Avatar defaults and colors

ts/test-electron/util/canvasToBlob_test.ts

@@ -2,12 +2,15 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 
 import { assert } from 'chai';
+import { IMAGE_JPEG, IMAGE_PNG } from '../../types/MIME';
+import { sniffImageMimeType } from '../../util/sniffImageMimeType';
 
 import { canvasToBlob } from '../../util/canvasToBlob';
 
 describe('canvasToBlob', () => {
-  it('converts a canvas to an Blob', async () => {
-    const canvas = document.createElement('canvas');
+  let canvas: HTMLCanvasElement;
+  beforeEach(() => {
+    canvas = document.createElement('canvas');
     canvas.width = 100;
     canvas.height = 200;
 
@@ -17,11 +20,27 @@ describe('canvasToBlob', () => {
     }
     context.fillStyle = '#ff9900';
     context.fillRect(10, 10, 20, 20);
+  });
 
+  it('converts a canvas to an Blob, JPEG by default', async () => {
     const result = await canvasToBlob(canvas);
 
+    assert.strictEqual(
+      sniffImageMimeType(await result.arrayBuffer()),
+      IMAGE_JPEG
+    );
+
     // These are just smoke tests.
     assert.instanceOf(result, Blob);
     assert.isAtLeast(result.size, 50);
   });
+
+  it('can convert a canvas to a PNG Blob', async () => {
+    const result = await canvasToBlob(canvas, IMAGE_PNG);
+
+    assert.strictEqual(
+      sniffImageMimeType(await result.arrayBuffer()),
+      IMAGE_PNG
+    );
+  });
 });