sort output of Write/Marshal

godotenv.go

@@ -21,6 +21,7 @@ import (
 	"os"
 	"os/exec"
 	"regexp"
+	"sort"
 	"strings"
 )
 
@@ -165,6 +166,7 @@ func Marshal(envMap map[string]string) (string, error) {
 	for k, v := range envMap {
 		lines = append(lines, fmt.Sprintf(`%s="%s"`, k, doubleQuoteEscape(v)))
 	}
+	sort.Strings(lines)
 	return strings.Join(lines, "\n"), nil
 }
 

godotenv_test.go

@@ -348,6 +348,9 @@ func TestWrite(t *testing.T) {
 	writeAndCompare(`key=va'lu'e`, `key="va'lu'e"`)
 	// newlines, backslashes, and some other special chars are escaped
 	writeAndCompare(`foo="$ba\n\r\\r!"`, `foo="\$ba\n\r\\r\!"`)
+	// lines should be sorted
+	writeAndCompare("foo=bar\nbaz=buzz", "baz=\"buzz\"\nfoo=\"bar\"")
+
 }
 
 func TestRoundtrip(t *testing.T) {