Add PromiseKit dependency

- Added PromiseKit dependency

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

@@ -0,0 +1,16 @@
+import XCTest
+
+class UITest_SLComposeViewController_Swift: PMKiOSUITestCase {
+    func test_can_cancel() {
+        let app = XCUIApplication()
+        app.tables.staticTexts["5"].tap()
+
+        sleep(5) // takes longer than usual
+
+        app.alerts.buttons["Cancel"].tap()
+
+        sleep(3)  // takes longer than usual (this may only pass when you look at it)
+
+        XCTAssertTrue(value)
+    }
+}