"Find Usages": add tests for Kotlin usages of Java declarations

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodOverrides.0.java

@@ -0,0 +1,14 @@
+// PSI_ELEMENT: com.intellij.psi.PsiMethod
+// OPTIONS: overrides
+public class A {
+    public void <caret>foo() {
+
+    }
+}
+
+public class B extends A {
+    @Override
+    public void foo() {
+
+    }
+}

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodOverrides.1.kt

@@ -0,0 +1,17 @@
+public open class X: A() {
+    public override fun foo() {
+
+    }
+}
+
+public class Y: X() {
+    public override fun foo() {
+
+    }
+}
+
+public class Z: B() {
+    public override fun foo() {
+
+    }
+}

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodOverrides.results.txt

@@ -0,0 +1,4 @@
+Unclassified usage (11: 17) public void foo() {
+Unclassified usage (14: 25) public override fun foo() {
+Unclassified usage (2: 25) public override fun foo() {
+Unclassified usage (8: 25) public override fun foo() {

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodUsages.0.java

@@ -0,0 +1,14 @@
+// PSI_ELEMENT: com.intellij.psi.PsiMethod
+// OPTIONS: usages
+class A {
+    public void <caret>foo() {
+
+    }
+}
+
+class B extends A {
+    @Override
+    public void foo() {
+
+    }
+}

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodUsages.1.kt

@@ -0,0 +1,7 @@
+fun test() {
+    A().foo()
+    B().foo()
+
+    val a = A::foo
+    val b = B::foo
+}

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodUsages.results.txt

@@ -0,0 +1,4 @@
+Callable reference (5: 16) val a = A::foo
+Callable reference (6: 16) val b = B::foo
+Function call (2: 9) A().foo()
+Function call (3: 9) B().foo()