[mockito-match-list] match list param (#18360)

* [mockito-match-list] match list param

* [mockito-match-list] formatting

Author: sk1418

testing-modules/mockito-4/src/test/java/com/baeldung/genericlist/MatchGenericListUnitTest.java

@@ -0,0 +1,55 @@
+package com.baeldung.genericlist;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyList;
+import static org.mockito.Mockito.when;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentMatchers;
+import org.mockito.Mockito;
+
+interface MyInterface {
+
+    default String extractFirstLetters(List<String> words) {
+        return String.join(", ", words.stream()
+            .map(str -> str.substring(0, 1))
+            .toList());
+    }
+}
+
+public class MatchGenericListUnitTest {
+
+    @Test
+    void whenUseAnyWithListClass_thenCorrect() {
+        MyInterface mock = Mockito.mock(MyInterface.class);
+        when(mock.extractFirstLetters(any(List.class))).thenReturn("a, b, c, d, e");
+        assertEquals("a, b, c, d, e", mock.extractFirstLetters(new ArrayList<>()));
+    }
+
+    @Test
+    void whenUseAnyListWithTypeParameterInJava7_thenCorrect() {
+        //Java 7
+        MyInterface mock = Mockito.mock(MyInterface.class);
+        when(mock.extractFirstLetters(ArgumentMatchers.<String> anyList())).thenReturn("a, b, c, d, e");
+        assertEquals("a, b, c, d, e", mock.extractFirstLetters(new ArrayList<>()));
+    }
+
+    @Test
+    void whenUseAnyList_thenCorrect() {
+        MyInterface mock = Mockito.mock(MyInterface.class);
+        when(mock.extractFirstLetters(anyList())).thenReturn("a, b, c, d, e");
+        assertEquals("a, b, c, d, e", mock.extractFirstLetters(new ArrayList<>()));
+    }
+
+    @Test
+    void whenUseAny_thenCorrect() {
+        MyInterface mock = Mockito.mock(MyInterface.class);
+        when(mock.extractFirstLetters(any())).thenReturn("a, b, c, d, e");
+        assertEquals("a, b, c, d, e", mock.extractFirstLetters(new ArrayList<>()));
+    }
+
+}