j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/newClassExpression/newAnonymousClass3.java

@@ -0,0 +1,27 @@
+//file
+import kotlinApi.KotlinTrait;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+class C {
+    void foo() {
+        KotlinTrait t = new KotlinTrait() {
+            @Nullable
+            @Override
+            public String nullableFun() {
+                return null;
+            }
+
+            @NotNull
+            @Override
+            public String notNullableFun() {
+                return "";
+            }
+
+            @Override
+            public int nonAbstractFun() {
+                return 0;
+            }
+        };
+    }
+}