Add tests for accessing to Java/Kotlin inner/nested classes

compiler/testData/diagnostics/tests/inner/accessingToKotlinNestedClass.kt

@@ -0,0 +1,44 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+open class A {
+    class NC {}
+    inner class IC {}
+    interface NI {}
+}
+
+interface I {
+    class NC {}
+    interface NI {}
+}
+
+class B : A() {
+
+}
+
+class C : I {
+
+}
+
+class D : A(), I {
+
+}
+
+fun test() {
+    val ac: A.NC = A.NC()
+    val aic: A.IC = A().IC()
+    val ai: A.NI? = null
+
+    val ic: I.NC = I.NC()
+    val ii: I.NI? = null
+
+    val bc: B.<!UNRESOLVED_REFERENCE!>NC<!> = B.<!UNRESOLVED_REFERENCE!>NC<!>()
+    val bic: B.<!UNRESOLVED_REFERENCE!>IC<!> = B().<!UNRESOLVED_REFERENCE!>IC<!>()
+    val bi: B.<!UNRESOLVED_REFERENCE!>NI<!>? = null
+
+    val cc: C.<!UNRESOLVED_REFERENCE!>NC<!> = C.<!UNRESOLVED_REFERENCE!>NC<!>()
+    val ci: C.<!UNRESOLVED_REFERENCE!>NI<!>? = null
+
+    val dc: D.<!UNRESOLVED_REFERENCE!>NC<!> = D.<!UNRESOLVED_REFERENCE!>NC<!>()
+    val dic: D.<!UNRESOLVED_REFERENCE!>IC<!> = D().<!UNRESOLVED_REFERENCE!>IC<!>()
+    val di: D.<!UNRESOLVED_REFERENCE!>NI<!>? = null
+}