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It's a known issue that using `t.FailNow()` in deferred functions
can result in the error not being printed:
golang/go#29207
`t.FailNow` is also called by the `require` package, so using that in
deferred functions, including `t.Cleanup` functions, can result in the
error not being printed.
I can consistently reproduce that issue when the test is run in parallel
and also has subtests which are run in parallel. Minimal reproducer:
package main
import (
"testing"
"github.com/stretchr/testify/require"
)
func Test(t *testing.T) {
t.Parallel()
t.Cleanup(func() { require.Fail(t, "This error is never printed") })
t.Run("subtest", func(t *testing.T) { t.Parallel() })
}
Using non-fatal errors instead fixes the issue.
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3v1n0
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Nov 25, 2025
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It's a known issue that using
t.FailNow()in deferred functions can result in the error not being printed.t.FailNowis also called by therequirepackage, so using that in deferred functions, includingt.Cleanupfunctions, can result in the error not being printed.I can consistently reproduce that issue when the test is run in parallel and also has subtests which are run in parallel. Minimal reproducer:
Using non-fatal errors instead fixes the issue.