Going from a passing test to a failing test is a regression

-- p_test.go --
package p

import "testing"

func TestP(t *testing.T) {
}

-- .commit --
Initial commit with passing test

-- p_test.go --
package p

import "testing"

func TestP(t *testing.T) {
	t.FailNow()
}

-- .commit --
Break test

-- .run_test --
# Errors

Test regressions detected between initial commit (INITIAL_COMMIT_HASH) and HEAD:

1: sketch.dev.TestP: Was passing, now failing


Please fix before proceeding.