profile: Display user email

Fixes: zulip#291

Author: sm-sayedi

lib/widgets/profile.dart

@@ -50,7 +50,10 @@ class ProfilePage extends StatelessWidget {
         textAlign: TextAlign.center,
         style: _TextStyles.primaryFieldText
           .merge(weightVariableTextStyle(context, wght: 700))),
-      // TODO(#291) render email field
+      if (user.deliveryEmail != null)
+        Text(user.deliveryEmail!,
+          textAlign: TextAlign.center,
+          style: _TextStyles.primaryFieldText),
       Text(roleToLabel(user.role, zulipLocalizations),
         textAlign: TextAlign.center,
         style: _TextStyles.primaryFieldText),

test/widgets/profile_test.dart

@@ -71,12 +71,14 @@ void main() {
 
   group('ProfilePage', () {
     testWidgets('page builds; profile page renders', (WidgetTester tester) async {
-      final user = eg.user(userId: 1, fullName: 'test user');
+      final user = eg.user(userId: 1, fullName: 'test user',
+        deliveryEmail: '[email protected]');
 
       await setupPage(tester, users: [user], pageUserId: user.userId);
 
       check(because: 'find user avatar', find.byType(Avatar).evaluate()).length.equals(1);
       check(because: 'find user name', find.text('test user').evaluate()).isNotEmpty();
+      check(because: 'find user delivery email', find.text('[email protected]').evaluate()).isNotEmpty();
     });
 
     testWidgets('page builds; profile page renders with profileData', (WidgetTester tester) async {