diff --git a/__tests__/get-latest-version.test.ts b/__tests__/get-latest-version.test.ts
new file mode 100644
index 0000000..fea6fc8
--- /dev/null
+++ b/__tests__/get-latest-version.test.ts
@@ -0,0 +1,64 @@
+import {getURL, getLatestVersion} from '../src/get-latest-version';
+import nock from 'nock';
+import {FetchError} from 'node-fetch';
+import {Tool} from '../src/constants';
+import jsonTestBrew from './data/brew.json';
+import jsonTestGithub from './data/github.json';
+
+beforeEach(() => {
+  jest.resetModules();
+});
+
+afterEach(() => {
+  nock.cleanAll();
+});
+
+describe('getURL()', () => {
+  test('return expected URL', () => {
+    const urlBrewExpected = `https://formulae.brew.sh/api/formula/${Tool.Repo}.json`;
+    const urlBrew: string = getURL(Tool.Org, Tool.Repo, 'brew');
+    expect(urlBrew).toMatch(urlBrewExpected);
+
+    const urlGithubExpected = `https://api.github.com/repos/${Tool.Org}/${Tool.Repo}/releases/latest`;
+    const urlGithub: string = getURL(Tool.Org, Tool.Repo, 'github');
+    expect(urlGithub).toMatch(urlGithubExpected);
+  });
+});
+
+describe('getLatestVersion()', () => {
+  test('return latest version via brew', async () => {
+    nock('https://formulae.brew.sh')
+      .get(`/api/formula/${Tool.Repo}.json`)
+      .reply(200, jsonTestBrew);
+
+    const versionLatest: string = await getLatestVersion(
+      Tool.Org,
+      Tool.Repo,
+      'brew'
+    );
+    expect(versionLatest).toMatch(Tool.TestVersionLatest);
+  });
+
+  test('return latest version via GitHub', async () => {
+    nock('https://api.github.com')
+      .get(`/repos/${Tool.Org}/${Tool.Repo}/releases/latest`)
+      .reply(200, jsonTestGithub);
+
+    const versionLatest: string = await getLatestVersion(
+      Tool.Org,
+      Tool.Repo,
+      'github'
+    );
+    expect(versionLatest).toMatch(Tool.TestVersionLatest);
+  });
+
+  test('return exception 404', async () => {
+    nock('https://formulae.brew.sh')
+      .get(`/api/formula/${Tool.Repo}.json`)
+      .reply(404);
+
+    await expect(
+      getLatestVersion(Tool.Org, Tool.Repo, 'brew')
+    ).rejects.toThrowError(FetchError);
+  });
+});
diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index c8f8d8f..311d564 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -56,7 +56,8 @@ describe('showVersion()', () => {
   });
 
   test('return not found', async () => {
-    result = await main.showVersion('gitgit', ['--version']);
-    expect(result.exitcode).not.toBe(0);
+    await expect(
+      main.showVersion('gitgit', ['--version'])
+    ).rejects.toThrowError(Error);
   });
 });
diff --git a/src/constants.ts b/src/constants.ts
index e305ca4..7078254 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -3,5 +3,7 @@ export enum Tool {
   Org = 'gohugoio',
   Repo = 'hugo',
   CmdName = 'hugo',
-  CmdOptVersion = 'version'
+  CmdOptVersion = 'version',
+  TestVersionLatest = '0.62.2',
+  TestVersionSpec = '0.61.0'
 }
diff --git a/src/get-latest-version.ts b/src/get-latest-version.ts
index e6f3c37..5922830 100644
--- a/src/get-latest-version.ts
+++ b/src/get-latest-version.ts
@@ -17,18 +17,14 @@ export async function getLatestVersion(
   repo: string,
   api: string
 ): Promise<string> {
-  try {
-    const url = getURL(org, repo, api);
-    const response = await fetch(url);
-    const json = await response.json();
-    let latestVersion = '';
-    if (api === 'brew') {
-      latestVersion = json.versions.stable;
-    } else if (api === 'github') {
-      latestVersion = json.tag_name;
-    }
-    return latestVersion;
-  } catch (e) {
-    return e;
+  const url = getURL(org, repo, api);
+  const response = await fetch(url);
+  const json = await response.json();
+  let latestVersion = '';
+  if (api === 'brew') {
+    latestVersion = json.versions.stable;
+  } else if (api === 'github') {
+    latestVersion = json.tag_name;
   }
+  return latestVersion;
 }
diff --git a/src/main.ts b/src/main.ts
index 20dd72d..50c5170 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -26,11 +26,7 @@ export async function showVersion(
     }
   };
 
-  try {
-    result.exitcode = await exec.exec(cmd, args, options);
-  } catch (e) {
-    return e;
-  }
+  result.exitcode = await exec.exec(cmd, args, options);
   core.debug(`command: ${cmd} ${args}`);
   core.debug(`exit code: ${result.exitcode}`);
   core.debug(`stdout: ${result.output}`);