[JS FIR] Add JsName clash test

^KT-64364

compiler/testData/diagnostics/testsWithJsStdLib/name/companionInheritsOwnerClass.kt

@@ -0,0 +1,15 @@
+// !OPT_IN: kotlin.js.ExperimentalJsExport
+// FIR_IDENTICAL
+@file:JsExport
+
+interface Optional<out T> {
+    @JsName("valueOrThrowException")
+    fun valueOrThrow(exp: Throwable): T
+
+    fun valueOrThrow(): T = valueOrThrow(NoSuchElementException("Optional has no value"))
+}
+
+abstract class None<out T : Any> private constructor() : Optional<T> {
+    companion object : None<Nothing>()
+    override fun valueOrThrow(exp: Throwable): Nothing = throw exp
+}

compiler/testData/diagnostics/testsWithJsStdLib/name/companionInheritsOwnerClass.txt

@@ -0,0 +1,27 @@
+package
+
+public abstract class None</*0*/ out T : kotlin.Any> : Optional<T> {
+    private constructor None</*0*/ out T : kotlin.Any>()
+    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
+    public open override /*1*/ /*fake_override*/ fun valueOrThrow(): T
+    public open override /*1*/ fun valueOrThrow(/*0*/ exp: kotlin.Throwable): kotlin.Nothing
+
+    public companion object Companion : None<kotlin.Nothing> {
+        private constructor Companion()
+        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
+        public open override /*1*/ /*fake_override*/ fun valueOrThrow(): kotlin.Nothing
+        public open override /*1*/ /*fake_override*/ fun valueOrThrow(/*0*/ exp: kotlin.Throwable): kotlin.Nothing
+    }
+}
+
+public interface Optional</*0*/ out T> {
+    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
+    public open fun valueOrThrow(): T
+    @kotlin.js.JsName(name = "valueOrThrowException") public abstract fun valueOrThrow(/*0*/ exp: kotlin.Throwable): T
+}

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirPsiJsOldFrontendDiagnosticsTestGenerated.java

@@ -688,6 +688,12 @@ public class FirPsiJsOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiJ
             runTest("compiler/testData/diagnostics/testsWithJsStdLib/name/classMembers.kt");
         }
 
+        @Test
+        @TestMetadata("companionInheritsOwnerClass.kt")
+        public void testCompanionInheritsOwnerClass() throws Exception {
+            runTest("compiler/testData/diagnostics/testsWithJsStdLib/name/companionInheritsOwnerClass.kt");
+        }
+
         @Test
         @TestMetadata("conflictingNamesFromSuperclass.kt")
         public void testConflictingNamesFromSuperclass() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/DiagnosticsWithJsStdLibTestGenerated.java

@@ -688,6 +688,12 @@ public class DiagnosticsWithJsStdLibTestGenerated extends AbstractDiagnosticsTes
             runTest("compiler/testData/diagnostics/testsWithJsStdLib/name/classMembers.kt");
         }
 
+        @Test
+        @TestMetadata("companionInheritsOwnerClass.kt")
+        public void testCompanionInheritsOwnerClass() throws Exception {
+            runTest("compiler/testData/diagnostics/testsWithJsStdLib/name/companionInheritsOwnerClass.kt");
+        }
+
         @Test
         @TestMetadata("conflictingNamesFromSuperclass.kt")
         public void testConflictingNamesFromSuperclass() throws Exception {