fix: workaround GitLab behavior when a variable with forced service container visibility is unset

func (env EnvStr) Or(def string) string {

	if v, ok := os.LookupEnv(string(env)); ok {

		if v == "$"+string(env) || v == "" {

			// workaround of GitLab behavior when defining a variable as:

			// VAR: "$VAR"

			// when VAR is unset at project level, its value remains literally '$VAR'

			return def

		}

		return v

	}

/*

 * Copyright (C) 2021 Orange & contributors

 *

 * This program is free software; you can redistribute it and/or modify it under the terms

 *

 * of the GNU Lesser General Public License as published by the Free Software Foundation;

 * either version 3 of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 * See the GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License along with this

 * program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth

 * Floor, Boston, MA  02110-1301, USA.

 */

package internal

import (

	"os"

	"testing"

)

func Test_getenv_when_var_unset(t *testing.T) {

	os.Unsetenv("TESTVAR")

	// os.Setenv("TESTVAR", "test")

	val := EnvStr("TESTVAR").Or("default")

	if val != "default" {

		t.Fatalf("Assert error\nExpected:\n%s\nGot:\n%s", "default", val)

	}

}

func Test_getenv_when_var_empty(t *testing.T) {

	os.Setenv("TESTVAR", "")

	val := EnvStr("TESTVAR").Or("default")

	if val != "default" {

		t.Fatalf("Assert error\nExpected:\n%s\nGot:\n%s", "default", val)

	}

}

func Test_getenv_when_var_gitlab_unset(t *testing.T) {

	os.Setenv("TESTVAR", "$TESTVAR")

	val := EnvStr("TESTVAR").Or("default")

	if val != "default" {

		t.Fatalf("Assert error\nExpected:\n%s\nGot:\n%s", "default", val)

	}

}

func Test_getenv_when_var_set(t *testing.T) {

	os.Setenv("TESTVAR", "testval")

	val := EnvStr("TESTVAR").Or("default")

	if val != "testval" {

		t.Fatalf("Assert error\nExpected:\n%s\nGot:\n%s", "testval", val)

	}

}