diff --git a/main_test.go b/main_test.go
index f1276e8..409fce3 100644
--- a/main_test.go
+++ b/main_test.go
@@ -14,7 +14,7 @@ func Test_run(t *testing.T) {
 	dirBlank := ""
 	dirValid := "examples/localizations_src"
 	dirTestFiles := "test_files"
-
+	dirWithBad := "mock"
 	tests := []struct {
 		name    string
 		args    args
@@ -35,6 +35,14 @@ func Test_run(t *testing.T) {
 			},
 			wantErr: true,
 		},
+		{
+			name: "not valid",
+			args: args{
+				in:  &dirWithBad,
+				out: &dirTestFiles,
+			},
+			wantErr: true,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {