JVM: add tests for companion object accessor generation

compiler/testData/codegen/bytecodeText/companion/protectedCompanionObjectAccessors_after.kt

@@ -0,0 +1,22 @@
+// !LANGUAGE: +ProperVisibilityForCompanionObjectInstanceField
+// IGNORE_BACKEND: JVM_IR
+// ^ TODO implement ProperVisibilityForCompanionObjectInstanceField feature support in JMV_IR
+
+// FILE: Base.kt
+package a
+
+open class Base {
+    protected companion object {
+        fun foo() = 1
+    }
+}
+
+// FILE: Host.kt
+import a.*
+
+class Host : Base() {
+    fun test() = { foo() }
+}
+
+// @Host.class:
+// 1 synthetic access\$

compiler/testData/codegen/bytecodeText/companion/protectedCompanionObjectAccessors_before.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: -ProperVisibilityForCompanionObjectInstanceField
+
+// FILE: Base.kt
+package a
+
+open class Base {
+    protected companion object {
+        fun foo() = 1
+    }
+}
+
+// FILE: Host.kt
+import a.*
+
+class Host : Base() {
+    fun test() = { foo() }
+}
+
+// @Host.class:
+// 0 synthetic access\$

compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java

@@ -930,6 +930,16 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
         public void testPrivateCompanionObjectAccessors_before() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/companion/privateCompanionObjectAccessors_before.kt");
         }
+
+        @TestMetadata("protectedCompanionObjectAccessors_after.kt")
+        public void testProtectedCompanionObjectAccessors_after() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/companion/protectedCompanionObjectAccessors_after.kt");
+        }
+
+        @TestMetadata("protectedCompanionObjectAccessors_before.kt")
+        public void testProtectedCompanionObjectAccessors_before() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/companion/protectedCompanionObjectAccessors_before.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/conditions")

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBytecodeTextTestGenerated.java

@@ -930,6 +930,16 @@ public class IrBytecodeTextTestGenerated extends AbstractIrBytecodeTextTest {
         public void testPrivateCompanionObjectAccessors_before() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/companion/privateCompanionObjectAccessors_before.kt");
         }
+
+        @TestMetadata("protectedCompanionObjectAccessors_after.kt")
+        public void testProtectedCompanionObjectAccessors_after() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/companion/protectedCompanionObjectAccessors_after.kt");
+        }
+
+        @TestMetadata("protectedCompanionObjectAccessors_before.kt")
+        public void testProtectedCompanionObjectAccessors_before() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/companion/protectedCompanionObjectAccessors_before.kt");
+        }
     }
 
     @TestMetadata("compiler/testData/codegen/bytecodeText/conditions")