Add freetype2 and git tests

wasm/tests/freetype2.test.js

+const fs = require('fs');
+const path = require('path');
+const { TIMEOUT } = require('./config');
+const { runFFmpeg, b64ToUint8Array } = require('./utils');
+const ARIAL_TTF = require('./data/arial.ttf.js');
+const IN_FILE_NAME = 'video-1s.avi';
+const OUT_FILE_NAME = 'video.mp4';
+const FILE_SIZE = 37243;
+let aviData = null;
+
+beforeAll(() => {
+  aviData = Uint8Array.from(fs.readFileSync(path.join(__dirname, 'data', IN_FILE_NAME)));
+});
+
+test('transcode avi to x264 mp4 with drawtext', async () => {
+  const args = ['-i', IN_FILE_NAME, '-vf', 'drawtext=fontfile=/arial.ttf:text=\'Artist\':fontcolor=white:fontsize=24:x=(w-text_w)/2:y=(h-text_h)/2', OUT_FILE_NAME];
+  const { fileSize } = await runFFmpeg(IN_FILE_NAME, aviData, args, OUT_FILE_NAME, [{ name: 'arial.ttf', data: b64ToUint8Array(ARIAL_TTF) }]);
+  expect(fileSize).toBe(FILE_SIZE);
+}, TIMEOUT);

wasm/tests/gif.test.js

+const fs = require('fs');
+const path = require('path');
+const { TIMEOUT } = require('./config');
+const { runFFmpeg } = require('./utils');
+const IN_FILE_NAME = 'video-1s.avi';
+const OUT_FILE_NAME = 'video.gif';
+const FILE_SIZE = 181674;
+let aviData = null;
+
+beforeAll(() => {
+  aviData = Uint8Array.from(fs.readFileSync(path.join(__dirname, 'data', IN_FILE_NAME)));
+});
+
+test('transcode avi to gif', async () => {
+  const args = ['-i', IN_FILE_NAME, '-f', 'gif', OUT_FILE_NAME];
+  const { fileSize } = await runFFmpeg(IN_FILE_NAME, aviData, args, OUT_FILE_NAME);
+  expect(fileSize).toBe(FILE_SIZE);
+}, TIMEOUT);

wasm/tests/utils.js

@@ -19,7 +19,7 @@ const ffmpeg = (Core, args) => {
   );
 };
 
-const runFFmpeg = async (ifilename, data, args, ofilename) => {
+const runFFmpeg = async (ifilename, data, args, ofilename, extraFiles = []) => {
   let resolve = null;
   let file = null;
   let fileSize = -1;
@@ -31,6 +31,9 @@ const runFFmpeg = async (ifilename, data, args, ofilename) => {
       }
     },
   });
+  extraFiles.forEach(({ name, data: d }) => {
+    Core.FS.writeFile(name, d);
+  });
   Core.FS.writeFile(ifilename, data);
   ffmpeg(Core, args);
   await new Promise((_resolve) => { resolve = _resolve });
@@ -42,7 +45,10 @@ const runFFmpeg = async (ifilename, data, args, ofilename) => {
   return { Core, file, fileSize };
 };
 
+const b64ToUint8Array = (str) => (Buffer.from(str, 'base64'));
+
 module.exports = {
   runFFmpeg,
+  b64ToUint8Array,
   ffmpeg,
 };