fix randomly failing test and use file as lock source if no DSN

cmd/main.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path"
 	"strconv"
 	"strings"
 	"time"
@@ -38,11 +39,11 @@ func RunGlloq(env []string, args []string) (int, error) {
 
 	dsn := opts["dsn"]
 	if dsn == "" {
-		return 1, glloq.ErrDSNNotSet
+		// No DSN set, just use a static file.
+		tmpdir := os.TempDir()
+		dsn = "file://" + path.Join(tmpdir, "glloq-edw3KBE")
 	}
-
 	timeoutSeconds, _ := strconv.Atoi(opts["timeout"])
-
 	lockerOptions := glloq.Options{
 		DSN:     dsn,
 		Key:     opts["key"],

cmd/main_test.go

@@ -3,41 +3,37 @@ package main_test
 import (
 	"testing"
 
-	"github.com/gilbsgilbs/glloq"
 	cmd "github.com/gilbsgilbs/glloq/cmd"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestCli(t *testing.T) {
 	env := []string{
-		"GLLOQ_DSN=file://.lock",
 		"GLLOQ_POLL_DELAY=1",
 		"GLLOQ_TIMEOUT=5",
 	}
 
-	t.Run("test DSN not set", func(t *testing.T) {
-		exitCode, err := cmd.RunGlloq([]string{}, []string{})
-		assert.Equal(t, 1, exitCode)
-		assert.Equal(t, glloq.ErrDSNNotSet, err)
-	})
-
 	t.Run("runs", func(t *testing.T) {
 		exitCode, err := cmd.RunGlloq(env, []string{})
 		assert.Equal(t, 0, exitCode)
 		assert.Nil(t, err)
 	})
 
 	t.Run("runs concurrent run", func(t *testing.T) {
+		key := t.Name()
 		go func() {
 			if _, err := cmd.RunGlloq(
-				env,
+				append(env, "GLLOQ_KEY="+key),
 				[]string{"sleep", "5"},
 			); err != nil {
 				panic(err)
 			}
 		}()
 
-		exitCode, err := cmd.RunGlloq(env, []string{"sleep", "1"})
+		exitCode, err := cmd.RunGlloq(
+			append(env, "GLLOQ_KEY="+key),
+			[]string{"sleep", "1"},
+		)
 
 		assert.Equal(t, 0, exitCode)
 		assert.Nil(t, err)