package go_environment

import (
	"os"
	"testing"
)

const (
	envKey    = "ENV_STRING_TEST_VAR"
	testValue = "dummy"
	testJSON  = `"` + envKey + `"`
)

func TestEnvString(t *testing.T) {
	os.Setenv(envKey, "")
	test := EnvironmentString{
		Variable: envKey,
	}
	if test.Key() != envKey {
		t.Errorf("unexpected environment variable key")
	}
	if test.Valid() {
		t.Errorf("unexpectedly valid environment variable")
	}
	if test.String() != "" {
		t.Errorf("unexpectedly valid environment variable")
	}
	os.Setenv(envKey, testValue)
	if !test.Valid() {
		t.Errorf("unexpectedly invalid environment variable")
	}
	if test.String() != testValue {
		t.Errorf("unexpectedly valid environment variable")
	}
	os.Unsetenv(envKey)
}

func TestEnvStringMarshalling(t *testing.T) {
	test := EnvironmentString{}
	if test.UnmarshalJSON([]byte(testJSON)) != nil {
		t.Errorf("failed to unmarshal")
	}
	if test.Key() != envKey {
		t.Errorf("unexpected environment variable key")
	}
	if binary, err := test.MarshalJSON(); err != nil {
		t.Errorf("failed to marshal")
	} else if string(binary) != testJSON {
		t.Errorf("unexpected JSON")
	}
}

func TestValid(t *testing.T) {
	os.Setenv(envKey, testValue)
	test := EnvironmentString{
		Variable: "",
	}
	if test.Valid() {
		t.Errorf("TestValid: test case 1: unexpectedly valid environment variable")
	}
	test.Variable = envKey
	if !test.Valid() {
		t.Errorf("TestValid: test case 2: unexpectedly invalid environment variable")
	}
	os.Unsetenv(envKey)
	if test.Valid() {
		t.Errorf("TestValid: test case 3: unexpectedly valid environment variable")
	}
}