package config_test

import (
	"os"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"sneak.berlin/go/webhooker/internal/config"
)

// TestClearEnvForTest_RemovesAddedVariables pins that a variable set
// after the clear other than through t.Setenv, as a test's .env file
// sets one, is gone once the test ends, so it cannot reach the tests
// that run after it.
//
//nolint:paralleltest // ClearEnvForTest uses t.Setenv.
func TestClearEnvForTest_RemovesAddedVariables(t *testing.T) {
	// The outer clear keeps a value of the key exported in the shell
	// from making it a variable the inner clear has to put back.
	config.ClearEnvForTest(t)

	t.Run("loads a .env file after the clear", func(t *testing.T) {
		config.ClearEnvForTest(t)

		path := writeDotEnv(t, dotEnvKey+"=from-dot-env\n")
		require.NoError(t, config.LoadDotEnvFileForTest(path))
		require.Equal(t, "from-dot-env", os.Getenv(dotEnvKey))
	})

	_, present := os.LookupEnv(dotEnvKey)
	assert.False(
		t, present,
		"a variable set after the clear must not outlive the test",
	)
}