JS backend: added test which check that name of classes not mangled when we have a function with the same name in non-public API

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/FunctionTest.java

@@ -154,4 +154,8 @@ public class FunctionTest extends AbstractExpressionTest {
     public void testLambdaOrLocalFunInsideEnumMethod() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testManglingClashFunctionsAndClasses() throws Exception {
+        checkFooBoxIsOk();
+    }
 }

js/js.translator/testData/expression/function/cases/manglingClashFunctionsAndClasses.kt

@@ -0,0 +1,45 @@
+package foo
+
+public class A
+
+fun A(a: Int){}
+
+public class B(a: Int)
+
+fun B(){}
+
+fun C(a: Int){}
+
+public class C
+
+fun D(){}
+
+public class D(a: Int)
+
+//Testing
+
+fun testClass(name: String, f: () -> Unit) {
+    val fs = f.toString()
+
+    if ("$name(" !in fs) throw Exception("Name of class '$name' unexpectedly mangled: $fs")
+}
+
+fun testFun(name: String, f: () -> Unit) {
+    val fs = f.toString()
+
+    if ("$name(" in fs) throw Exception("Name of fun '$name' unexpectedly not mangled: $fs")
+}
+
+
+fun box(): String {
+    testClass("A") { A() }
+    testFun("A") { A(1) }
+    testFun("B") { B() }
+    testClass("B") { B(1) }
+    testClass("C") { C() }
+    testFun("C") { C(1) }
+    testFun("D") { D() }
+    testClass("D") { D(1) }
+
+    return "OK"
+}