diff --git a/src/version.test.ts b/src/version.test.ts
new file mode 100644
index 0000000..32cbf71
--- /dev/null
+++ b/src/version.test.ts
@@ -0,0 +1,63 @@
+import * as core from '@actions/core';
+import {Agent, MockAgent, setGlobalDispatcher} from 'undici';
+import versionInfo from './version';
+
+const mockAgent = new MockAgent();
+
+beforeAll(() => {
+  setGlobalDispatcher(mockAgent);
+  mockAgent.disableNetConnect();
+});
+
+afterEach(() => {
+  jest.clearAllMocks();
+});
+
+afterAll(async () => {
+  await mockAgent.close();
+  setGlobalDispatcher(new Agent());
+});
+
+describe('versionInfo', () => {
+  const platform = 'linux';
+
+  test('should resolve requested version info', async () => {
+    const version = 'latest';
+    const coreInfoSpy = jest.spyOn(core, 'info');
+
+    mockAgent
+        .get('https://cli.codecov.io')
+        .intercept({
+          path: `/${platform}/${version}`,
+        })
+        .reply(200, {
+          version: 'v0.5.2',
+        });
+
+    await versionInfo(platform, version);
+
+    expect(coreInfoSpy).toHaveBeenCalledTimes(2);
+    expect(coreInfoSpy).toHaveBeenCalledWith('==> Running version latest');
+    expect(coreInfoSpy).toHaveBeenCalledWith('==> Running version v0.5.2');
+  });
+
+  test('should handle unsupported version', async () => {
+    const version = 'unsupported';
+    const coreInfoSpy = jest.spyOn(core, 'info');
+
+    mockAgent
+        .get('https://cli.codecov.io')
+        .intercept({
+          path: `/${platform}/${version}`,
+        })
+        .reply(404, 'MESSAGE');
+
+    await versionInfo(platform, version);
+
+    expect(coreInfoSpy).toHaveBeenCalledTimes(2);
+    expect(coreInfoSpy).toHaveBeenCalledWith('==> Running version unsupported');
+    expect(coreInfoSpy).toHaveBeenCalledWith(
+        'Could not pull latest version information: SyntaxError: Unexpected token \'M\', "MESSAGE" is not valid JSON',
+    );
+  });
+});