testdata for IDEA-154861

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/redundantCast/IDEA154861.java

@@ -0,0 +1,36 @@
+import java.util.Set;
+
+class Test
+{
+
+  @SuppressWarnings("unchecked")
+  public void someMethod(final Set<String> set)
+  {
+    when(set)
+      .thenAnswer(invocationOnMock -> union(set, (Set<String>) invocationOnMock.getArguments()[0]));
+  }
+
+
+  static <T> OngoingStubbing<T> when(T methodCall)
+  {
+    return answer -> null;
+  }
+
+  interface OngoingStubbing<T>
+  {
+    OngoingStubbing<T> thenAnswer(Answer<?> answer);
+  }
+
+  interface Answer<T> {
+    T answer(InvocationOnMock invocation) throws Throwable;
+  }
+
+  interface InvocationOnMock
+  {
+    Object[] getArguments();
+  }
+
+  static <E> Set<E> union(final Set<? extends E> set1, final Set<? extends E> set2) {
+    return null;
+  }
+}