Add accessibility identifiers to registration view.

Signal/src/ViewControllers/Registration/RegistrationViewController.m

@@ -18,6 +18,11 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+#define SUBVIEW_ACCESSIBILITY_IDENTIFIER(_root_view, _variable_name)                                                   \
+    ([NSString stringWithFormat:@"%@.%@", _root_view.class, _variable_name])
+#define SET_SUBVIEW_ACCESSIBILITY_IDENTIFIER(_root_view, _variable_name)                                               \
+    _variable_name.accessibilityIdentifier = SUBVIEW_ACCESSIBILITY_IDENTIFIER(_root_view, (@ #_variable_name))
+
 #ifdef DEBUG
 
 NSString *const kKeychainService_LastRegistered = @"kKeychainService_LastRegistered";
@@ -81,6 +86,7 @@ NSString *const kKeychainKey_LastRegisteredPhoneNumber = @"kKeychainKey_LastRegi
     self.view.userInteractionEnabled = YES;
     [self.view
         addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backgroundTapped:)]];
+    self.view.accessibilityIdentifier = SUBVIEW_ACCESSIBILITY_IDENTIFIER(self, @"root_view");
 
     UIView *headerWrapper = [UIView containerView];
     [self.view addSubview:headerWrapper];
@@ -112,6 +118,7 @@ NSString *const kKeychainKey_LastRegisteredPhoneNumber = @"kKeychainKey_LastRegi
     legalTopMatterLabel.textAlignment = NSTextAlignmentCenter;
     legalTopMatterLabel.attributedText = attributedLegalTopMatter;
     legalTopMatterLabel.userInteractionEnabled = YES;
+    SET_SUBVIEW_ACCESSIBILITY_IDENTIFIER(self, legalTopMatterLabel);
 
     UITapGestureRecognizer *tapGesture =
         [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTapLegalTerms:)];
@@ -157,6 +164,7 @@ NSString *const kKeychainKey_LastRegisteredPhoneNumber = @"kKeychainKey_LastRegi
     [countryRow
         addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self
                                                                      action:@selector(countryCodeRowWasTapped:)]];
+    SET_SUBVIEW_ACCESSIBILITY_IDENTIFIER(self, countryRow);
 
     UILabel *countryNameLabel = [UILabel new];
     countryNameLabel.text
@@ -216,6 +224,7 @@ NSString *const kKeychainKey_LastRegisteredPhoneNumber = @"kKeychainKey_LastRegi
     [phoneNumberRow addSubview:phoneNumberTextField];
     [phoneNumberTextField autoVCenterInSuperview];
     [phoneNumberTextField autoPinTrailingToSuperviewMargin];
+    SET_SUBVIEW_ACCESSIBILITY_IDENTIFIER(self, phoneNumberTextField);
 
     UILabel *examplePhoneNumberLabel = [UILabel new];
     self.examplePhoneNumberLabel = examplePhoneNumberLabel;
@@ -253,6 +262,7 @@ NSString *const kKeychainKey_LastRegisteredPhoneNumber = @"kKeychainKey_LastRegi
     [activateButton autoPinLeadingAndTrailingToSuperviewMargin];
     [activateButton autoPinEdge:ALEdgeTop toEdge:ALEdgeBottom ofView:separatorView2 withOffset:15];
     [activateButton autoSetDimension:ALDimensionHeight toSize:kActivateButtonHeight];
+    SET_SUBVIEW_ACCESSIBILITY_IDENTIFIER(self, activateButton);
 
     UIActivityIndicatorView *spinnerView =
         [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
@@ -282,6 +292,8 @@ NSString *const kKeychainKey_LastRegisteredPhoneNumber = @"kKeychainKey_LastRegi
                             withOffset:ScaleFromIPhone5To7Plus(8, 12)];
     [bottomLegalLinkButton setCompressionResistanceHigh];
     [bottomLegalLinkButton setContentHuggingHigh];
+
+    SET_SUBVIEW_ACCESSIBILITY_IDENTIFIER(self, bottomLegalLinkButton);
 }
 
 - (void)viewDidAppear:(BOOL)animated