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test/shared/versions/storage.test.js

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+import * as storage from 'shared/versions/storage';
+
+describe("shared/versions/storage", () => {
+  describe('#load', () => {
+    beforeEach(() => {
+      return browser.storage.local.remove('version');
+    });
+
+    it('loads saved version', () => {
+      return Promise.resolve().then(() => {
+        return browser.storage.local.set({ version: '1.2.3' });
+      }).then(() => {
+        return storage.load();
+      }).then((version) => {
+        expect(version).to.equal('1.2.3');
+      });
+    });
+
+    it('returns undefined if no versions in storage', () => {
+      return Promise.resolve().then(() => {
+        return storage.load();
+      }).then((version) => {
+        expect(version).to.be.a('undefined');
+      });
+    });
+  });
+
+  describe('#save', () => {
+    it('saves version string', () => {
+      return Promise.resolve().then(() => {
+        return storage.save('2.3.4');
+      }).then(() => {
+        return browser.storage.local.get('version');
+      }).then(({version}) => {
+        expect(version).to.equal('2.3.4');
+      });
+    });
+  });
+});