A little tip about Java generics

A small tip about Java generics

Use ArgumentCaptor to capture the parameters in the mock method as shown below

ArgumentCaptor<List<Foo>> fooCaptor = ArgumentCaptor.forClass(List.class);

Error reporting

Error:(89, 86) java: incompatible types: org.mockito.ArgumentCaptor<java.util.List> cannot be converted to org.mockito.ArgumentCaptor<java.util.List<com.myapp.model.Foo>>

Solution

Using a higher version of Mockito--mockito-core-2.0.36-beta

Code comparison

mockito-core-1.0.19

public static <T> ArgumentCaptor<T> forClass(Class<T> clazz) {
    return new ArgumentCaptor<T>(clazz);
}

mockito-core-2.0.36-beta

public static <U,S extends U> ArgumentCaptor<U> forClass(Class<S> clazz) {
    return new ArgumentCaptor<U>(clazz);
}