use exit errors in uts

app_test.go

@@ -1669,7 +1669,7 @@ func TestHandleExitCoder_Default(t *testing.T) {
 	}
 
 	ctx := NewContext(app, fs, nil)
-	app.handleExitCoder(ctx, errors.New("Default Behavior Error"))
+	app.handleExitCoder(ctx, NewExitError("Default Behavior Error", 42))
 
 	output := fakeErrWriter.String()
 	if !strings.Contains(output, "Default") {
@@ -1689,7 +1689,7 @@ func TestHandleExitCoder_Custom(t *testing.T) {
 	}
 
 	ctx := NewContext(app, fs, nil)
-	app.handleExitCoder(ctx, errors.New("Default Behavior Error"))
+	app.handleExitCoder(ctx, NewExitError("Default Behavior Error", 42))
 
 	output := fakeErrWriter.String()
 	if !strings.Contains(output, "Custom") {