Add image-tag model

Author: webbertakken

src/model/image-tag.js

@@ -0,0 +1,31 @@
+import { trimStart } from 'lodash-es';
+
+class ImageTag {
+  constructor({ version }) {
+    if (!ImageTag.versionPattern.test(version)) {
+      throw new Error(`Invalid version "${version}".`);
+    }
+
+    this.repository = 'gableroux';
+    this.name = 'unity3d';
+    this.version = version;
+  }
+
+  static get versionPattern() {
+    return /^20\d{2}\.\d\.\w{3,4}|3$/;
+  }
+
+  get tag() {
+    return this.version;
+  }
+
+  get image() {
+    return trimStart(`${this.repository}/${this.name}`, '/');
+  }
+
+  toString() {
+    return `${this.image}:${this.tag}`;
+  }
+}
+
+export default ImageTag;

src/model/image-tag.test.js

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+import ImageTag from './image-tag';
+
+describe('UnityImageVersion', () => {
+  describe('constructor', () => {
+    const some = {
+      version: '2020.0.00f0',
+    };
+
+    it('can be called', () => {
+      expect(() => new ImageTag(some)).not.toThrow();
+    });
+
+    it('accepts parameters and sets the right properties', () => {
+      const image = new ImageTag(some);
+
+      expect(image.repository).toStrictEqual('gableroux');
+      expect(image.name).toStrictEqual('unity3d');
+      expect(image.version).toStrictEqual(some.version);
+    });
+
+    test.each(['2000.0.0f0', '2011.1.11f1'])('accepts %p version format', version => {
+      expect(() => new ImageTag({ version })).not.toThrow();
+    });
+
+    test.each(['some version', '', 1, null])('throws for incorrect versions %p', version => {
+      expect(() => new ImageTag({ version })).toThrow();
+    });
+  });
+
+  describe('toString', () => {
+    it('returns the correct version', () => {
+      const image = new ImageTag({ version: '2099.1.1111' });
+
+      expect(image.toString()).toStrictEqual(`gableroux/unity3d:2099.1.1111`);
+    });
+  });
+});