diff --git a/compiler/testData/diagnostics/tests/classObjects/ClassObjects.kt b/compiler/testData/diagnostics/tests/classObjects/ClassObjects.kt
index d25561e9fdc..f5ade42c2bb 100644
--- a/compiler/testData/diagnostics/tests/classObjects/ClassObjects.kt
+++ b/compiler/testData/diagnostics/tests/classObjects/ClassObjects.kt
@@ -1,10 +1,22 @@
 package Jet86
 
 class A {
+  <!REDECLARATION!>class object<!> {
+    val x = 1
+  }
+  <!MANY_CLASS_OBJECTS, REDECLARATION!>class object<!> {
+    val x = 1
+  }
+}
+
+class AA {
   class object {
     val x = 1
   }
-  <!MANY_CLASS_OBJECTS!>class object<!> { // error
+  <!MANY_CLASS_OBJECTS!>class object A<!> {
+    val x = 1
+  }
+    <!MANY_CLASS_OBJECTS!>class object AA<!> {
     val x = 1
   }
 }
diff --git a/compiler/testData/diagnostics/tests/classObjects/ClassObjects.txt b/compiler/testData/diagnostics/tests/classObjects/ClassObjects.txt
index 6d17b4bec66..26362f14acc 100644
--- a/compiler/testData/diagnostics/tests/classObjects/ClassObjects.txt
+++ b/compiler/testData/diagnostics/tests/classObjects/ClassObjects.txt
@@ -30,6 +30,37 @@ package Jet86 {
         }
     }
 
+    internal final class AA {
+        public constructor AA()
+        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+
+        internal class object A {
+            private constructor A()
+            internal final val x: kotlin.Int = 1
+            public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+            public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+            public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+        }
+
+        internal class object AA {
+            private constructor AA()
+            internal final val x: kotlin.Int = 1
+            public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+            public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+            public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+        }
+
+        internal class object Default {
+            private constructor Default()
+            internal final val x: kotlin.Int = 1
+            public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+            public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+            public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+        }
+    }
+
     internal final class B {
         public constructor B()
         internal final val x: kotlin.Int = 12