diff --git a/jest.config.js b/jest.config.js
index d8cf9bde..87e110a8 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,19 +1,18 @@
 module.exports = {
   coverageDirectory: '<rootDir>/coverage',
   collectCoverageFrom: [
-    'src/**/*.{js,ts,tsx}',
-    '!src/registerServiceWorker.js',
-    '!src/index.ts',
+    'src/**/*.{ts,tsx}',
+    '!src/*.{ts,tsx}',
     '!src/reducers/index.ts',
     '!src/**/provideServices.ts',
     '!src/container/*.ts',
   ],
   coverageThreshold: {
     global: {
+      statements: 80,
       branches: 80,
       functions: 80,
       lines: 80,
-      statements: 80,
     },
   },
   resolver: 'jest-pnp-resolver',
diff --git a/test/common/services/ImageDownloader.test.ts b/test/common/services/ImageDownloader.test.ts
new file mode 100644
index 00000000..185625ce
--- /dev/null
+++ b/test/common/services/ImageDownloader.test.ts
@@ -0,0 +1,25 @@
+import { Mock } from 'ts-mockery';
+import { AxiosInstance } from 'axios';
+import { ImageDownloader } from '../../../src/common/services/ImageDownloader';
+import { windowMock } from '../../mocks/WindowMock';
+
+describe('ImageDownloader', () => {
+  const get = jest.fn();
+  const axios = Mock.of<AxiosInstance>({ get });
+  let imageDownloader: ImageDownloader;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    (global as any).URL = { createObjectURL: () => '' };
+
+    imageDownloader = new ImageDownloader(axios, windowMock);
+  });
+
+  test('calls URL with response type blob', async () => {
+    get.mockResolvedValue({ data: {} });
+
+    await imageDownloader.saveImage('/foo/bar.png', 'my-image.png');
+
+    expect(get).toHaveBeenCalledWith('/foo/bar.png', { responseType: 'blob' });
+  });
+});
diff --git a/test/mocks/WindowMock.ts b/test/mocks/WindowMock.ts
new file mode 100644
index 00000000..69cb1f4e
--- /dev/null
+++ b/test/mocks/WindowMock.ts
@@ -0,0 +1,18 @@
+import { Mock } from 'ts-mockery';
+
+const createLinkMock = () => ({
+  setAttribute: jest.fn(),
+  click: jest.fn(),
+  style: {},
+});
+
+export const appendChild = jest.fn();
+
+export const removeChild = jest.fn();
+
+export const windowMock = Mock.of<Window>({
+  document: {
+    createElement: jest.fn(createLinkMock),
+    body: { appendChild, removeChild },
+  },
+});
diff --git a/test/servers/services/ServersExporter.test.ts b/test/servers/services/ServersExporter.test.ts
index cf0fd386..fc990b1a 100644
--- a/test/servers/services/ServersExporter.test.ts
+++ b/test/servers/services/ServersExporter.test.ts
@@ -2,21 +2,9 @@ import { Mock } from 'ts-mockery';
 import { CsvJson } from 'csvjson';
 import ServersExporter from '../../../src/servers/services/ServersExporter';
 import LocalStorage from '../../../src/utils/services/LocalStorage';
+import { appendChild, removeChild, windowMock } from '../../mocks/WindowMock';
 
 describe('ServersExporter', () => {
-  const createLinkMock = () => ({
-    setAttribute: jest.fn(),
-    click: jest.fn(),
-    style: {},
-  });
-  const appendChild = jest.fn();
-  const removeChild = jest.fn();
-  const windowMock = Mock.of<Window>({
-    document: {
-      createElement: jest.fn(createLinkMock),
-      body: { appendChild, removeChild },
-    },
-  });
   const storageMock = Mock.of<LocalStorage>({
     get: jest.fn(() => ({
       abc123: {
diff --git a/test/visits/charts/DoughnutChart.test.tsx b/test/visits/charts/DoughnutChart.test.tsx
index 5868aeb3..e216fb38 100644
--- a/test/visits/charts/DoughnutChart.test.tsx
+++ b/test/visits/charts/DoughnutChart.test.tsx
@@ -3,7 +3,7 @@ import { Doughnut } from 'react-chartjs-2';
 import { keys, values } from 'ramda';
 import { DoughnutChart } from '../../../src/visits/charts/DoughnutChart';
 
-describe.skip('<DoughnutChart />', () => {
+describe('<DoughnutChart />', () => {
   let wrapper: ShallowWrapper;
   const stats = {
     foo: 123,
diff --git a/test/visits/charts/HorizontalBarChart.test.tsx b/test/visits/charts/HorizontalBarChart.test.tsx
index d830e4fc..346dc822 100644
--- a/test/visits/charts/HorizontalBarChart.test.tsx
+++ b/test/visits/charts/HorizontalBarChart.test.tsx
@@ -4,7 +4,7 @@ import { prettify } from '../../../src/utils/helpers/numbers';
 import { MAIN_COLOR, MAIN_COLOR_ALPHA } from '../../../src/utils/theme';
 import { HorizontalBarChart } from '../../../src/visits/charts/HorizontalBarChart';
 
-describe.skip('<HorizontalBarChart />', () => {
+describe('<HorizontalBarChart />', () => {
   let wrapper: ShallowWrapper;
   const stats = {
     foo: 123,
@@ -16,7 +16,6 @@ describe.skip('<HorizontalBarChart />', () => {
   it('renders Bar with expected properties', () => {
     wrapper = shallow(<HorizontalBarChart stats={stats} />);
     const horizontal = wrapper.find(Bar);
-    const cols = wrapper.find('.col-sm-12');
 
     expect(horizontal).toHaveLength(1);
 
@@ -37,7 +36,6 @@ describe.skip('<HorizontalBarChart />', () => {
       },
       y: { stacked: true },
     });
-    expect(cols).toHaveLength(1);
   });
 
   it.each([
diff --git a/test/visits/services/VisitsExporter.test.ts b/test/visits/services/VisitsExporter.test.ts
index da91fd78..40a34600 100644
--- a/test/visits/services/VisitsExporter.test.ts
+++ b/test/visits/services/VisitsExporter.test.ts
@@ -2,19 +2,9 @@ import { Mock } from 'ts-mockery';
 import { CsvJson } from 'csvjson';
 import { VisitsExporter } from '../../../src/visits/services/VisitsExporter';
 import { NormalizedVisit } from '../../../src/visits/types';
+import { windowMock } from '../../mocks/WindowMock';
 
 describe('VisitsExporter', () => {
-  const createLinkMock = () => ({
-    setAttribute: jest.fn(),
-    click: jest.fn(),
-    style: {},
-  });
-  const windowMock = Mock.of<Window>({
-    document: {
-      createElement: jest.fn(createLinkMock),
-      body: { appendChild: jest.fn(), removeChild: jest.fn() },
-    },
-  });
   const toCSV = jest.fn();
   const csvToJsonMock = Mock.of<CsvJson>({ toCSV });
   let exporter: VisitsExporter;