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Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
Using Mockito
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Using Mockito

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Slides used to introduce Mockito

Slides used to introduce Mockito

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  • out of reach:
    * too hard to setup
    * Singletons
    * Interfaces without proper classes
  • Transcript

    • 1. Using Mockito
    • 2. This work by Fredrik Wendt is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License http://creativecommons.org/licenses/by-nc-sa/3.0/
    • 3. Outline • mock(ClassToMock.class) • when(methodCall) ● thenReturn(value) ● thenThrow(Throwable) • verify(mock).method(args) • @Mock • initMocks(this) • assertThat(obj, matcher) • Eclipse IDE tips
    • 4. Why Mockito - and when? Use Mockito to get ”smart” fake implementations of classes or interfaces out of your reach.
    • 5. Classical 3A Test @Test public void test() throws Exception { // Arrange // Act // Assert }
    • 6. Classical 3A Test @Test public void test() throws Exception { // Arrange UnitToTest testee = new UnitToTest(); Helper helper = new Helper(); // Act testee.doSomething(helper); // Assert assertTrue(helper.somethingHappened()); }
    • 7. Mockito ”Template” Usage @Test public void test() throws Exception { // Arrange, prepare behaviour Helper aMock = mock(Helper.class); when(aMock.isCalled()).thenReturn(true); // Act testee.doSomething(aMock); // Assert - verify interactions verify(aMock).isCalled(); }
    • 8. when(...).then*(...) when(methodIsCalled).thenReturn(aValue); when(methodIsCalled).thenThrow(anException);
    • 9. Real Code Properties properties = mock(Properties.class); when(properties.get(”shoeSize”)).thenReturn(”42”); String result = properties.get(”shoeSize”); assertEquals(”42”, result);
    • 10. Real Code Properties properties = mock(Properties.class); when(properties.get(”shoeSize”)).thenReturn(”42”); String result = properties.get(”shoeSize”); assertEquals(”42”, result); // optional verify(properties).get(”shoeSize”);
    • 11. when(...) when(methodIsCalled) aMockObject.method(arguments...) properties.get(”42”) properties.get(anyString()) properties.get(eq(”42”))
    • 12. thenReturn(value) Properties properties = mock(Properties.class); when(properties.get(”shoeSize”)) .thenReturn(”42”)); String value = properties.get(”shoeSize”); assertEquals(”42”, value);
    • 13. thenThrow(Exception) Properties properties = mock(Properties.class); when(properties.get(”shoooSize”)) .thenThrow(new IllegalArgumentException(...)); try { properties.get(”shoooSize”); fail(”shoooSize is misspelled”); } catch (IllegalArgumentException e) { // good! :) }
    • 14. thenReturn(...) Properties properties = mock(Properties.class); when(properties.get(”shoeSize”)) .thenReturn(”42”, ”43”, ”44”)); assertEquals(”42”, properties.get(”shoeSize”)); assertEquals(”43”, properties.get(”shoeSize”)); assertEquals(”44”, properties.get(”shoeSize”)); assertEquals(”44”, properties.get(”shoeSize”)); assertEquals(”44”, properties.get(”shoeSize”)); assertEquals(”44”, properties.get(”shoeSize”));
    • 15. Creating Mock Objects ClassToMock mockObject = mock(ClassToMock.class); egentligen: Mockito.mock(ClassToMock.class);
    • 16. Creating Mock Objects ClassToMock mockObject = mock(ClassToMock.class); @Mock ClassToMock mockObject; @Before public void setup() { MockitoAnnotations.initMocks(this); }
    • 17. Verifying Invocation On Mocks // simple ”equals” verify(properties).get(”property”); // matchers verify(properties).get(eq(”property”));
    • 18. The IDE Can Help 1 • Window » Preferences » Java » Editor » Content Assistant » Favorites ● org.junit.Assert.* assertTrue() ● org.mockito.Mockito.* mock() ● org.mockito.MockitoAnnotations @Mock ● org.mockito.BDDMockito.* given().then*()
    • 19. The IDE Can Help 2 • Window » Preferences » Java » Editor » Templates ${staticImport:importStatic( 'org.mockito.MockitoAnnotations. initMocks')} @${beforeAnnotation: newType(org.junit.Before)} public void ${setUp}() { initMocks(this); ${cursor} }
    • 20. The IDE Can Help 3 • Window » Preferences » Java » Editor » Templates tdd @Test public void ${test} throws Exception { // Arrange // Act // Assert }
    • 21. public class EmptyMatcher extends TypeSafeMatcher<Collection <?>> { @Override public boolean matchesSafely(Collection<?> c) { return c.isEmpty(); } public void describeTo(Description desc) { desc.appendText("empty"); } @Factory public static <T> Matcher<? super Collection<?>> isEmpty() { return new EmptyMatcher(); } }

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