Add test for decompiled text

idea/testData/libraries/decompiledText/NestedClasses.expected.kt

@@ -0,0 +1,28 @@
+// IntelliJ API Decompiler stub source generated from a class file
+// Implementation of methods is not available
+
+package test
+
+internal final class NestedClasses() {
+    internal final fun f(): kotlin.Unit { /* compiled code */ }
+
+    public final inner class Inner() {
+        internal final fun f(): kotlin.Unit { /* compiled code */ }
+
+        private final inner class II() {
+            internal final fun f(): kotlin.Unit { /* compiled code */ }
+        }
+    }
+
+    private final class Nested() {
+        internal final fun f(): kotlin.Unit { /* compiled code */ }
+
+        internal final inner class NI() {
+            internal final fun f(): kotlin.Unit { /* compiled code */ }
+        }
+
+        public final class NN() {
+            internal final fun f(): kotlin.Unit { /* compiled code */ }
+        }
+    }
+}