content test [nfc]: Add defaultTextStyleOverride

Author: chrisbobbe

test/widgets/content_test.dart

@@ -96,6 +96,7 @@ void main() {
     bool wrapWithScaffold = false,
     bool wrapWithPerAccountStoreWidget = false,
     bool wrapWithMessageContent = false,
+    TextStyle? defaultTextStyleOverride,
   }) async {
     Widget widget = BlockContentList(nodes: parseContent(html).nodes);
 
@@ -105,6 +106,11 @@ void main() {
         content: parseContent(html));
     }
 
+    if (defaultTextStyleOverride != null) {
+      widget = DefaultTextStyle(style: defaultTextStyleOverride,
+        child: widget);
+    }
+
     if (wrapWithScaffold) {
       widget = Scaffold(body: widget);
     }