diff --git a/src/components/ActionBar/ActionBar.test.tsx b/src/components/ActionBar/ActionBar.test.tsx
index 59cea7b..e227f45 100644
--- a/src/components/ActionBar/ActionBar.test.tsx
+++ b/src/components/ActionBar/ActionBar.test.tsx
@@ -44,7 +44,7 @@ describe('<ActionBar /> component', () => {
     const ActionBar = require('./ActionBar').default;
     const wrapper = shallow(<ActionBar />);
     // FIXME: this only renders the DetailContextConsumer, thus
-    // the wrapper will be 
+    // the wrapper will be always empty
     expect(wrapper.html()).toEqual('');
   });
 
diff --git a/src/utils/api.test.ts b/src/utils/api.test.ts
new file mode 100644
index 0000000..bf5824b
--- /dev/null
+++ b/src/utils/api.test.ts
@@ -0,0 +1,28 @@
+/* eslint-disable @typescript-eslint/no-object-literal-type-assertion */
+
+import { handleResponseType } from '../../src/utils/api';
+
+describe('api', () => {
+  // no the best mock, but I'd look for a mock library to work with fetch in the future
+  // @ts-ignore
+  const headers: Headers = {
+    // @ts-ignore
+    get: () => [],
+  };
+
+  describe('handleResponseType', () => {
+    test('should test tgz scenario', async () => {
+      const blob = new Blob(['foo']);
+      const blobPromise = Promise.resolve<Blob>(blob);
+      const response: Response = {
+        url: 'http://localhost:8080/bootstrap/-/bootstrap-4.3.1.tgz',
+        blob: () => blobPromise,
+        ok: true,
+        headers,
+      } as Response;
+      const handled = await handleResponseType(response);
+
+      expect(handled).toEqual([true, blob]);
+    });
+  });
+});
diff --git a/src/utils/api.ts b/src/utils/api.ts
index c869881..3d95a5e 100644
--- a/src/utils/api.ts
+++ b/src/utils/api.ts
@@ -6,7 +6,7 @@ import '../../types';
  * @param {object} response
  * @returns {promise}
  */
-function handleResponseType(response: Response): Promise<[boolean, Blob | string]> | Promise<void> {
+export function handleResponseType(response: Response): Promise<[boolean, Blob | string]> | Promise<void> {
   if (response.headers) {
     const contentType = response.headers.get('Content-Type') as string;
     if (contentType.includes('application/pdf')) {
@@ -21,7 +21,7 @@ function handleResponseType(response: Response): Promise<[boolean, Blob | string
     }
 
     // unfortunatelly on download files there is no header available
-    if (response.url && response.url.match(/.tgz/) !== null) {
+    if (response.url && response.url.endsWith('.tgz') !== null) {
       return Promise.all([response.ok, response.blob()]);
     }
   }