A comprehensive guide to Mockito argument matchers covering built-in matchers like any(), eq(), anyString(), anyInt(), and anyList(), the all-or-nothing consistency rule that prevents InvalidUseOfMatchersException, ArgumentCaptor for post-call inspection, custom ArgumentMatcher implementations via argThat(), and AdditionalMatchers for numeric comparisons. Uses Mockito 5.14.2 with JUnit Jupiter 5.10.2, includes code examples, comparison tables, and common pitfalls.
Table of contents
Key takeawaysPrerequisitesWhat are Mockito argument matchers?The argument matcher consistency ruleBuilt-in argument matchers in MockitoUsing argument matchers with when() for stubbingUsing argument matchers with verify() for behavior verificationCapturing arguments with ArgumentCaptorWriting a custom ArgumentMatcherMockito AdditionalMatchersCommon mistakes and how to avoid themMockito argument matchers vs Hamcrest matchersChoosing the right tool for the job?FAQsConclusionSort: