Simplify pages/menus/registry extension api internal implementation (#1364)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>
Co-authored-by: Roman <ixrock@gmail.com>

src/extensions/__tests__/lens-extension.test.ts

@@ -0,0 +1,23 @@
+import { LensExtension } from "../lens-extension"
+
+let ext: LensExtension = null
+
+describe("lens extension", () => {
+  beforeEach(async () => {
+    ext = new LensExtension({
+      manifest: {
+        name: "foo-bar",
+        version: "0.1.1"
+      },
+      manifestPath: "/this/is/fake/package.json",
+      isBundled: false,
+      isEnabled: true
+    })
+  })
+
+  describe("name", () => {
+    it("returns name", () => {
+      expect(ext.name).toBe("foo-bar")
+    })
+  })
+})