How do you test merge fields in automation?

Merge field testing prevents embarrassing personalization failures:

Complete data testing: Test with profiles that have all fields populated. Verify values render correctly in all locations.

Missing data testing: Test with profiles missing key fields. Verify fallback values appear correctly. Confirm no broken merge tags display.

Edge case testing: Very long names or values. Special characters and international characters. Numeric values in text fields.

Dynamic content interaction: Test merge fields within dynamic content blocks. Verify correct values render in each variation.

Multiple field testing: Test profiles with different field combinations. Verify each merge point handles its specific data.

Preview tools: Use ESP preview with actual recipient data. Rotate through multiple test profiles.

Broken merge tags destroy trust instantly. Test every scenario that could cause failure.