shouldNotBeNull() { val counter = Counter() assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test fun shouldNotBeNull() { val counter = Counter() assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test+ fun shouldNotBeNull() { val counter = Counter()+ assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test+ fun shouldNotBeNull() { val counter = Counter()+ assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test+ fun shouldNotBeNull() { val counter = Counter()+ assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test+ fun shouldNotBeNull() { val counter = Counter()+ assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test+ fun shouldNotBeNull() { val counter = Counter()+ assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test+ fun shouldNotBeNull() { val counter = Counter()+ assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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class CounterTest { @Test+ fun shouldNotBeNull() { val counter = Counter()+ assertNotNull(counter) }+ @Test fun reset_shouldReturnZero() { val counter = Counter() assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count())

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assertEquals(0, counter.reset()) }a @Test fun count_shouldIncrementNumber() { val counter = Counter() assertEquals(1, counter.count()) assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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assertEquals(0, counter.reset()) }a @Testc fun count_shouldIncrementNumber() { val counter = Counter()c assertEquals(1, counter.count())c assertEquals(2, counter.count()) assertEquals(3, counter.count()) }b @Test fun reset_shouldResetCounter() { val counter = Counter() counter.count() counter.count() counter.count() counter.reset() assertEquals(1, counter.count()) }c }d

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Integration Tests Instrumentation

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@RunWith(AndroidJUnit4::class) class MainActivityTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text)

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@RunWith(AndroidJUnit4::class) class MainActivityTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text)

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@RunWith(AndroidJUnit4::class) class MainActivityTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text)

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@RunWith(AndroidJUnit4::class) class MainActivityTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text)

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@RunWith(AndroidJUnit4::class) class MainActivityTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text)

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@RunWith(AndroidJUnit4::class) class MainActivityTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text)

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick() assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick() assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick() assertEquals("3", activityTestRule.activity.counter_view.text) }

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@Test+ fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick() assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick() assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick() assertEquals("3", activityTestRule.activity.counter_view.text) }

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@Test+ fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick() assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick() assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick() assertEquals("3", activityTestRule.activity.counter_view.text) }

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+

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@Test fun shouldNotBeNull() { assertNotNull(activityTestRule.activity) }b @Test fun counterView_shouldDisplayZeroOnCreate() { assertEquals("0", activityTestRule.activity.counter_view.text) }c @Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+

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@Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+ @Test @UiThreadTest fun counterView_shouldDisplayZeroOnResetButtonClick() { activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.reset_button.performClick() assertEquals("0", activityTestRule.activity.counter_view.text) } }

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@Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+ @Test @UiThreadTest fun counterView_shouldDisplayZeroOnResetButtonClick() { activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.reset_button.performClick() assertEquals("0", activityTestRule.activity.counter_view.text) }+ }-

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@Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+ @Test @UiThreadTest fun counterView_shouldDisplayZeroOnResetButtonClick() { activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.reset_button.performClick() assertEquals("0", activityTestRule.activity.counter_view.text) }+ }--

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@Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+ @Test @UiThreadTest fun counterView_shouldDisplayZeroOnResetButtonClick() { activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.reset_button.performClick() assertEquals("0", activityTestRule.activity.counter_view.text) }+ }-

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@Test @UiThreadTest+ fun counterView_shouldDisplayNewCountOnCountButtonClick() { activityTestRule.activity.count_button.performClick()+ assertEquals("1", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("2", activityTestRule.activity.counter_view.text) activityTestRule.activity.count_button.performClick()+ assertEquals("3", activityTestRule.activity.counter_view.text) }+ @Test @UiThreadTest fun counterView_shouldDisplayZeroOnResetButtonClick() { activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.count_button.performClick() activityTestRule.activity.reset_button.performClick() assertEquals("0", activityTestRule.activity.counter_view.text) }+ }-

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UI Tests Espresso

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test+ fun counterView_shouldDisplayZeroOnCreate() { +onView(withId(R.id.counter_view)).check(matches(withText(“0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@RunWith(AndroidJUnit4::class) class MainActivityUiTest { @get:Rule val activityTestRule: ActivityTestRule = ActivityTestRule(MainActivity::class.java, false, false) @Before fun setUp() { activityTestRule.launchActivity(Intent()) }a @Test fun counterView_shouldDisplayZeroOnCreate() { onView(withId(R.id.counter_view)).check(matches(withText("0"))) }b @Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())a onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click())b onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click())c onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())a onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())a onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())a onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click())a onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.count_button)).perform(click())+ onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }

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@Test fun counterView_shouldDisplayNewCountOnCountButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("1"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("2"))) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("3"))) }a @Test fun counterView_shouldDisplayZeroOnResetButtonClick() { onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.count_button)).perform(click()) onView(withId(R.id.reset_button)).perform(click()) onView(withId(R.id.counter_view)).check(matches(withText("0"))) }a }p

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Demo

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Conclusion Testing is fun!

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• Why test? • Types of tests • Unit Tests • Integration Tests • UI Tests • Continuous Integration (CI) • Test-Driven Development (TDD) • Tests == Quality Conclusion

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Tests == Quality

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Merci Charles “Chuck” Greb @ecgreb DevFest Conakry December 1st, 2018

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