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E M B R A C I N G T D D - N O V I C E T O I N T E R M E D I AT E

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S H O R T S T O RY

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I D E A - > I M PA C T

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V I R A J K H ATAV K A R • Founder, Tantra-Gyan ( T-G ) • PHP Services • Joomla Development • WordPress Development • UI / UX Design and Development • Angular

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V I R A J K H ATAV K A R • Founder, Tantra-Gyan ( T-G ) • PHP Services • Joomla Development • WordPress Development • UI / UX Design and Development • Angular • @virajkhatavkar • [email protected]

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“As a software developer we should be solving the right problems for businesses”

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C A M B R I D G E U N I V E R S I T Y S T U D Y S TAT E S S O F T WA R E B U G S C O S T E C O N O M Y $ 3 1 2 B I L L I O N

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C H A L L E N G E S • Code riddled with defects • Nightmare to maintain, slow to develop • Failing to meet actual needs

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C H A L L E N G E S • Code riddled with defects • Nightmare to maintain, slow to develop • Failing to meet actual needs

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C H A L L E N G E S • Code riddled with defects • Nightmare to maintain, slow to develop • Failing to meet actual needs

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S O L U T I O N : T E S T I N G

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D E S I G N C O D E T E S T

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T E S T I N G AT L A S T M AY L E AV E H O L E S I N Y O U R T E S T C O V E R A G E

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W R I T E A FA I L I N G T E S T

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W R I T E A FA I L I N G T E S T M A K E T H E T E S T PA S S

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W R I T E A FA I L I N G T E S T M A K E T H E T E S T PA S S R E FA C T O R

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W R I T E A FA I L I N G T E S T M A K E T H E T E S T PA S S R E FA C T O R TDD

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O N LY E V E R W R I T E C O D E T O F I X A FA I L I N G T E S T

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public function test_create_project_class_is_initializable()
 { 
 $project = new CreateProject();
 
 $this->assertInstanceOf(CreateProject::class, $project); 
 } Create a new class

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class CreateProject
 { } Create a new class

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L I V E D E M O

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M Y F R U S T R AT I O N W H I L E D O I N G T H I S

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T H E S I M P L E I D E A O F W R I T I N G T E S T S B E F O R E C O D E D E M O L I S H E D M Y C O N C E P T O F P R O G R A M M I N G

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“TDD is a mindset, it's the way you approach a project not just how you test it. It happens to result in a fully automated set of unit tests, but these unit tests are side effects , not the ultimate goal”

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PAY M E N T G AT E WAY

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public function processPayment(array $paymentDetails)
 {
 $transaction = new \CCAvenue(self::API_ID, self::TRANS_KEY);
 $transaction->amount = $paymentDetails['amount'];
 $transaction->card_num = $paymentDetails['card_num'];
 $transaction->exp_date = $paymentDetails['exp_date'];
 
 $response = $transaction->authorizeAndCapture();
 
 return $response->approved ? true : false;
 } #Payment Class

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public function testProcessPaymentReturnsTrueOnSuccessfulPayment()
 {
 $paymentDetails = [
 'amount' => 123.99,
 'card_num' => '4111-1111-1111-1111',
 'exp_date' => '03/2013',
 ];
 
 $payment = new Payment();
 $result = $payment->processPayment($paymentDetails);
 
 $this->assertTrue($result);
 }

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FAILURES! Tests: 1, Assertions: 1, Failures: 1.

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public function processPayment(array $paymentDetails)
 {
 $transaction = new \CCAvenue(self::API_ID, self::TRANS_KEY);
 $transaction->amount = $paymentDetails['amount'];
 $transaction->card_num = $paymentDetails['card_num'];
 $transaction->exp_date = $paymentDetails['exp_date'];
 
 $response = $transaction->authorizeAndCapture();
 
 return $response->approved ? true : false;
 } #Payment Class

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public function processPayment(array $paymentDetails)
 {
 $transaction = new \CCAvenue(self::API_ID, self::TRANS_KEY);
 $transaction->amount = $paymentDetails['amount'];
 $transaction->card_num = $paymentDetails['card_num'];
 $transaction->exp_date = $paymentDetails['exp_date'];
 
 $response = $transaction->authorizeAndCapture();
 
 $response->approved ? true : false;
 } #Payment Class

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T E S T D O U B L E S • A test double is an object that can stand n for a real object in a test, similar to how a stunt double stands in for an actor in a movie.

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T E S T D O U B L E S • Dummy • Stub • Spy • Mock • Fake

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T E S T D O U B L E S • Dummy • Stub • Spy • Mock • Fake

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M O C K O B J E C T I S A C L O N E O F A N O B J E C T W H I C H W E C A N U S E T O S I M P L I F Y O U R T E S T S

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C L A S S

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C L A S S D E P E N D E N C Y

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C L A S S T E S T C L A S S D E P E N D E N C Y

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C L A S S T E S T C L A S S D E P E N D E N C Y M O C K E D D E P E N D E N C Y

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C L A S S T E S T C L A S S D E P E N D E N C Y M O C K E D D E P E N D E N C Y

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M O C K E RY • use Mockery; • $mock = Mockery::mock( SomeClass );

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public function test_example_of_mocked_class()
 {
 $mock = Mockery::mock( SomeClass::class );
 
 $mock->shouldReceive('method')->once();
 }

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public function processPayment(array $paymentDetails)
 {
 $transaction = new \CCAvenue(self::API_ID, self::TRANS_KEY);
 $transaction->amount = $paymentDetails['amount'];
 $transaction->card_num = $paymentDetails['card_num'];
 $transaction->exp_date = $paymentDetails['exp_date'];
 
 $response = $transaction->authorizeAndCapture();
 
 return $response->approved ? true : false;
 } #Payment Class

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$mock = Mockery::mock( CCAvenue::class );

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public function processPayment(array $paymentDetails)
 {
 $transaction = new \CCAvenue(self::API_ID, self::TRANS_KEY);
 $transaction->amount = $paymentDetails['amount'];
 $transaction->card_num = $paymentDetails['card_num'];
 $transaction->exp_date = $paymentDetails['exp_date'];
 
 $response = $transaction->authorizeAndCapture();
 
 return $response->approved ? true : false;
 } #Payment Class

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D E P E N D E N C Y I N J E C T I O N

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public function processPayment(\CCAvenue $transaction, array $paymentDetails)
 {
 $transaction->amount = $paymentDetails['amount'];
 $transaction->card_num = $paymentDetails['card_num'];
 $transaction->exp_date = $paymentDetails['exp_date'];
 
 $response = $transaction->authorizeAndCapture();
 
 return $response->approved ? true : false;
 } #Payment Class

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public function testProcessPaymentReturnsTrueOnSuccessfulPayment()
 {
 //Test
 }

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public function testProcessPaymentReturnsTrueOnSuccessfulPayment()
 {
 $paymentDetails = [
 'amount' => 123.99,
 'card_num' => '4111-1111-1111-1111',
 'exp_date' => '03/2013',
 ];
 }

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 $mock = Mockery::mock(\CCAvenue::class);

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$mock = Mockery::mock(\CCAvenue::class);
 
 $mock->shouldReceive('authorizeAndCapture')
 ->once()
 ->andReturn(true);

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$mock = Mockery::mock(\CCAvenue::class);
 
 $mock->shouldReceive('authorizeAndCapture')
 ->once()
 ->andReturn(true);
 
 $payment = new Payment();
 $result = $payment->processPayment($mock, $paymentDetails);

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$mock = Mockery::mock(\CCAvenue::class);
 
 $mock->shouldReceive('authorizeAndCapture')
 ->once()
 ->andReturn(true);
 
 $payment = new Payment();
 $result = $payment->processPayment($mock, $paymentDetails);
 
 $this->assertTrue($result);

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public function testProcessPaymentReturnsTrueOnSuccessfulPayment()
 {
 $paymentDetails = [
 'amount' => 123.99,
 'card_num' => '4111-1111-1111-1111',
 'exp_date' => '03/2013',
 ];
 
 $mock = Mockery::mock(\CCAvenue::class);
 
 $mock->shouldReceive('authorizeAndCapture')
 ->once()
 ->andReturn(true);
 
 $payment = new Payment();
 $result = $payment->processPayment($mock, $paymentDetails);
 
 $this->assertTrue($result);
 }

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“The motivation for mocks is design, not testing”

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“Mocks should guide you to design how your objects talk to each other”

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No content

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- K O N S TA N T I N K U D R A S H O V “Example of life is journey, not a destination. Life is more about how we approach problems and solve them. Why don’t we apply the same in software design ?”

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“A system is not the sum of its parts. It’s the product of it’s interactions…”

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B E I N G T E S T D R I V E N • High quality with TDD • Quality comes in many flavours • Less time spent fixing defects

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W H AT ’ S I N I T F O R M E ? • No more long debugging sessions • Feeling confident with my work • More time for other stuff

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T D D - T H E G R A N D I D E A • Small incremental steps • Evolutionary design • Keeping code healthy with refactoring

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I M P O R TA N T P O I N T S • Your tests should drive your design. • TDD exposes your design problems. • OOP is about communication between objects and TDD helps you in creating clear communications.

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T E S T D R I V E N D E S I G N

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T E S T D R I V E N D E S I G N

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Q U E S T I O N S ? ? ?