Dart Matcher Best Practices

When to use this skill

Use this skill when:

• Writing assertions using expect and package:matcher.
• Migrating legacy manual checks to cleaner matchers.
• Debugging confusing test failures.

Discovery

To find candidates for improving matcher usage, search for suboptimal patterns:

Suboptimal Length Checks

Search for length checks that should use hasLength:

• Regex: expect\([^,]+.length,\s*