Minor in JS backend: added regression tests.

#{KT-2219, KT-2470, KT-2507, KT-2222, KT-2995, KT-2221} Obsolete

js/js.translator/testData/inheritance/cases/overrideAnyMethods.kt

@@ -0,0 +1,43 @@
+package foo
+
+native
+fun String.charCodeAt(i: Int): Int = noImpl
+
+// Because String in JS doesn't have hashCode method
+fun String.myHashCode(): Int {
+    var hash = 0
+
+    for (i in 0..size - 1) {
+        hash = 31 * hash + charCodeAt(i)
+    }
+
+    return hash
+}
+
+class Foo(val name: String) {
+    override fun equals(other: Any?): Boolean {
+        if (other is Foo) return name == other.name
+        return this identityEquals other
+    }
+    override fun hashCode(): Int = name.myHashCode()
+    override fun toString(): String = "Foo($name)"
+}
+
+fun assertEquals(expected: Any, actual: Any) {
+    if (expected != actual) throw Exception("expected = $expected, actual = $actual")
+}
+
+fun box(): String {
+    val james = Foo("James")
+    val anotherJames = Foo("James")
+    val max = Foo("Max")
+
+    assertEquals(true, james == anotherJames)
+    assertEquals(false, james == max)
+    assertEquals("James".myHashCode(), james.hashCode())
+    assertEquals("Max".myHashCode(), max.hashCode())
+    assertEquals("Foo(James)", james.toString())
+    assertEquals("Foo(Max)", max.toString())
+
+    return "OK"
+}

js/js.translator/testData/inheritance/cases/withInitializeMethod.kt

@@ -0,0 +1,8 @@
+package foo
+
+class A(val ok: String) {
+    fun initialize() = ok
+}
+
+fun box(): String = A("OK").initialize()
+