Mockito provides _argument matchers_  and _argument captors_ for flexibly stubbing or verifying method calls.


``++Mockito.verify()++``, ``++Mockito.when()++``, ``++Stubber.when()++`` and ``++BDDMockito.given()++`` each have overloads with and without argument matchers.


However, if argument matchers or captors are used only on some of the parameters, all the parameters need to have matchers as well, otherwise an ``++InvalidUseOfMatchersException++`` will be thrown. 


This rule consequently raises an issue every time matchers are not used on all the parameters of a stubbed/verified method.


== Noncompliant Code Example

----
@Test
public void myTest() {
  given(foo.bar(anyInt(), i1, i2)).willReturn(null); // Noncompliant
  when(foo.baz(eq(val1), val2)).thenReturn("hi"); // Noncompliant
  doThrow(new RuntimeException()).when(foo).quux(intThat(x -> x >= 42), -1); // Noncompliant
  verify(foo).bar(i1, anyInt(), i2); // Noncompliant
  ArgumentCaptor<Integer> captor = ArgumentCaptor.forClass(Integer.class);
  verify(foo).bar(captor.capture(), i1, any()); // Noncompliant
}
----


== Compliant Solution

----
@Test
public void myTest() {
  given(foo.bar(anyInt(), eq(i1), eq(i2))).willReturn(null);
  when(foo.baz(val1, val2)).thenReturn("hi");
  doThrow(new RuntimeException()).when(foo).quux(intThat(x -> x >= 42), eq(-1));
  verify(foo).bar(eq(i1), anyInt(), eq(i2));
  ArgumentCaptor<Integer> captor = ArgumentCaptor.forClass(Integer.class);
  verify(foo).bar(captor.capture(), any(), any());
}
----


== See

* https://javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/Mockito.html#argument_matchers[Mockito documentation] - argument matchers
* S6068 - Call to Mockito method "verify", "when" or "given" should be simplified


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