Sunday, December 26, 2004

Using JDK 5 varags for testing

One JDK 5 feature I have started using to clean up my testing is varargs, the ... (or for the entity-aware). It is particularly elegant to turn this:

public void testWidgetProcessor() throws Exception {
    final Widget expected1 = createWidget(), expected2 = createWidget();

    processor.swallow(new Widget[]{
        expected1,
        expected2
    });

    assertWidgetsGained(new Widget[] {
        expected1,
        expected2
    });
}

Into this:

public void testWidgetProcessor() throws Exception {
    final Widget expected1 = createWidget(), expected2 = createWidget();

    processor.swallow(expected1, expected2);

    assertWidgetsGained(expected1, expected2);
}

And even better:

public void testWidgetProcessorHandlesTrivialCase() throws Exception {
    assertWidgetsGained(); // nothing swallowed, nothing gained
}
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