JetDiagnosticsTest migrated to TestGenerator

- test data files renamed from *.jet to *.kt

compiler/testData/diagnostics/tests/scopes/kt900.kt

@@ -0,0 +1,69 @@
+//FILE:a.kt
+//KT-900 Inaccessible class should be unresolved
+
+package a
+
+fun foo() {
+    val <!UNUSED_VARIABLE!>b<!> : <!UNRESOLVED_REFERENCE!>B<!> = <!UNRESOLVED_REFERENCE!>B<!>() //only B() is unresolved, but in ": B" and "B.foo()" B should also be unresolved
+    <!UNRESOLVED_REFERENCE!>B<!>.foo()
+
+    <!UNRESOLVED_REFERENCE!>P<!>.foo()
+
+    <!UNRESOLVED_REFERENCE!>M<!>.bar()
+}
+
+class A() {
+    class object {
+        class B() {
+            class object {
+                fun foo() {}
+            }
+        }
+
+        object P {
+            fun foo() {}
+        }
+    }
+}
+
+object N {
+    object M {
+        fun bar() {}
+    }
+}
+
+//FILE:b.kt
+package b
+
+import b.<!CANNOT_IMPORT_FROM_ELEMENT!>N<!>.M
+import b.A.P
+import b.A.B
+
+fun foo() {
+    val <!UNUSED_VARIABLE!>b<!> : B = B()
+    B.foo()
+
+    P.foo()
+
+    <!UNRESOLVED_REFERENCE!>M<!>.bar()
+}
+
+class A() {
+    class object {
+        class B() {
+            class object {
+                fun foo() {}
+            }
+        }
+
+        object P {
+            fun foo() {}
+        }
+    }
+}
+
+object N {
+    object M {
+        fun bar() {}
+    }
+}