add pal() tests

Author: luizbills

tests/_preload/happy-dom.js

@@ -7,12 +7,16 @@ import { GlobalRegistrator } from '@happy-dom/global-registrator'
  * @returns {Promise<Function>}
  */
 global.onLitecanvas = function (instance, event, callback) {
-    return new Promise((resolve) => {
+    return new Promise((resolve, reject) => {
         const removeListener = instance.listen(event, (...args) => {
-            const res = callback(...args)
-            if (false !== res) {
-                removeListener()
-                resolve()
+            try {
+                const res = callback(...args)
+                if (false !== res) {
+                    removeListener()
+                    resolve()
+                }
+            } catch (err) {
+                reject(err)
             }
         })
     })

tests/pal.js

@@ -0,0 +1,44 @@
+import test from 'ava'
+import litecanvas from '../src/index.js'
+import { defaultPalette } from '../src/palette.js'
+import * as sinon from 'sinon'
+
+let /** @type {LitecanvasInstance} */
+    local,
+    /** @type {sinon.SinonSpiedInstance<CanvasRenderingContext2D>} */
+    contextSpy
+
+test.before(() => {
+    sinon.stub(console) // silent console
+
+    local = litecanvas({
+        global: false,
+    })
+
+    contextSpy = sinon.spy(local.ctx())
+})
+
+test.after(() => {
+    local.quit()
+})
+
+test('change the color palette', async (t) => {
+    await onLitecanvas(local, 'draw', () => {
+        const customPalette = ['#123', '#456']
+        local.pal(customPalette)
+
+        const colors = local.stat(5)
+
+        t.is(colors[0], customPalette[0])
+    })
+})
+
+test('reset the color palette', async (t) => {
+    await onLitecanvas(local, 'draw', () => {
+        local.pal()
+
+        const colors = local.stat(5)
+
+        t.is(colors[0], defaultPalette[0])
+    })
+})