Why is Sqlmock Failing to Match My Query Despite Identical Output in the Log?

Sqlmock Not Matching Query Despite Identity in Log Output

Error Message

When attempting to match a query in a Gorm test using sqlmock, the following error is encountered:

(path/to/my/project/database.go:263)
[2020-01-08 10:29:40]  Query: could not match actual sql: "SELECT * FROM "storage_pools" WHERE "storage_pools"."deleted_at" IS NULL AND ((poolid = ?)) ORDER BY "storage_pools"."id" ASC LIMIT 1" with expected regexp "SELECT * FROM "storage_pools" WHERE "storage_pools"."deleted_at" IS NULL AND ((poolid = ?)) ORDER BY "storage_pools"."id" ASC LIMIT 1"

Resolution

The issue stems from the use of regexp as the sqlmock query matcher. By default, sqlmock uses a strict equality query matcher, which requires an exact match between the actual query and the expected pattern.

To solve this, use the QueryMatcherEqual option to replace the default query matcher:

QueryMatcherOption(sqlmock.QueryMatcherEqual)

Additional Considerations

• Ensure that the sqlmock query matches the actual query string, including any special characters that may need to be escaped.
• If the query includes literal values, use WithArgs() to specify the arguments and escape them as necessary.
• If the query includes functions or complex conditions, use regexp.QuoteMeta() to convert it to a regular expression that sqlmock can match.

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