feat: refine deterministic order test

Signed-off-by: Brian McGee <[email protected]>

cmd/root_test.go

@@ -1564,18 +1564,11 @@ func TestStdin(t *testing.T) {
 func TestDeterministicOrderingInPipeline(t *testing.T) {
 	as := require.New(t)
 
-	// capture current cwd, so we can replace it after the test is finished
-	cwd, err := os.Getwd()
-	as.NoError(err)
-
-	t.Cleanup(func() {
-		// return to the previous working directory
-		as.NoError(os.Chdir(cwd))
-	})
-
 	tempDir := test.TempExamples(t)
 	configPath := tempDir + "/treefmt.toml"
 
+	test.ChangeWorkDir(t, tempDir)
+
 	test.WriteConfig(t, configPath, &config.Config{
 		FormatterConfigs: map[string]*config.Formatter{
 			// a and b have no priority set, which means they default to 0 and should execute first
@@ -1600,8 +1593,7 @@ func TestDeterministicOrderingInPipeline(t *testing.T) {
 		},
 	})
 
-	_, err = treefmt(t, "-C", tempDir)
-	as.NoError(err)
+	treefmt2(t, withNoError(t))
 
 	matcher := regexp.MustCompile("^fmt-(.*)")