### Question:
MarkwonBasedMarkdownRenderer implements Markdown { @VisibleForTesting String fixInvalidSpoilers(String markdown) { try { Matcher matcher = POTENTIALLY_INVALID_SPOILER_MARKDOWN_PATTERN.matcher(markdown); while (matcher.find()) { String fullMatch = matcher.group(0); String spoilerLabel = matcher.group(1); String spoilerUrl = matcher.group(2).trim(); String spoilerContent = matcher.group(3); if (!RedditSpoilerLinkVisitor.isValidSpoilerUrl(spoilerUrl)) { continue; } markdown = markdown.replace(fullMatch, String.format("[%s](/s \"%s\")", spoilerLabel, spoilerContent)); } } catch (Throwable e) { Timber.e(e, "Couldn't fix invalid spoilers in: %s", markdown); } return markdown; } @Inject  MarkwonBasedMarkdownRenderer(
      SpannableConfiguration configuration,
      AutoRedditLinkExtension autoRedditLinkExtension,
      EmptyListItemHandlerExtension emptyListItemHandlerExtension,
      MarkdownHintOptions markdownOptions,
      @Named("markwon_spans_renderer") Cache<String, CharSequence> cache); @Override CharSequence parse(PendingSyncReply reply); @Override CharSequence parseAuthorFlair(String flair); @Override CharSequence parse(Message message); @Override CharSequence parse(Comment comment); @Override CharSequence parseSelfText(Submission submission); @Override @Deprecated String stripMarkdown(Comment comment); @Override String stripMarkdown(Message message); @Override void clearCache();  }### Answer:
@Test public void fixInvalidSpoilers() { String invalid = "[spoiler](/s \"I will be hanged\")\n" + "[spoiler](# s\"I will be hanged\")\n" + "[spoiler](/s \"\"you will hang me.\"\")\n" + "[spoiler](/s \"\"\"you will hang me.\"\"\")"; String expected = "[spoiler](/s \"I will be hanged\")\n" + "[spoiler](/s \"I will be hanged\")\n" + "[spoiler](/s \"you will hang me.\")\n" + "[spoiler](/s \"you will hang me.\")"; String parsed = renderer.fixInvalidSpoilers(invalid); assertEquals(expected, parsed); }
@Test public void avoidFixingValidSpoilers() { String valid = "[FAQ](http: "[Feedback](http: String parsed = renderer.fixInvalidSpoilers(valid); assertEquals(valid, parsed); }