1 files changed, 57 insertions, 0 deletions
diff --git a/packages/webapi/test/offscreencanvas.js b/packages/webapi/test/offscreencanvas.js
new file mode 100644
index 000000000..d4e863142
--- /dev/null
+++ b/packages/webapi/test/offscreencanvas.js
@@ -0,0 +1,57 @@
+import { assert, test } from '../run/test.setup.js'
+import { polyfill } from '../mod.js'
+
+test(() => {
+	return [
+		{
+			name: 'Supports OffscreenCanvas',
+			test() {
+				const target = {}
+	
+				polyfill(target)
+	
+				assert.equal('OffscreenCanvas' in target, true)
+				assert.equal(typeof target['OffscreenCanvas'], 'function')
+			},
+		},
+		{
+			name: 'Supports new (width: number, height: number): OffscreenCanvas',
+			test() {
+				const target = {}
+	
+				polyfill(target)
+
+				const w = 640
+				const h = 480
+
+				const canvas = new target.OffscreenCanvas(w, h)
+
+				assert.equal(canvas.width, w)
+				assert.equal(canvas.height, h)
+			},
+		},
+		{
+			name: 'Supports OffscreenCanvas#getContext',
+			test() {
+				const target = {}
+	
+				polyfill(target)
+
+				const w = 640
+				const h = 480
+
+				const canvas = new target.OffscreenCanvas(w, h)
+
+				const context = canvas.getContext('2d')
+
+				assert.equal(context.canvas, canvas)
+
+				const imageData = context.createImageData(w, h)
+
+				assert.equal(imageData.width, w)
+				assert.equal(imageData.height, h)
+				assert.equal(imageData.data.length, w * h * 4)
+			},
+		},
+	]
+})