Test for KT-5969: Codegen overrides all java 8 default methods with delegation to unexisting Timpl

#KT-5969 Fixed

compiler/java8-tests/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxWithJava8CodegenTestGenerated.java

@@ -47,6 +47,12 @@ public class BlackBoxWithJava8CodegenTestGenerated extends AbstractBlackBoxCodeg
         doTestWithJava(fileName);
     }
 
+    @TestMetadata("dontDelegateToDefaultMethods")
+    public void testDontDelegateToDefaultMethods() throws Exception {
+        String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/java8/boxWithJava/dontDelegateToDefaultMethods/");
+        doTestWithJava(fileName);
+    }
+
     @TestMetadata("samOnInterfaceWithDefaultMethod")
     public void testSamOnInterfaceWithDefaultMethod() throws Exception {
         String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/java8/boxWithJava/samOnInterfaceWithDefaultMethod/");

compiler/testData/codegen/java8/boxWithJava/dontDelegateToDefaultMethods/Test.java

@@ -0,0 +1,8 @@
+interface Test<T> {
+
+    T call();
+
+    default T testDefault(T p) {
+        return p;
+    }
+}

compiler/testData/codegen/java8/boxWithJava/dontDelegateToDefaultMethods/delegation.kt

@@ -0,0 +1,11 @@
+class Child : Test<String> {
+    override fun call() : String {
+        return "OK"
+    }
+}
+fun box(): String {
+    val res = Child().call()
+    if (res != "OK") return "fail $res"
+
+    return Child().testDefault("OK")
+}