Add aliasing test

tests/cases/fourslash/codeFixClassImplementInterfaceMemberTypeAlias.ts

@@ -0,0 +1,12 @@
+/// <reference path='fourslash.ts' />
+
+//// type MyType = [string, number];
+//// interface I { test(a: MyType): void; }
+//// class C implements I {[| |]}
+
+verify.rangeAfterCodeFix(`
+    test(a: MyType): void {
+        throw new Error("Method not implemented.");
+    }
+`);
+