Why Is My Sqlmock Not Matching My Query Despite Identical Input and Log Output?

Sqlmock Not Matching Query Despite Identical Input and Log Output

Query Mismatch Issue

When trying to write tests for a Gorm function using sqlmock, you may encounter an issue where sqlmock fails to match your SQL query, even though the log output shows identical queries. This mismatch can occur when using the ExpectQuery method.

Solution

To resolve this issue, it is recommended to use regexp.QuoteMeta() to escape your query before passing it to the ExpectQuery method. This function will properly escape any special characters that may be causing the mismatch. The updated code would look like this:

mock.ExpectQuery(regexp.QuoteMeta(`SELECT * FROM "storage_pools" WHERE "storage_pools"."deleted_at" IS NULL AND ((poolid = ?)) ORDER BY "storage_pools"."id" ASC LIMIT 1`))

Execution Mismatch Issue

You may also encounter another problem where sqlmock will not match your SELECT statement. This is because Gorm is performing multiple SELECT statements for some reason. The first statement will find the row, but the second statement will not.

To resolve this issue, you can use QueryMatcherOption(sqlmock.QueryMatcherEqual) in conjunction with ExpectQuery to force sqlmock to use exact string matching instead of its default fuzzier matching algorithm.

db, mock, err := sqlmock.New(sqlmock.QueryMatcherOption(sqlmock.QueryMatcherEqual))
if err != nil {
    t.Fatal(err)
}

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