Factor out toRgba function and test

src/browser/Color.test.ts

@@ -4,7 +4,7 @@
  */
 
 import { assert } from 'chai';
-import { blend, fromCss, toPaddedHex, toCss } from 'browser/Color';
+import { blend, fromCss, toPaddedHex, toCss, toRgba } from 'browser/Color';
 
 describe('Color', () => {
   describe('blend', () => {
@@ -94,4 +94,45 @@ describe('Color', () => {
       assert.equal(toCss(0xff, 0xff, 0xff), '#ffffff');
     });
   });
+
+  describe('toRgba', () => {
+    it('should convert an rgb array to an rgba number', () => {
+      assert.equal(toRgba(0x00, 0x00, 0x00), 0x000000FF);
+      assert.equal(toRgba(0x10, 0x10, 0x10), 0x101010FF);
+      assert.equal(toRgba(0x20, 0x20, 0x20), 0x202020FF);
+      assert.equal(toRgba(0x30, 0x30, 0x30), 0x303030FF);
+      assert.equal(toRgba(0x40, 0x40, 0x40), 0x404040FF);
+      assert.equal(toRgba(0x50, 0x50, 0x50), 0x505050FF);
+      assert.equal(toRgba(0x60, 0x60, 0x60), 0x606060FF);
+      assert.equal(toRgba(0x70, 0x70, 0x70), 0x707070FF);
+      assert.equal(toRgba(0x80, 0x80, 0x80), 0x808080FF);
+      assert.equal(toRgba(0x90, 0x90, 0x90), 0x909090FF);
+      assert.equal(toRgba(0xa0, 0xa0, 0xa0), 0xa0a0a0FF);
+      assert.equal(toRgba(0xb0, 0xb0, 0xb0), 0xb0b0b0FF);
+      assert.equal(toRgba(0xc0, 0xc0, 0xc0), 0xc0c0c0FF);
+      assert.equal(toRgba(0xd0, 0xd0, 0xd0), 0xd0d0d0FF);
+      assert.equal(toRgba(0xe0, 0xe0, 0xe0), 0xe0e0e0FF);
+      assert.equal(toRgba(0xf0, 0xf0, 0xf0), 0xf0f0f0FF);
+      assert.equal(toRgba(0xff, 0xff, 0xff), 0xffffffFF);
+    });
+    it('should convert an rgba array to an rgba number', () => {
+      assert.equal(toRgba(0x00, 0x00, 0x00, 0x00), 0x00000000);
+      assert.equal(toRgba(0x10, 0x10, 0x10, 0x10), 0x10101010);
+      assert.equal(toRgba(0x20, 0x20, 0x20, 0x20), 0x20202020);
+      assert.equal(toRgba(0x30, 0x30, 0x30, 0x30), 0x30303030);
+      assert.equal(toRgba(0x40, 0x40, 0x40, 0x40), 0x40404040);
+      assert.equal(toRgba(0x50, 0x50, 0x50, 0x50), 0x50505050);
+      assert.equal(toRgba(0x60, 0x60, 0x60, 0x60), 0x60606060);
+      assert.equal(toRgba(0x70, 0x70, 0x70, 0x70), 0x70707070);
+      assert.equal(toRgba(0x80, 0x80, 0x80, 0x80), 0x80808080);
+      assert.equal(toRgba(0x90, 0x90, 0x90, 0x90), 0x90909090);
+      assert.equal(toRgba(0xa0, 0xa0, 0xa0, 0xa0), 0xa0a0a0a0);
+      assert.equal(toRgba(0xb0, 0xb0, 0xb0, 0xb0), 0xb0b0b0b0);
+      assert.equal(toRgba(0xc0, 0xc0, 0xc0, 0xc0), 0xc0c0c0c0);
+      assert.equal(toRgba(0xd0, 0xd0, 0xd0, 0xd0), 0xd0d0d0d0);
+      assert.equal(toRgba(0xe0, 0xe0, 0xe0, 0xe0), 0xe0e0e0e0);
+      assert.equal(toRgba(0xf0, 0xf0, 0xf0, 0xf0), 0xf0f0f0f0);
+      assert.equal(toRgba(0xff, 0xff, 0xff, 0xff), 0xffffffff);
+    });
+  });
 });