Added unit tests for the readCollection method of the ImageMagick class.

Author: dlemstra

tests/image-magick/read-collection.spec.ts

@@ -0,0 +1,81 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.WASM.
+// Licensed under the Apache License, Version 2.0.
+
+import { ImageMagick } from '../../src/image-magick';
+import { MagickReadSettings } from '../../src/settings/magick-read-settings';
+import { TestFiles } from '../test-files';
+import * as fs from 'fs';
+import * as util from 'util';
+import { MagickFormat } from '../../src/magick-format';
+
+beforeAll(() => { ImageMagick._api = (global as any).native; });
+
+describe('ImageMagick#readCollection', () => {
+    it('should read built-in image async', async () => {
+        await ImageMagick.readCollection('logo:', async (images) => {
+            expect(images.length).toBe(1);
+            expect(images[0].width).toBe(640);
+            expect(images[0].height).toBe(480);
+        });
+    });
+
+    it('should read built-in image', () => {
+        ImageMagick.readCollection('wizard:', (images) => {
+            expect(images.length).toBe(1);
+            expect(images[0].width).toBe(480);
+            expect(images[0].height).toBe(640);
+        });
+    });
+
+    it('should read image from array async', async () => {
+        const readFile = util.promisify(fs.readFile);
+        const data = await readFile(TestFiles.roseSparkleGif);
+        await ImageMagick.readCollection(data, (images) => {
+            expect(images.length).toBe(3);
+            images.forEach(image => {
+                expect(image.width).toBe(70);
+                expect(image.height).toBe(46);
+            });
+        });
+    });
+
+    it('should read image from array', () => {
+        const data = fs.readFileSync(TestFiles.roseSparkleGif);
+        ImageMagick.readCollection(data, (images) => {
+            expect(images.length).toBe(3);
+            images.forEach(image => {
+                expect(image.width).toBe(70);
+                expect(image.height).toBe(46);
+            });
+        });
+    });
+
+    it('should read image from array with settings async', async () => {
+        const settings = new MagickReadSettings(
+        {
+            format: MagickFormat.Png
+        });
+
+        const readFile = util.promisify(fs.readFile);
+        const data = await readFile(TestFiles.roseSparkleGif);
+        await expect(async () => {
+            await ImageMagick.readCollection(data, settings, () => {
+                // will never be reached
+            });
+        }).rejects.toThrowError('ImproperImageHeader');
+    });
+
+    it('should read image from array with settings', () => {
+        const settings = new MagickReadSettings(
+        {
+            format: MagickFormat.Png
+        });
+
+        const data = fs.readFileSync(TestFiles.roseSparkleGif);
+        expect(() => {
+            ImageMagick.readCollection(data, settings, () => {
+                // will never be reached
+            });
+        }).toThrowError('ImproperImageHeader');
+    });
+});