diff --git a/test/use_case/find_file_test.dart b/test/use_case/find_file_test.dart
new file mode 100644
index 00000000..a56060b3
--- /dev/null
+++ b/test/use_case/find_file_test.dart
@@ -0,0 +1,40 @@
+import 'package:nc_photos/use_case/find_file.dart';
+import 'package:test/test.dart';
+
+import '../mock_type.dart';
+import '../test_util.dart' as util;
+
+void main() {
+  util.initLog();
+  group("FindFile", () {
+    test("file", _findFile);
+    test("missing file", _findMissingFile);
+  });
+}
+
+/// Find a file in app db
+///
+/// Expect: return the file found
+Future<void> _findFile() async {
+  final account = util.buildAccount();
+  final files = (util.FilesBuilder()
+        ..addJpeg("admin/test1.jpg")
+        ..addJpeg("admin/test2.jpg"))
+      .build();
+  final appDb = MockAppDb();
+  await util.fillAppDb(appDb, account, files);
+
+  expect(await FindFile(appDb)(account, 1), files[1]);
+}
+
+/// Find a file not existing in app db
+///
+/// Expect: throw StateError
+Future<void> _findMissingFile() async {
+  final account = util.buildAccount();
+  final files = (util.FilesBuilder()..addJpeg("admin/test1.jpg")).build();
+  final appDb = MockAppDb();
+  await util.fillAppDb(appDb, account, files);
+
+  expect(() => FindFile(appDb)(account, 1), throwsStateError);
+}