Add CommonKit and Activity

Signed-off-by: Andy Uhnak <andyuhnak@gmail.com>

CommonKit/Source/Activity/Tests/ActivityCenterTests.swift

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+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import XCTest
+
+class ActivityCenterTests: XCTestCase {
+    var activities: [Activity]!
+    var center: ActivityCenter!
+    
+    override func setUp() {
+        activities = []
+        center = ActivityCenter()
+    }
+    
+    func makeRequest() -> ActivityRequest {
+        return ActivityRequest(
+            presenter: ActivityPresenterSpy(),
+            dismissal: .manual
+        )
+    }
+    
+    func testStartsActivityWhenAdded() {
+        let activity = center.add(makeRequest())
+        XCTAssertEqual(activity.state, .executing)
+    }
+    
+    func testSecondActivityIsPending() {
+        center.add(makeRequest()).store(in: &activities)
+        let activity = center.add(makeRequest())
+        XCTAssertEqual(activity.state, .pending)
+    }
+    
+    func testSecondActivityIsExecutingWhenFirstCompleted() {
+        let first = center.add(makeRequest())
+        let second = center.add(makeRequest())
+        
+        first.cancel()
+        
+        XCTAssertEqual(second.state, .executing)
+    }
+}

CommonKit/Source/Activity/Tests/ActivityPresenterSpy.swift

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+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+class ActivityPresenterSpy: ActivityPresentable {
+    var intel = [String]()
+    
+    func present() {
+        intel.append(#function)
+    }
+    
+    func dismiss() {
+        intel.append(#function)
+    }
+}

CommonKit/Source/Activity/Tests/ActivityTests.swift

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+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+import XCTest
+
+class ActivityTests: XCTestCase {
+    var presenter: ActivityPresenterSpy!
+    
+    override func setUp() {
+        super.setUp()
+        presenter = ActivityPresenterSpy()
+    }
+    
+    func makeActivity(dismissal: ActivityDismissal = .manual, callback: @escaping () -> Void = {}) -> Activity {
+        let request = ActivityRequest(
+            presenter: presenter,
+            dismissal: dismissal
+        )
+        return Activity(
+            request: request,
+            completion: callback
+        )
+    }
+    
+    // MARK: - State
+    
+    func testNewActivityIsPending() {
+        let activity = makeActivity()
+        XCTAssertEqual(activity.state, .pending)
+    }
+    
+    func testStartedActivityIsExecuting() {
+        let activity = makeActivity()
+        activity.start()
+        XCTAssertEqual(activity.state, .executing)
+    }
+    
+    func testCancelledActivityIsCompleted() {
+        let activity = makeActivity()
+        activity.cancel()
+        XCTAssertEqual(activity.state, .completed)
+    }
+    
+    // MARK: - Presenter
+    
+    func testStartingActivityPresentsUI() {
+        let activity = makeActivity()
+        activity.start()
+        XCTAssertEqual(presenter.intel, ["present()"])
+    }
+    
+    func testAllowStartingOnlyOnce() {
+        let activity = makeActivity()
+        activity.start()
+        presenter.intel = []
+        
+        activity.start()
+        
+        XCTAssertEqual(presenter.intel, [])
+    }
+    
+    func testCancellingActivityDismissesUI() {
+        let activity = makeActivity()
+        activity.start()
+        presenter.intel = []
+        
+        activity.cancel()
+        
+        XCTAssertEqual(presenter.intel, ["dismiss()"])
+    }
+    
+    func testAllowCancellingOnlyOnce() {
+        let activity = makeActivity()
+        activity.start()
+        activity.cancel()
+        presenter.intel = []
+        
+        activity.cancel()
+        
+        XCTAssertEqual(presenter.intel, [])
+    }
+    
+    // MARK: - Dismissal
+    
+    func testDismissAfterTimeout() {
+        let interval: TimeInterval = 0.01
+        let activity = makeActivity(dismissal: .timeout(interval))
+        
+        activity.start()
+        
+        let exp = expectation(description: "")
+        DispatchQueue.main.asyncAfter(deadline: .now() + interval) {
+            exp.fulfill()
+        }
+        waitForExpectations(timeout: 1)
+        
+        XCTAssertEqual(activity.state, .completed)
+    }
+    
+    // MARK: - Completion callback
+    
+    func testTriggersCallbackWhenCompleted() {
+        var didComplete = false
+        let activity = makeActivity {
+            didComplete = true
+        }
+        activity.start()
+        
+        activity.cancel()
+        
+        XCTAssertTrue(didComplete)
+    }
+}