[NT-885] Landing page optimizely events

Kickstarter-iOS/ViewModels/AppDelegateViewModel.swift

@@ -637,6 +637,25 @@ public final class AppDelegateViewModel: AppDelegateViewModelType, AppDelegateVi
     deepLinkFromNotification
       .observeValues { _ in AppEnvironment.current.koala.trackNotificationOpened() }
 
+    // Optimizely tracking
+
+    self.applicationDidEnterBackgroundProperty.signal
+      .observeValues {
+        let (properties, eventTags) = optimizelyTrackingAttributesAndEventTags(
+          with: AppEnvironment.current.currentUser,
+          project: nil,
+          refTag: nil
+        )
+
+        try? AppEnvironment.current.optimizelyClient?
+          .track(
+            eventKey: "App Closed",
+            userId: deviceIdentifier(uuid: UUID()),
+            attributes: properties,
+            eventTags: eventTags
+          )
+      }
+
     self.applicationIconBadgeNumber = Signal.merge(
       self.applicationWillEnterForegroundProperty.signal,
       self.applicationLaunchOptionsProperty.signal.ignoreValues()

Kickstarter-iOS/ViewModels/AppDelegateViewModelTests.swift

@@ -253,6 +253,14 @@ final class AppDelegateViewModelTests: TestCase {
     }
   }
 
+  func testOptimizelyTracking() {
+    XCTAssertEqual(self.optimizelyClient.trackedEventKey, nil)
+
+    self.vm.inputs.applicationDidEnterBackground()
+
+    XCTAssertEqual(self.optimizelyClient.trackedEventKey, "App Closed")
+  }
+
   // MARK: - AppCenter
 
   func testConfigureAppCenter_AlphaApp_LoggedOut() {

Library/OptimizelyClientType.swift

@@ -40,16 +40,16 @@ extension OptimizelyClientType {
 
 public func optimizelyTrackingAttributesAndEventTags(
   with user: User?,
-  project: Project,
+  project: Project?,
   refTag: RefTag?
 ) -> ([String: Any], [String: Any]) {
   let properties = optimizelyUserAttributes(with: user, project: project, refTag: refTag)
 
   let eventTags: [String: Any] = ([
-    "project_subcategory": project.category.name,
-    "project_category": project.category.parentName,
-    "project_country": project.location.country.lowercased(),
-    "project_user_has_watched": project.personalization.isStarred
+    "project_subcategory": project?.category.name,
+    "project_category": project?.category.parentName,
+    "project_country": project?.location.country.lowercased(),
+    "project_user_has_watched": project?.personalization.isStarred
   ] as [String: Any?]).compact()
 
   return (properties, eventTags)

Library/ViewModels/LandingPageViewModel.swift

@@ -33,6 +33,25 @@ public final class LandingPageViewModel: LandingPageViewModelType, LandingPageVi
       .observeValues { _ in
         AppEnvironment.current.userDefaults.hasSeenLandingPage = true
       }
+
+    // Tracking
+
+    self.ctaButtonTappedSignal
+      .observeValues {
+        let (properties, eventTags) = optimizelyTrackingAttributesAndEventTags(
+          with: AppEnvironment.current.currentUser,
+          project: nil,
+          refTag: nil
+        )
+
+        try? AppEnvironment.current.optimizelyClient?
+          .track(
+            eventKey: "Get Started Button Clicked",
+            userId: deviceIdentifier(uuid: UUID()),
+            attributes: properties,
+            eventTags: eventTags
+          )
+      }
   }
 
   private let (ctaButtonTappedSignal, ctaButtonTappedObserver) = Signal<(), Never>.pipe()

Library/ViewModels/LandingPageViewModelTests.swift

@@ -27,6 +27,14 @@ internal final class LandingPageViewModelTests: TestCase {
     self.dismissViewController.assertValueCount(1)
   }
 
+  func testoptimizelyTracking_OnButtonTap() {
+    XCTAssertEqual(self.optimizelyClient.trackedEventKey, nil)
+
+    self.viewModel.inputs.ctaButtonTapped()
+
+    XCTAssertEqual(self.optimizelyClient.trackedEventKey, "Get Started Button Clicked")
+  }
+
   func testUserDefaultsUpdates_OnViewDidLoad() {
     let userDefaults = MockKeyValueStore()