Index: node_modules/simple-update-notifier/src/getDistVersion.spec.ts
===================================================================
--- node_modules/simple-update-notifier/src/getDistVersion.spec.ts	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/simple-update-notifier/src/getDistVersion.spec.ts	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,35 @@
+import Stream from 'stream';
+import https from 'https';
+import getDistVersion from './getDistVersion';
+
+jest.mock('https', () => ({
+  get: jest.fn(),
+}));
+
+test('Valid response returns version', async () => {
+  const st = new Stream();
+  (https.get as jest.Mock).mockImplementation((url, cb) => {
+    cb(st);
+
+    st.emit('data', '{"latest":"1.0.0"}');
+    st.emit('end');
+  });
+
+  const version = await getDistVersion('test', 'latest');
+
+  expect(version).toEqual('1.0.0');
+});
+
+test('Invalid response throws error', async () => {
+  const st = new Stream();
+  (https.get as jest.Mock).mockImplementation((url, cb) => {
+    cb(st);
+
+    st.emit('data', 'some invalid json');
+    st.emit('end');
+  });
+
+  expect(getDistVersion('test', 'latest')).rejects.toThrow(
+    'Could not parse version response'
+  );
+});