add tests for serializaion of nested classes and objects (builtins and js)

compiler/testData/serialization/builtinsSerializer/nestedClassesAndObjects.kt

@@ -0,0 +1,40 @@
+package test
+
+class ClassA {
+    class classB {
+        fun memberFromB(): Int = 100
+
+        class BC {
+            val memberFromBB: Int = 150
+        }
+
+        object BO {
+            val memberFromBO: Int = 175
+        }
+    }
+
+    inner class classC {
+        val memberFromC: Int = 200
+
+        class CC {
+            val memberFromCC: Int = 250
+        }
+
+        object CO {
+            val memberFromCO: Int = 265
+        }
+    }
+
+    companion object {
+        val stat: Int
+
+        class D {
+            val memberFromD: Int = 275
+        }
+    }
+
+    object ObjA {
+        val memberFromObjA: Int = 300
+    }
+}
+

compiler/testData/serialization/builtinsSerializer/nestedClassesAndObjects.txt

@@ -0,0 +1,50 @@
+package test
+
+internal final class ClassA {
+    public constructor ClassA()
+
+    internal companion object Companion {
+        private constructor Companion()
+        internal final val stat: kotlin.Int
+
+        internal final class D {
+            public constructor D()
+            internal final val memberFromD: kotlin.Int = 275
+        }
+    }
+
+    internal object ObjA {
+        private constructor ObjA()
+        internal final val memberFromObjA: kotlin.Int = 300
+    }
+
+    internal final class classB {
+        public constructor classB()
+        internal final fun memberFromB(): kotlin.Int
+
+        internal final class BC {
+            public constructor BC()
+            internal final val memberFromBB: kotlin.Int = 150
+        }
+
+        internal object BO {
+            private constructor BO()
+            internal final val memberFromBO: kotlin.Int = 175
+        }
+    }
+
+    internal final inner class classC {
+        public constructor classC()
+        internal final val memberFromC: kotlin.Int = 200
+
+        internal final class CC {
+            public constructor CC()
+            internal final val memberFromCC: kotlin.Int = 250
+        }
+
+        internal object CO {
+            private constructor CO()
+            internal final val memberFromCO: kotlin.Int = 265
+        }
+    }
+}

compiler/tests/org/jetbrains/kotlin/serialization/builtins/BuiltInsSerializerTest.kt

@@ -64,6 +64,10 @@ public class BuiltInsSerializerTest : TestCaseWithTmpdir() {
         doTest("simple.kt")
     }
 
+    fun testNestedClassesAndObjects() {
+        doTest("nestedClassesAndObjects.kt")
+    }
+
     fun testCompileTimeConstants() {
         doTest("compileTimeConstants.kt")
     }

compiler/tests/org/jetbrains/kotlin/serialization/js/KotlinJavascriptSerializerTest.kt

@@ -101,6 +101,10 @@ public class KotlinJavascriptSerializerTest : TestCaseWithTmpdir() {
         doTest("builtinsSerializer/simple.kt")
     }
 
+    fun testNestedClassesAndObjects() {
+        doTest("builtinsSerializer/nestedClassesAndObjects.kt")
+    }
+
     fun testCompileTimeConstants() {
         doTest("builtinsSerializer/compileTimeConstants.kt")
     }