Return url of test database (#48)

It is helpful to connect to a database when tests have failed.

internal/db/testing_test.go

@@ -6,7 +6,7 @@ import (
 
 func Test_Utils(t *testing.T) {
 	t.Parallel()
-	cleanup, conn := TestSetup(t, "postgres")
+	cleanup, conn, _ := TestSetup(t, "postgres")
 	defer cleanup()
 	defer conn.Close()
 	t.Run("nothing", func(t *testing.T) {