Testing Robots (Kotlin Night, May 2016)

Libraries like Espresso allow UI tests to have stable interactions with your app, but without discipline these tests can become hard to manage and require frequent updating. This talk will cover how the so-called robot pattern allows you to create stable, readable, and maintainable tests with the aid of Kotlin's language features.

http://info.jetbrains.com/Kotlin-Night-2016.html

Video: https://youtu.be/7Y3qIIEyP5c

Transcript

1. Jake Wharton Testing Robots
4. A View A
5. A View A Presenter A Model A
6. Presenter Model View A Unit Test A Fake Model
7. Presenter Model View Unit Test
8. View Presenter Model
9. View
10. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
11. Send $42 to "foo@bar.com". Verify success. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
12. • Enter "42" with the number pad. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send Send $42 to "foo@bar.com". Verify success.
13. Send $42 to "foo@bar.com". Verify success. • Enter "42" with the number pad. • Tap on the input box marked "Recipient". $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
14. Send $42 to "foo@bar.com". Verify success. • Enter "42" with the number pad. • Tap on the input box marked "Recipient". • Type "foo@bar.com". $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
15. Send $42 to "foo@bar.com". Verify success. • Enter "42" with the number pad. • Tap on the input box marked "Recipient". • Type "foo@bar.com". • Press the button marked "Send". $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
16. Send $42 to "foo@bar.com". Verify success. • Enter "42" with the number pad. • Tap on the input box marked "Recipient". • Type "foo@bar.com". • Press the button marked "Send". • Verify success screen is shown. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
17. PaymentScreen pay = (PaymentScreen) obtainScreen(); $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
18. PaymentScreen pay = (PaymentScreen) obtainScreen();
 pay.amountView.setValue(42_00);
 pay.recipientView.setText("foo@bar.com"); $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
19. PaymentScreen pay = (PaymentScreen) obtainScreen();
 pay.amountView.setValue(42_00);
 pay.recipientView.setText("foo@bar.com");
 pay.sendView.click(); $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
20. PaymentScreen pay = (PaymentScreen) obtainScreen();
 pay.amountView.setValue(42_00);
 pay.recipientView.setText("foo@bar.com");
 pay.sendView.click();
 
 Thread.sleep(1000); $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
21. PaymentScreen pay = (PaymentScreen) obtainScreen();
 pay.amountView.setValue(42_00);
 pay.recipientView.setText("foo@bar.com");
 pay.sendView.click();
 
 Thread.sleep(1000);
 
 assertThat(obtainScreen())
 .isInstanceOf(SuccessScreen.class); $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send
22. A Test A PaymentScreen pay = (PaymentScreen) obtainScreen();
 pay.amountView.setValue(42_00);
 pay.recipientView.setText("foo@bar.com");
 pay.sendView.click();
 
 Thread.sleep(1000);
 
 assertThat(obtainScreen())
 .isInstanceOf(SuccessScreen.class); Presenter View Fake Model
23. Presenter View Fake Model A Test A
24. Presenter A View A Fake Model Test
25. Presenter Fake Model Test View Send $42 to "foo@bar.com". Verify success.
26. Presenter View Fake Model Test
27. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send findViewWithText("4").click();
 findViewWithText("2").click();
28. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send findViewWithText("4").click();
 findViewWithText("2").click();
 findViewWithHint("Recipient").setText("foo@bar.com");
29. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send findViewWithText("4").click();
 findViewWithText("2").click();
 findViewWithHint("Recipient").setText("foo@bar.com");
 findViewWithText("Send").click();
30. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send findViewWithText("4").click();
 findViewWithText("2").click();
 findViewWithHint("Recipient").setText("foo@bar.com");
 findViewWithText("Send").click();
 
 Thread.sleep(1000);
31. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send findViewWithText("4").click();
 findViewWithText("2").click();
 findViewWithHint("Recipient").setText("foo@bar.com");
 findViewWithText("Send").click();
 
 Thread.sleep(1000);
 
 findViewWithText("Success!");
32. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send onView(withText("4")).perform(click());
 onView(withText("2")).perform(click());
 onView(withHint("Recipient")).perform(typeText("foo@bar.com"));
 onView(withText("Send")).perform(click());
 
 onView(withText("Success!")).check(visible()); find W 
 find W 
 find W .set 
 find W 
 Thread.sleep(1000);
 
 find W
33. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send onView(withText("4")).perform(click());
 onView(withText("2")).perform(click());
 onView(withHint("Recipient")) .perform(typeText("foo@bar.com"));
 onView(withText("Send")).perform(click());
 
 onView(withText("Success!")).check(visible()); Send $42 to "foo@bar.com". Verify success.
34. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send onView(withText("4")).perform(click());
 onView(withText("2")).perform(click());
 onView(withHint("Recipient")) .perform(typeText("foo@bar.com"));
 onView(withText("Send")).perform(click());
 
 onView(withText("Success!")).verify(visible()); Send $42 to "foo@bar.com". Verify success. What How
35. Presenter View Fake Model Test
36. Presenter View Fake Model Test What How
37. Presenter View Fake Model Test What How What & How
38. Presenter View Fake Model Robot Test What How What How
39. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 }A
40. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 PaymentRobot amount(long amount) {
 // ...
 }B
 }A
41. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 PaymentRobot amount(long amount) {
 // ...
 }B
 
 PaymentRobot recipient(String recipient) {
 // ...
 }C
 }A
42. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 PaymentRobot amount(long amount) {
 // ...
 }B
 
 PaymentRobot recipient(String recipient) {
 // ...
 }C
 
 PaymentRobot send() {
 // ...
 }D
 }A
43. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 PaymentRobot amount(long amount) {
 // ...
 }B
 
 PaymentRobot recipient(String recipient) {
 // ...
 }C
 
 ResultRobot send() {
 // ...
 }D
 }A
 
 class ResultRobot {
 }E 
 
 
 
 
 
 
 
 Payment
44. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 PaymentRobot amount(long amount) {
 // ...
 }B
 
 PaymentRobot recipient(String recipient) {
 // ...
 }C
 
 ResultRobot send() {
 // ...
 }D
 }A
 
 class ResultRobot {
 ResultRobot isSuccess() {
 // ...
 }F
 }E
45. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 PaymentRobot amount(long amount) {
 long dollars = amount / 100;
 String dollarString = String.valueOf(dollars);
 for (int i = 0; i < dollarString.length(); i++) {
 onView(withText(dollarString.substring(i, i + 1))).perform(click());
 }
 long cents = amount - (dollars * 100);
 if (cents != 0) {
 onView(withText(".")).perform(click());
 String centsString = String.valueOf(cents);
 for (int i = 0; i < centsString.length(); i++) {
 onView(withText(centsString.substring(i, i + 1))).perform(click());
 }
 }
 return this;
 }B
 
 PaymentRobot recipient(String recipient) {
 onView(withHint("Recipient")).perform(typeType("foo@bar.com"));
 return this;
 }C
 
 ResultRobot send() {
 onView(withText("Send")).perform(click());
 return new ResultRobot();
 }D
 }A
 
 class ResultRobot {
 ResultRobot isSuccess() {
 onView(withText("Success!")).verify(visible());
 return this;
 }F
 }E
46. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
47. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 payment.amount(42_00);
48. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 payment.amount(42_00);
 payment.recipient("foo@bar.com");
49. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 payment.amount(42_00);
 payment.recipient("foo@bar.com")
 payment.send();
50. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 payment.amount(42_00);
 payment.recipient("foo@bar.com")
 ResultRobot result = payment.send();
51. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 payment.amount(42_00);
 payment.recipient("foo@bar.com")
 ResultRobot result = payment.send(); result.isSuccess();
52. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 result.isSuccess();
53. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 result.isSuccess(); Send $42 to "foo@bar.com". Verify success.
54. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 result.isSuccess(); Send $42 to "foo@bar.com". Verify success. What
55. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send class PaymentRobot {
 PaymentRobot amount(long amount) {
 long dollars = amount / 100;
 String dollarString = String.valueOf(dollars);
 for (int i = 0; i < dollarString.length(); i++) {
 onView(withText(dollarString.substring(i, i + 1))).perform(click());
 }
 long cents = amount - (dollars * 100);
 if (cents != 0) {
 onView(withText(".")).perform(click());
 String centsString = String.valueOf(cents);
 for (int i = 0; i < centsString.length(); i++) {
 onView(withText(centsString.substring(i, i + 1))).perform(click());
 }
 }
 return this;
 }B
 
 PaymentRobot recipient(String recipient) {
 onView(withHint("Recipient")).perform(typeType("foo@bar.com"));
 return this;
 }C
 
 ResultRobot send() {
 onView(withText("Send")).perform(click());
 return new ResultRobot();
 }D
 }A
 
 class ResultRobot {
 ResultRobot isSuccess() {
 onView(withText("Success!")).verify(visible());
 return this;
 }F
 }E How
56. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send PaymentRobot payment = new PaymentRobot();
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 result.isSuccess();
57. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send @Test public void singleFundingSourceSuccess() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }A
58. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send @Test public void singleFundingSourceSuccess() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }A
 
 @Test public void singleFundingSourceTooMuch() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(1_000_000_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }B
59. $0 1 2 3 4 5 6 7 8 9 0 < . Recipient Send @Test public void singleFundingSourceSuccess() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }A
 
 @Test public void singleFundingSourceTooMuch() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(1_000_000_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }B 
 
 @Test public void singleFundingSourceInsufficientFunds() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(1_000_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }C
60. @Test public void singleFundingSourceSuccess() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }A
 
 @Test public void singleFundingSourceTooMuch() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(1_000_000_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }B 
 
 @Test public void singleFundingSourceInsufficientFunds() {
 PaymentRobot payment = new PaymentRobot();
 
 ResultRobot result = payment
 .amount(1_000_00)
 .recipient("foo@bar.com")
 .send();
 
 result.isSuccess();
 }C 
 @Test public void networkErrorAllowsRetry() {
 // ...
 } 
 
 
 
 @Test public void multipleFundingSourcesSuccess() {
 // ...
 } 
 
 
 
 
 
 
 
 
 @Test public void multipleFundingSourcesOneDisabled() {
 // ...
 } 
 
 
 
 
 
 
 
 
 
 
 
 
 @Test public void multipleFundingSourcesInsufficientUsesOther() {
 // ...
 } 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 @Test public void multipleFundingSourcesAllInsufficient() {
 // ...
 } 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 @Test public void unauthenticatedLogsOut() {
 // ...
 } 
 @Test public void rotationRetainsAmountAndRecipient() {
 // ...
 } 
 
 @Test public void serverErrorShowsTryAgainLater() {
 // ...
 }
61. Presenter View Fake Model Robot Test
62. Presenter View Fake Model Robot Test Test Test Test Test Test Test Test Test Test Test
63. PaymentRobot payment = new PaymentRobot();
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 result.isSuccess();
64. class PaymentRobot {
 PaymentRobot amount(long amount) {A
 // ...
 }B
 
 PaymentRobot recipient(String recipient) {B
 // ...
 }C
 
 ResultRobot send() {C
 // ...
 }D
 }A
 
 class ResultRobot {
 ResultRobot isSuccess() {D
 // ...
 }F
 }E
65. class PaymentRobot {
 fun amount(amount: Long): PaymentRobot {A
 // ...
 }B 
 fun recipient(recipient: String): PaymentRobot {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess(): ResultRobot {D
 // ...
 }F
 }E
66. val
 
 val PaymentRobot payment = new PaymentRobot();
 ResultRobot result = payment
 .amount(42_00)
 .recipient("foo@bar.com")
 .send();
 result.isSuccess();
67. val payment = PaymentRobot()
 
 val result = payment
 .amount(4200)
 .recipient("foo@bar.com")
 .send()
 
 result.isSuccess()
68. class PaymentRobot {
 fun amount(amount: Long): PaymentRobot {A
 // ...
 }B 
 fun recipient(recipient: String): PaymentRobot {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess(): ResultRobot {D
 // ...
 }F
 }E
69. class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
70. fun payment() = PaymentRobot() class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
71. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot() class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
72. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
73. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
74. val payment = PaymentRobot()
 
 val result = payment
 .amount(4200)
 .recipient("foo@bar.com")
 .send()
 
 result.isSuccess()
75. val result = payment {
 amount(4200)
 recipient("foo@bar.com")
 }.send()
 
 result.isSuccess()
76. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(): ResultRobot {C
 // ...
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
77. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(func: ResultRobot.() -> Unit): ResultRobot {C
 // ... return ResultRobot().apply { func() }
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
78. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(func: ResultRobot.() -> Unit): ResultRobot {C
 // ... return ResultRobot().apply { func() }
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
79. val result = payment {
 amount(4200)
 recipient("foo@bar.com")
 }.send()
 
 result.isSuccess()
80. payment {
 amount(4200)
 recipient("foo@bar.com")
 }.send {
 isSuccess()
 }A
81. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 fun send(func: ResultRobot.() -> Unit): ResultRobot {C
 // ... return ResultRobot().apply { func() }
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
82. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 infix fun send(func: ResultRobot.() -> Unit): ResultRobot {C
 // ... return ResultRobot().apply { func() }
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
83. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() } class PaymentRobot {
 fun amount(amount: Long) {A
 // ...
 }B 
 fun recipient(recipient: String) {B
 // ...
 }C
 
 infix fun send(func: ResultRobot.() -> Unit): ResultRobot {C
 // ... return ResultRobot().apply { func() }
 }D
 }A 
 class ResultRobot {
 fun isSuccess() {D
 // ...
 }F
 }E
84. payment {
 amount(4200)
 recipient("foo@bar.com")
 } send {
 isSuccess()
 }A .
85. payment {
 amount(4200)
 recipient("foo@bar.com")
 } send {
 isSuccess()
 }A
86. payment { 
 amount(4200)
 recipient("foo@bar.com")
 } send {
 isSuccess()
 }A Screen entry point Actions and/or assertions Screen transition Actions and/or assertions
87. Exception in thread "main" java.lang.AssertionError: Expected <Success!> but found <Failed!> at ResultRobot.isSuccess(ResultRobot.kt:18) at PaymentTest$singleFundingSourceSuccess$2.invoke(PaymentTest.kt:27) at PaymentRobot.send(PaymentRobot.kt:13) at PaymentTest.singleFundingSourceSuccess(PaymentTest.kt:8)
88. payment {
 amount(4200)
 recipient("foo@bar.com") } send { isSuccess() }A
89. payment {
 amount(4200)
 recipient("foo@bar.com") send() } birthday { date(1970, 1, 1) next() } ssn { value("123-56-7890") next() } result { isSuccess() }A
90. fun payment(func: PaymentRobot.() -> Unit) = PaymentRobot().apply { func() }
91. fun payment(func: PaymentRobot.() -> Unit) { onView(withText("$0")).check(visible()) return PaymentRobot().apply { func() } }
92. fun payment(func: PaymentRobot.() -> Unit) { onView(withText("$0")).check(visible()) return PaymentRobot().apply { func() } } fun birthdate(func: BirthdateRobot.() -> Unit) { onView(withText("Enter birth date:")).check(visible()) return BirthdateRobot().apply { func() } } fun ssn(func: SsnRobot.() -> Unit) { onView(withText("Enter social security number:")).check(visible()) return SsnRobot().apply { func() } } fun result(func: ResultRobot.() -> Unit) { return ResultRobot().apply { func() } }
93. Presenter View Model Robot Test
94. Presenter View Model Robot Test Application Architecture
95. Presenter View Model Robot Test UI Test Architecture
96. jakewharton jakewharton jakewharton twitter.com/ google.com/+ .com Testing Robots