Dactyloidae iOS initial commit

mobile/ios/ClientTests/TabEventHandlerTests.swift

@@ -0,0 +1,87 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+@testable import Client
+import WebKit
+
+import XCTest
+
+class TabEventHandlerTests: XCTestCase {
+
+    func testEventDelivery() {
+        let tab = Tab(configuration: WKWebViewConfiguration())
+        let handler = DummyHandler()
+
+        XCTAssertNil(handler.isFocused)
+
+        TabEvent.post(.didGainFocus, for: tab)
+        XCTAssertTrue(handler.isFocused!)
+
+        TabEvent.post(.didLoseFocus, for: tab)
+        XCTAssertFalse(handler.isFocused!)
+    }
+
+    func testUnregistration() {
+        let tab = Tab(configuration: WKWebViewConfiguration())
+        let handler = DummyHandler()
+
+        XCTAssertNil(handler.isFocused)
+
+        TabEvent.post(.didGainFocus, for: tab)
+        XCTAssertTrue(handler.isFocused!)
+
+        handler.doUnregister()
+        TabEvent.post(.didLoseFocus, for: tab)
+        // The event didn't reach us, so we should still be focused.
+        XCTAssertTrue(handler.isFocused!)
+    }
+
+    func testOnlyRegisteredForEvents() {
+        let tab = Tab(configuration: WKWebViewConfiguration())
+        let handler = DummyHandler()
+        handler.doUnregister()
+
+        let tabObservers = handler.registerFor(.didGainFocus)
+
+        XCTAssertNil(handler.isFocused)
+
+        TabEvent.post(.didGainFocus, for: tab)
+        XCTAssertTrue(handler.isFocused!)
+
+        TabEvent.post(.didLoseFocus, for: tab)
+        XCTAssertTrue(handler.isFocused!)
+
+        handler.unregister(tabObservers)
+    }
+}
+
+
+class DummyHandler: TabEventHandler {
+    var tabObservers: TabObservers!
+
+    // This is not how this should be written in production — the handler shouldn't be keeping track
+    // of individual tab state.
+    var isFocused: Bool? = nil
+
+    init() {
+        tabObservers = registerFor(.didGainFocus, .didLoseFocus)
+    }
+
+    deinit {
+        doUnregister()
+    }
+
+    fileprivate func doUnregister() {
+        unregister(tabObservers)
+    }
+
+    func tabDidGainFocus(_ tab: Tab) {
+        isFocused = true
+    }
+
+    func tabDidLoseFocus(_ tab: Tab) {
+        isFocused = false
+    }
+}