[JS BE] add tests for es6-classes

js/js.translator/testData/box/es6classes/defaultPrimaryExtendsAny.kt

@@ -0,0 +1,32 @@
+// EXPECTED_REACHABLE_NODES: 1347
+var sideEffect = ""
+
+abstract class A {
+    fun print(a: Any) { sideEffect += "#$a" }
+
+    constructor(x: Int, y: Int) {
+        print(x + y)
+        print(foo())
+    }
+
+    abstract fun foo(): String
+
+    init {
+        print("init: " + foo())
+    }
+}
+
+class O(val x: String) {
+    inner class I() : A(13, 37) {
+        override fun foo() = x
+    }
+}
+
+fun box(): String {
+    val o = O("OK")
+    val i = o.I()
+
+    assertEquals("#init: OK#50#OK", sideEffect)
+
+    return i.foo()
+}