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mockito code added
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‎junit/README.md‎

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# junit
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This is repository of http://androidcode.pl blog. It shows uses JUnit in Android. It is a part of Testing - JUnit post in the blog.

‎mockito/Data.kt‎

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data class Data(var number: Int, var text: String) {
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constructor() : this(0, "")
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fun getInfo(): String {
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return "$text $number"
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}
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fun getInfo(message: String?): String {
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return "$message $number"
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}
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fun publicMethod(): String {
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return privateMethod()
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}
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private fun privateMethod(): String {
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return "private returned from public"
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}
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}

‎mockito/Manager.kt‎

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class Manager(val data: Data) {
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fun fetchData(): String {
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return data.getInfo()
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}
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fun fetchDataWithMessage(message: String): String {
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return data.getInfo(message)
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}
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}

‎mockito/README.md‎

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# mockito
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This is repository of http://androidcode.pl blog. It shows uses Mockito in Android. It is a part of Testing - Mockito post in the blog.

‎mockito/test/AnswerTest.kt‎

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@RunWith(MockitoJUnitRunner::class)
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class AnswerTest {
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@Test
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fun checkFetchDataWithObjectChangedAndReturnsItsValue() {
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val spy = spy(Data::class.java)
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val manager = Manager(mock)
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assertEquals(" 0", manager.fetchData())
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assertEquals("message 0", manager.fetchDataWithMessage("message"))
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doAnswer(Answer {
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spy.number++
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spy.text = it.arguments[0] as String
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return@Answer spy.getInfo()
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}).`when`(spy).getInfo(anyString())
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assertEquals("message 1", manager.fetchDataWithMessage("message"))
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assertEquals("message 1", manager.fetchData())
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}
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}

‎mockito/test/ConfigurationTest.kt‎

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@RunWith(MockitoJUnitRunner::class)
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class ConfigurationTest {
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@Mock
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lateinit var mock: Data
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@Spy
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lateinit var spy: Data
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lateinit var manager: Manager
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@Before
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fun init() {
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manager = Manager(mock)
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}
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@Test
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fun checkFetchDataReturnsMockValue() {
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assertNull(manager.fetchData())
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`when`(mock.getInfo()).thenReturn("mock")
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assertNull(manager.fetchData()) //now it fails
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assertEquals("mock", manager.fetchData())
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}
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@Test
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fun checkFetchDataReturnsMultipleMockValue() {
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assertNull(manager.fetchData())
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`when`(mock.getInfo()).thenReturn("mock1", "mock2")
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assertNull(manager.fetchData()) //now it fails
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assertEquals("mock1", manager.fetchData())
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assertEquals("mock2", manager.fetchData())
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assertEquals("mock2", manager.fetchData())
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}
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@Test
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fun checkFetchDataTakesMultipleArgReturnsMockValue() {
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manager = Manager(spy)
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doReturn("spy with arg").`when`(spy).getInfo("arg1")
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doReturn("spy with arg").`when`(spy).getInfo("arg2")
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assertEquals("spy with arg", manager.fetchDataWithMessage("arg1"))
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assertEquals("spy with arg", manager.fetchDataWithMessage("arg2"))
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//not possible without reset using when.thenReturn
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}
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@Test
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fun checkGetInfoForWrappedReturnsWrapperValue() {
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val data = Data()
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val spyData = Mockito.spy(data)
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manager = Manager(spyData)
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doReturn("wrapper").`when`(spyData).getInfo()
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assertEquals("wrapper", manager.fetchData())
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}
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@Test
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fun checkFetchDataWithArgsReturnsMockValue() {
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Mockito.`when`(mock.getInfo("arg")).thenReturn("mock with arg")
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assertEquals("mock with arg", manager.fetchDataWithMessage("arg"))
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assertEquals("mock with arg", manager.fetchDataWithMessage("whatever")) //fails
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`when`(mock.getInfo(anyString())).thenReturn("mock with arg")
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assertEquals("mock with arg", manager.fetchDataWithMessage("whatever")) //now it pass
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}
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@Test(expected = IllegalArgumentException::class)
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fun checkFetchDataThrowsExceptionForSpecialCharactersArg() {
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`when`(mock.getInfo("@")).thenThrow(IllegalArgumentException())
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manager.fetchDataWithMessage("@")
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}
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}

‎mockito/test/InjectMockTest.kt‎

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@RunWith(MockitoJUnitRunner::class)
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class InjectMockTest {
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@Mock
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var mock: Data? = null
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//constructor requires Data arg
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@InjectMocks
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var manager1: Manager? = null
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@Test
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fun checkIsManager1Initialized() {
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assertNotNull(mock)
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assertNotNull(manager1)
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}
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//equivalent
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@Test
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fun checkIsManager2Initialized() {
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var manager2 = Manager(mock)
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assertNotNull(mock)
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assertNotNull(manager2)
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}
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}

‎mockito/test/MockSpyTest.kt‎

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@RunWith(MockitoJUnitRunner::class)
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class MockSpyTest {
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@Mock
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var mock: Data? = null
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@Spy
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var spy: Data? = null
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@Test
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fun checkIsObjectInitialized() {
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assertNotNull(mock)
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assertNotNull(spy)
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mock?.text = "mock"
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spy?.text = "spy"
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assertEquals("mock", mock?.text) //fails mock.text is null
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assertEquals("spy", spy?.text)
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}
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}

‎mockito/test/PowerMockTest.kt‎

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@RunWith(PowerMockRunner::class)
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@PrepareForTest(Data::class, System::class)
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class PowerMockTest {
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@Test
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fun checkMockStaticMethod() {
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PowerMockito.mockStatic(System::class.java)
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PowerMockito`when`(System.currentTimeMillis()).thenReturn(100)
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assertEquals(100, System.currentTimeMillis())
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}
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@Test
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fun checkMockPrivateMethod() {
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val obj = Data()
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val spy: Data = PowerMockito.spy(obj)
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assertEquals("private returned from public", spy.publicMethod())
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PowerMockito.doReturn("private mocked").`when`(spy, "privateMethod")
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assertEquals("private mocked", spy.publicMethod())
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PowerMockito.verifyPrivate(spy, times(2)).invoke("privateMethod")
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}
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@Test
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fun checkMockConstructor() {
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val obj = Data()
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assertEquals(0, obj.number)
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assertEquals("", obj.text)
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obj.number = 1
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obj.text = "text"
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PowerMockito.whenNew(Data::class.java).withNoArguments().thenReturn(obj)
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val newObj = Data()
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assertEquals(1, newObj.number)
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assertEquals("text", newObj.text)
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}
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}

‎mockito/test/VerifyTest.kt‎

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class VerifyTest {
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lateinit var mock: Data
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lateinit var manager: Manager
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@Before
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fun init() {
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mock = mock(Data::class.java)
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manager = Manager(mock)
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}
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@Test
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fun checkHowManyTimesGetInfoCalled() {
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verifyZeroInteractions(mock) //any methods called on the mock
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verify(mock, never()).getInfo()
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manager.fetchData()
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verify(mock, times(1)).getInfo()
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verify(mock, atLeast(1)).getInfo()
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verify(mock, atMost(3)).getInfo()
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verifyNoMoreInteractions(mock) //no others method called
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}
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@Test
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fun checkArgsOfGetInfo() {
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val captor = forClass(String::class.java)
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manager.fetchDataWithMessage("message")
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//verify args passed into getInfo method
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verify(mock).getInfo(captor.capture())
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assertEquals("message", captor.value)
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}
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}

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