Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/Social/Tests/TestSocial.swift

@@ -0,0 +1,56 @@
+import PromiseKit
+import PMKSocial
+import Social
+import XCTest
+
+class SLRequestTests: XCTestCase {
+    func testSLRequest() {
+        // I tried to just override SLRequest, but Swift wouldn't let me
+        // then use the long initializer, and an exception is thrown inside
+        // init()
+
+        swizzle(SLRequest.self, #selector(SLRequest.perform(handler:))) {
+            let url = URL(string: "https://api.twitter.com/1.1/statuses/user_timeline.json")
+            let params = ["foo": "bar"]
+            let rq = SLRequest(forServiceType: SLServiceTypeTwitter, requestMethod: .GET, url: url, parameters: params)!
+
+            let ex = expectation(description: "")
+            rq.perform().done {
+                XCTAssertEqual($0.data, Data())
+                ex.fulfill()
+            }.catch {
+                XCTFail("\($0)")
+            }
+            waitForExpectations(timeout: 1, handler: nil)
+        }
+    }
+}
+
+extension SLRequest {
+    @objc private func pmk_performRequestWithHandler(_ handler: @escaping SLRequestHandler) {
+        after(seconds: 0).done { _ in
+            let rsp = HTTPURLResponse(url: URL(string: "http://example.com")!, statusCode: 200, httpVersion: "2.0", headerFields: [:])
+            handler(Data(), rsp, nil)
+        }
+    }
+}
+
+
+import ObjectiveC
+
+func swizzle(_ foo: AnyClass, _ from: Selector, isClassMethod: Bool = false, body: () -> Void) {
+    let originalMethod: Method!
+    let swizzledMethod: Method!
+
+    if isClassMethod {
+        originalMethod = class_getClassMethod(foo, from)
+        swizzledMethod = class_getClassMethod(foo, Selector("pmk_\(from)"))
+    } else {
+        originalMethod = class_getInstanceMethod(foo, from)
+        swizzledMethod = class_getInstanceMethod(foo, Selector("pmk_\(from)"))
+    }
+
+    method_exchangeImplementations(originalMethod, swizzledMethod)
+    body()
+    method_exchangeImplementations(swizzledMethod, originalMethod)
+}