test: Add node tests with Mocha and Chai

test/node-test.js

@@ -0,0 +1,24 @@
+const { resolve } = require('path');
+const ColorThief = require(resolve(process.cwd(), "dist/color-thief-node.js"));
+const img = resolve(process.cwd(), 'cypress/test-pages/img/rainbow-vertical.png');
+const chai = require("chai");
+const expect = chai.expect;
+chai.use(require("chai-as-promised"));
+
+
+describe('getColor()', function() {
+    it('returns valid color', function() {
+        return expect(ColorThief.getColor(img)).to.eventually.have.lengthOf(3);
+    });
+});
+
+describe('getPalette()', function() {
+    it('returns 5 colors when colorCount set to 5', function() {
+        return expect(ColorThief.getPalette(img, 5)).to.eventually.have.lengthOf(5);
+    });
+
+    it('returns 9 colors when colorCount set to 9', function() {
+        return expect(ColorThief.getPalette(img, 9)).to.eventually.have.lengthOf(9);
+    });
+});
+