Default answer of every Mockito mock.
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Returns appropriate primitive for primitive-returning methods
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Returns consistent values for primitive wrapper classes (e.g. int-returning method retuns 0 and Integer-returning method returns 0, too)
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Returns empty collection for collection-returning methods (works for most commonly used collection types)
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Returns description of mock for toString() method
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Returns zero if references are equals otherwise non-zero for Comparable#compareTo(T other) method (see issue 184)
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Returns null for everything else