Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/WatchConnectivity/Tests/TestWatchConnectivity.swift

@@ -0,0 +1,52 @@
+import PMKWatchConnectivity
+import WatchConnectivity
+import PromiseKit
+import XCTest
+
+class WatchConnectivityTests: XCTestCase {
+    class MockSession: WCSession {
+
+        var fail = false
+
+        override func sendMessage(_ message: [String : Any], replyHandler: (([String : Any]) -> Void)?, errorHandler: ((Error) -> Void)?) {
+            if fail {
+                errorHandler?(NSError(domain: "Test", code: 1, userInfo: [:]))
+            } else {
+                replyHandler?(["response": "Success"])
+            }
+        }
+    }
+
+    func testSuccess() {
+
+        let ex = expectation(description: "Success callback")
+        let session = MockSession.default as! MockSession
+        session.fail = false
+        session.sendMessage(["message": "test"]).done { response in
+            XCTAssertEqual(response as! [String: String], ["response": "Success"])
+            ex.fulfill()
+        }.catch { _ in
+            XCTFail("Should not fail")
+        }
+        waitForExpectations(timeout: 1, handler: nil)
+    }
+
+    func testFailure() {
+        class MockFailSession: WCSession {
+             override func sendMessage(_ message: [String : Any], replyHandler: (([String : Any]) -> Void)?, errorHandler: ((Error) -> Void)?) {
+                errorHandler?(NSError(domain: "Test", code: 1, userInfo: [:]))
+            }
+        }
+
+        let ex = expectation(description: "Error callback")
+        let session = MockSession.default as! MockSession
+        session.fail = true
+        session.sendMessage(["message": "test"]).done { response in
+            XCTFail("Should not succeed")
+        }.catch { error in
+            XCTAssertEqual((error as NSError).domain, "Test")
+            ex.fulfill()
+        }
+        waitForExpectations(timeout: 1, handler: nil)
+    }
+}