Version as Clean Architecture

test/background/repositories/version.js

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+import VersionRepository from 'background/repositories/version';
+
+describe("background/repositories/version", () => {
+  let versionRepository;
+
+  beforeEach(() => {
+    versionRepository = new VersionRepository;
+  });
+
+  describe('#get', () => {
+    beforeEach(() => {
+      return browser.storage.local.remove('version');
+    });
+
+    it('loads saved version', async() => {
+      await browser.storage.local.set({ version: '1.2.3' });
+      let version = await this.versionRepository.get();
+      expect(version).to.equal('1.2.3');
+    });
+
+    it('returns undefined if no versions in storage', async() => {
+      let version = await storage.load();
+      expect(version).to.be.a('undefined');
+    });
+  });
+
+  describe('#update', () => {
+    it('saves version string', async() => {
+      await versionRepository.update('2.3.4');
+      let { version } = await browser.storage.local.get('version');
+      expect(version).to.equal('2.3.4');
+    });
+  });
+});