Screenshot tests (#130)

* #9 Add snapshot testing library

* #9 Create script to boot test simulators

* #9 Create the UI test plan

* #9 Create shared schemes for test targets

* #9 Disable split view for UI tests

* #9 Fix fastlane dependencies

* #9 Add snapshot testing to the application

* #9 assert screenshots

* #9 fix swipe gestures on iPad

* #9 Fix accessing items in session verification screen

* #9 Workaround for flaky unit test

* #9 Specify scheme for alpha build

* #9 Add reference screenshots

* Update python script path and check assets for png check

* Update script path

* Use static timezone for simulator time

* Fix build after SwiftFormat

* Add changelog

* Upload failed screenshots artifact

* Always upload artifacts

* Update boot simulator script

* Update simulator overridden time

* Install pytz before tests

* Get time from Ruby script

* Disable SwiftUI animation when running UI tests

* Update screenshots after animation setting

* Include reference images in the artifact

* Update matching precision

* Update image matching precision & revert artifact content

* Include Xcode result in the artifact

* Update test output directory

* Disable gradient on splash screen for tests

* Tap next button explicitly

* Wait a bit before checking alert

* Wait 1 second

* Run SwiftFormat on project

* Ignore temporary screenshots

* Fix most of the PR remarks

* Fix conflicts

* Bump Python version to 3

* Update reference screenshots for authentication screens

* Update SwiftFormat

* Fix flakey session verification test.

* Update scheme.

Co-authored-by: Doug <douglase@element.io>

UITests/SupportingFiles/target.yml

@@ -1,5 +1,25 @@
 name: UITests
 
+schemes:
+  UITests:
+    analyze:
+      config: Debug
+    archive:
+      config: Release
+    build:
+      targets:
+        UITests: all
+    profile:
+      config: Release
+    run:
+      config: Debug
+      disableMainThreadChecker: false
+    test:
+      config: Debug
+      testPlans:
+        - path: UITests.xctestplan
+          defaultPlan: true
+
 targets:
   UITests:
     type: bundle.ui-testing
@@ -27,6 +47,8 @@ targets:
       linkType: static
     - package: Sentry
       linkType: static
+    - package: SnapshotTesting
+      linkType: static
 
     info:
       path: ../SupportingFiles/Info.plist
@@ -38,8 +60,18 @@ targets:
       debug:
       release:
 
+    preBuildScripts:
+      - name: Override Simulator Status Bars
+        runOnlyWhenInstalling: false
+        shell: /bin/sh
+        script: |
+          python3 $PROJECT_DIR/Tools/Scripts/bootTestSimulator.py --name 'iPhone 13 Pro Max' --version 'iOS.15.5'
+          python3 $PROJECT_DIR/Tools/Scripts/bootTestSimulator.py --name 'iPad (9th generation)' --version 'iOS.15.5'
+
     sources:
     - path: ../Sources
+      excludes:
+        - "**/__Snapshots__/**"
     - path: ../SupportingFiles
     - path: ../../Tools/Scripts/Templates/SimpleScreenExample/Tests/UI
     - path: ../../ElementX/Sources/BuildSettings.swift