Function runCommand

cmds/cmd_test.go:60–88

runCommand builds the cobra command from `command`, feeds it `args` just like a user would on the shell, captures everything the command writes to stderr, and returns (stderr, executeErr).

(t *testing.T, cmd *cobra.Command, args ...string)

// like a user would on the shell, captures everything the command writes to
// stderr, and returns (stderr, executeErr).
func runCommand(t *testing.T, cmd *cobra.Command, args ...string) (string, error) {
	t.Helper()

	// Redirect os.Stderr to a pipe. Anything the command writes to
	// stderr lands in `reader`. We restore the original os.Stderr before returning.
	stdErr := os.Stderr
	reader, writer, err := os.Pipe()
	if err != nil {
		t.Fatal(err)
	}
	os.Stderr = writer

	// Drain the pipe in a goroutine while the command runs.
	done := make(chan string, 1)
	go func() {
		var buf strings.Builder
		_, _ = io.Copy(&buf, reader)
		done <- buf.String()
	}()

	// Run the command, then close the write end so the goroutine sees
	// EOF and exits. Order matters: close must happen before <-done,
	// otherwise the receive blocks forever.
	cmd.SetArgs(args)
	execErr := cmd.Execute()
	_ = writer.Close()
	os.Stderr = stdErr
	return <-done, execErr
}

// equals reports whether list1 and list2 contain the same elements, ignoring order.
func equals(list1, list2 []string) bool {