Adding Test modules for GIF's (#1530)

* Test for GIF

* some cleanup

* Some cleanup

* Some code cleanup

* cleanup

Co-authored-by: Jeffrey Warren <jeff@unterbahn.com>
Co-authored-by: Rishabh Shukla <42492389+blurry-x-face@users.noreply.github.com>
Co-authored-by: Harsh Khandeparkar <34770591+HarshKhandeparkar@users.noreply.github.com>

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

@@ -0,0 +1,33 @@
+const test = require('tape'),
+  base64Img = require('base64-img');
+
+const ImageSequencer = require('../../../src/ImageSequencer');
+
+const test_gif = require('../images/test.gif.js');
+target = 'test_outputs';
+
+/**
+ * @method ModuleTest.
+ * @description a common test for modules.
+ * @param {String} moduleName name of the module.
+ * @param {"Object"} options module options.
+ * @param {String} benchmark dataURI of the benchmark gif.
+ * @param {String} [input="test_gif"] optional input image. Default is a test gif.
+ */
+module.exports = (moduleName, options, benchmark, input) => {
+  let sequencer = ImageSequencer({ui: false});
+  sequencer.loadImages(input || test_gif);
+  sequencer.addSteps(moduleName, options);
+  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`);
+      sequencer = null;
+      t.end();
+    });
+  });
+};