@Test
  public void shouldNotCreateStatement() {
    TokenQueue tokenQueue = spy(new TokenQueue(Arrays.asList(new Token("a", 1, 1))));
    TokenMatcher matcher = spy(new AnyTokenMatcher());
    StatementChannel channel = StatementChannel.create(matcher);
    List<Statement> output = mock(List.class);

    assertThat(channel.consume(tokenQueue, output), is(true));
    verify(matcher).matchToken(Matchers.eq(tokenQueue), Matchers.anyList());
    verifyNoMoreInteractions(matcher);
    verify(output).add(Matchers.any(Statement.class));
    verifyNoMoreInteractions(output);
  }
  @Test
  public void shouldPushForward() {
    TokenQueue tokenQueue = mock(TokenQueue.class);
    TokenMatcher matcher = mock(TokenMatcher.class);
    List<Statement> output = mock(List.class);
    StatementChannel channel = StatementChannel.create(matcher);

    assertThat(channel.consume(tokenQueue, output), is(false));
    ArgumentCaptor<List> matchedTokenList = ArgumentCaptor.forClass(List.class);
    verify(matcher).matchToken(Matchers.eq(tokenQueue), matchedTokenList.capture());
    verifyNoMoreInteractions(matcher);
    verify(tokenQueue).pushForward(matchedTokenList.getValue());
    verifyNoMoreInteractions(tokenQueue);
    verifyNoMoreInteractions(output);
  }
  @Test
  public void shouldCreateStatement() {
    Token token = new Token("a", 1, 1);
    TokenQueue tokenQueue = spy(new TokenQueue(Arrays.asList(token)));
    TokenMatcher matcher = spy(new AnyTokenMatcher());
    StatementChannel channel = StatementChannel.create(matcher);
    List<Statement> output = mock(List.class);

    assertThat(channel.consume(tokenQueue, output), is(true));
    verify(matcher).matchToken(Matchers.eq(tokenQueue), Matchers.anyList());
    verifyNoMoreInteractions(matcher);
    ArgumentCaptor<Statement> statement = ArgumentCaptor.forClass(Statement.class);
    verify(output).add(statement.capture());
    assertThat(statement.getValue().getValue(), is("a"));
    assertThat(statement.getValue().getStartLine(), is(1));
    assertThat(statement.getValue().getEndLine(), is(1));
    verifyNoMoreInteractions(output);
  }