[Banner] Use Arabic for RTL snapshot test (#8010)

Related to #7993. We need to use real RTL script to avoid Bi-Di issue in TextView.

components/Banner/tests/snapshot/MDCBannerSnapshotTests.m

@@ -24,6 +24,13 @@
 static NSString *const kBannerLongText =
     @"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt.";
 
+// Arabic text constants for testing Banner in RTL mode.
+static NSString *const kBannerShortTextArabic = @"ما تنفّس.";
+static NSString *const kBannerMiddleLengthTextArabic =
+    @"دول السيطرة استطاعوا ٣٠. مليون وفرنسا أوراقهم انه تم.";
+static NSString *const kBannerLongTextArabic =
+    @"دول السيطرة استطاعوا ٣٠. مليون وفرنسا أوراقهم انه تم, نفس قد والديون العالمية. دون ما تنفّس.";
+
 // Content Padding is used for testing banner with specific layout margins.
 static const CGFloat kBannerContentPadding = 10.0f;
 static const CGFloat kBannerLargeContentPadding = 30.0f;
@@ -166,9 +173,9 @@ - (void)testShortTextWithSingleActionLTR {
   [self generateSnapshotAndVerifyForView:self.bannerView];
 }
 
-- (void)testShortTextWithSingleActionRTL {
+- (void)testShortTextWithSingleActionRTLInArabic {
   // When
-  self.bannerView.textLabel.text = kBannerShortText;
+  self.bannerView.textLabel.text = kBannerShortTextArabic;
   MDCButton *button = self.bannerView.leadingButton;
   [button setTitle:@"Action" forState:UIControlStateNormal];
   [button setTitleColor:UIColor.blackColor forState:UIControlStateNormal];
@@ -195,9 +202,9 @@ - (void)testLongTextWithSingleActionLTR {
   [self generateSnapshotAndVerifyForView:self.bannerView];
 }
 
-- (void)testLongTextWithSingleActionRTL {
+- (void)testLongTextWithSingleActionRTLInArabic {
   // When
-  self.bannerView.textLabel.text = kBannerLongText;
+  self.bannerView.textLabel.text = kBannerLongTextArabic;
   MDCButton *button = self.bannerView.leadingButton;
   [button setTitle:@"Action" forState:UIControlStateNormal];
   [button setTitleColor:UIColor.blackColor forState:UIControlStateNormal];
@@ -227,9 +234,9 @@ - (void)testLongTextWithTwoActionsLTR {
   [self generateSnapshotAndVerifyForView:self.bannerView];
 }
 
-- (void)testLongTextWithTwoActionsRTL {
+- (void)testLongTextWithTwoActionsRTLInArabic {
   // When
-  self.bannerView.textLabel.text = kBannerLongText;
+  self.bannerView.textLabel.text = kBannerLongTextArabic;
   MDCButton *button1 = self.bannerView.leadingButton;
   [button1 setTitle:@"Action1" forState:UIControlStateNormal];
   [button1 setTitleColor:UIColor.blackColor forState:UIControlStateNormal];
@@ -317,9 +324,9 @@ - (void)testSingleRowStyleLongTextWithSingleActionLTR {
   [self generateSnapshotAndVerifyForView:self.bannerView];
 }
 
-- (void)testSingleRowStyleLongTextWithSingleActionRTL {
+- (void)testSingleRowStyleLongTextWithSingleActionRTLInArabic {
   // When
-  self.bannerView.textLabel.text = kBannerLongText;
+  self.bannerView.textLabel.text = kBannerLongTextArabic;
   MDCButton *button1 = self.bannerView.leadingButton;
   [button1 setTitle:@"Action1" forState:UIControlStateNormal];
   [button1 setTitleColor:UIColor.blackColor forState:UIControlStateNormal];
@@ -350,9 +357,9 @@ - (void)testLongTextWithTwoActionsAndIconLTR {
   [self generateSnapshotAndVerifyForView:self.bannerView];
 }
 
-- (void)testLongTextWithTwoActionsAndIconRTL {
+- (void)testLongTextWithTwoActionsAndIconRTLInArabic {
   // When
-  self.bannerView.textLabel.text = kBannerLongText;
+  self.bannerView.textLabel.text = kBannerLongTextArabic;
   MDCButton *button1 = self.bannerView.leadingButton;
   [button1 setTitle:@"Action1" forState:UIControlStateNormal];
   [button1 setTitleColor:UIColor.blackColor forState:UIControlStateNormal];