add traceur test suite

test/fixtures/traceur/Classes/MethodInheritance.js

@@ -0,0 +1,32 @@
+class MethodsA {
+  ma() {}
+}
+
+class MethodsB extends MethodsA {
+  mb() {}
+}
+
+class MethodsC extends MethodsB {
+  mc() {}
+}
+
+// ----------------------------------------------------------------------------
+
+var a = new MethodsA();
+var b = new MethodsB();
+var c = new MethodsC();
+
+var pa = Object.getPrototypeOf(a);
+var pb = Object.getPrototypeOf(b);
+var pc = Object.getPrototypeOf(c);
+
+assertNoOwnProperties(a);
+assertNoOwnProperties(b);
+assertNoOwnProperties(c);
+
+assertHasOwnProperty(pa, 'ma');
+assertLacksOwnProperty(pa, 'mb', 'mc');
+assertHasOwnProperty(pb, 'mb');
+assertLacksOwnProperty(pb, 'ma', 'mc');
+assertHasOwnProperty(pc, 'mc');
+assertLacksOwnProperty(pc, 'ma', 'mb');