import ( "testing" "github.com/cockroachdb/cockroach/util" ) func TestMyFunction(t *testing.T) { // Run some test code if a != b { util.Tester.Fatalf("Error in MyFunction: Expected %d but got %d", a, b) } }In the above example, a test function is defined and Tester Fatalf is used to log a detailed error message if the expected and actual values do not match. The function terminates immediately after logging the error message. This helps in quick discovery and fixing of errors. Overall, the Tester Fatalf function is a useful tool for any Go developer working on testing projects.