try moving to Github Actions from Travis for CI (#1783)

* try moving to Github Actions from Travis for CI

* npm install

* add apt-get prereqs

* Update continuous-integration.yml

* Update .github/workflows/continuous-integration.yml

Co-authored-by: Barun Acharya <47106543+daemon1024@users.noreply.github.com>

* use resemblejs in gif-tests

* trying `npm run setup`

* fix: use ubuntu latest for github actions

Co-authored-by: Barun Acharya <47106543+daemon1024@users.noreply.github.com>

* Update .github/workflows/continuous-integration.yml

* fix: try more changes

- fix: install `libcairo2-dev` explicitly with apt.
- fix: use Ubuntu 18.04

* fix<actions>: merge dependency installs in one command

* fix<actions>: include more dependencies

* GitHub actions running parallel (#1787)

* try running tests parallely

* setup composite actions

* Update continuous-integration.yml

* setup all jobs

* just install instead of setup

* trying ci without ubuntu package deps

* cache node modules in ci

* remove action.yml

* name change for brevity

* add recommended deps for tape-run

* xvfb-run --auto-servernum npm run core-tests

Co-authored-by: Barun Acharya <47106543+daemon1024@users.noreply.github.com>
Co-authored-by: daemon1024 <barun1024@gmail.com>
Co-authored-by: Harsh Khandeparkar <34770591+HarshKhandeparkar@users.noreply.github.com>

test/core/templates/gif-module-test.js

@@ -1,6 +1,8 @@
 const test = require('tape'),
   base64Img = require('base64-img');
 
+const compare = require('resemblejs').compare;
+
 const ImageSequencer = require('../../../src/ImageSequencer');
 
 const test_gif = require('../images/test.gif.js');
@@ -15,19 +17,37 @@ target = 'test_outputs';
  * @param {String} [input="test_gif"] optional input image. Default is a test gif.
  */
 module.exports = (moduleName, options, benchmark, input) => {
-  let sequencer = ImageSequencer({ui: false});
+  let sequencer = ImageSequencer({ ui: false });
   sequencer.loadImages(input || test_gif);
   sequencer.addSteps(moduleName, options);
-  test(`${moduleName} module works correctly`, t => {
-    sequencer.run({mode: 'test'}, () => {
+  test(`${moduleName} module works correctly`, (t) => {
+    sequencer.run({ mode: 'test' }, () => {
       let result = sequencer.steps[1].output.src;
 
       base64Img.imgSync(result, target, `${moduleName}-result`);
       base64Img.imgSync(benchmark, target, `${moduleName}-benchmark`);
 
-      t.equal(result === benchmark, true, `${moduleName} module works correctly with Gif`);
+      let mismatch = 100;
+      compare(
+        result,
+        benchmark,
+        { returnEarlyThreshold: 5 },
+        (err, { rawMisMatchPercentage }) => {
+          if (err) {
+            console.log('An error while comparing!');
+          } else {
+            mismatch = rawMisMatchPercentage;
+          }
+        }
+      );
+
+      t.equal(
+        mismatch < 5,
+        true,
+        `${moduleName} module works correctly with Gif`
+      );
       sequencer = null;
       t.end();
     });
   });
-};
+};