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How to test in Mockito for a certain order of calls with the same arguments?

I want to check the specific order in which characters to ensure that they are not distorted. I tried to write it using InOrder, but it does not seem to work, or at least in Mockito 1.8.5.

@Test
public void inOrderTest() throws IOException{
    final String message = "Hello World!\n";

    for( char c : message.toCharArray() )
        mockWriter.write( c );

    final InOrder inOrder = inOrder( mockWriter );
    for( char c : message.toCharArray() )
        inOrder.verify( mockWriter ).write( c );
    inOrder.verifyNoMoreInteractions();
}

Test failed with message:

Verification in order failure:
mockWriter.write(108);
Wanted 1 time:
-> at     org.bitbucket.artbugorski.brainfuj.interpreter.InterpreterTest.inOrderTest(InterpreterTest.java:62)
But was 3 times. Undesired invocation:
-> at org.bitbucket.artbugorski.brainfuj.interpreter.InterpreterTest.inOrderTest(InterpreterTest.java:58)

How to write a Mockito test for this?

EDIT: Filed as bug http://code.google.com/p/mockito/issues/detail?id=296

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5 answers

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private void verifyCharactersWritten( String expected ){
    ArgumentCaptor<Character> captor = ArgumentCaptor.forClass( Character.class ); 
    verify( mockWriter, times( expected.length())).write( captor.capture());
    assertEquals( Arrays.asList( expected.toCharArray()), captor.getAllValues());
}

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assertThat(stringWriter.toString(), equalTo(message));

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+2

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final List<Integer> writtenChars = new ArrayList<>();
willAnswer(
        new Answer(){
            @Override
            public Object answer( final InvocationOnMock invocation )throws Throwable {
                final int arg = (int) invocation.getArguments()[0];
                writtenChars.add( arg );
                return null;
            }
        }
    ).given( mockWriter ).write( anyInt() );

.

final Iterator<Integer> writtenCharItr = writtenChars.iterator();
for( int charInt : "Hello World!\n".toCharArray() )
    assertThat(  charInt, is( writtenCharItr.next() )  );
assertThat( "There are no more chars.", writtenCharItr.hasNext(), is(false) );
verify( mockWriter ).flush();

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0

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Unitils Mock:

Mock<Writer> mockWriter;

@Test
public void inOrderTest() throws Exception {
    Writer writer = mockWriter.getMock();
    final String message = "Hello World!\n";

    for (char c : message.toCharArray())
        writer.write(c);

    for (char c : message.toUpperCase().toCharArray())
        mockWriter.assertInvokedInSequence().write(c);
    MockUnitils.assertNoMoreInvocations();
}

JMockit ( ):

@Test
public void inOrderTest(final Writer mockWriter) throws Exception {
    final String message = "Hello World!\n";

    for (char c : message.toCharArray())
        mockWriter.write(c);

    new FullVerificationsInOrder() {{
        for (char c : message.toCharArray())
            mockWriter.write(c);
    }};
}
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