Implement versioning strategies in js 🧉

src/jest.setup.js

@@ -0,0 +1,15 @@
+expect.extend({
+  toBeEitherAFunctionOrAnObject(received) {
+    const type = typeof received;
+
+    const pass = ['object', 'function'].includes(type);
+    const message = `Expected a function or an object, received ${type}`;
+
+    return {
+      message,
+      pass,
+    };
+  },
+});
+
+jest.mock('./model/input');