Add test

tests/constants.js

@@ -0,0 +1,18 @@
+const TIMEOUT = 30000;
+const BASE_URL = 'http://localhost:3000/tests/assets';
+const IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
+const OPTIONS = {
+  corePath: '../node_modules/@ffmpeg/core/ffmpeg-core.js',
+  ...(IS_BROWSER ? { workerPath: '../dist/worker.dev.js' } : {}),
+};
+const FLAME_MP4_LENGTH = 100374;
+
+if (typeof module !== 'undefined') {
+  module.exports = {
+    TIMEOUT,
+    BASE_URL,
+    IS_BROWSER,
+    OPTIONS,
+    FLAME_MP4_LENGTH,
+  };
+}