Add tests

Author: iMostfa

test/refactoring/CopyObjCSelector/basic.swift

@@ -0,0 +1,24 @@
+import Foundation
+
+class MyClass: NSObject {
+    @objc func simpleMethod() {
+        print("simple")
+    }
+
+    @objc func methodWithParameters(param1: Int, param2: String) {
+        print("params")
+    }
+
+    @objc(customSelector:with:)
+    func methodWithCustomSelector(foo: Int, bar: String) {
+        print("custom")
+    }
+}
+
+// RUN: %refactor -source-filename %s -pos=4:16 | %FileCheck %s -check-prefix=CHECK-SIMPLE
+// RUN: %refactor -source-filename %s -pos=8:16 | %FileCheck %s -check-prefix=CHECK-PARAMS
+// RUN: %refactor -source-filename %s -pos=13:10 | %FileCheck %s -check-prefix=CHECK-CUSTOM
+
+// CHECK-SIMPLE: Copy Objective-C Selector
+// CHECK-PARAMS: Copy Objective-C Selector
+// CHECK-CUSTOM: Copy Objective-C Selector