Couldn't get tests to work.

Expected behaviour:
Running `yarn test` runs all tests.

Actual behaviour
```
FAIL src/App.test.js
● Test suite failed to run

/mnt/C49EA2229EA20D4C/linux/source/js/itk-react-app/node_modules/vtk.js/Sources/Rendering/Core/Actor/index.js:1
({"Object.":function(module,exports,require,__dirname,__filename,global,jest){import { vec3, mat4 } from 'gl-matrix';
^^^^^^

SyntaxError: Cannot use import statement outside a module

3 | import './App.css';
4 |
> 5 | import vtkActor from 'vtk.js/Sources/Rendering/Core/Actor';
| ^
6 | import vtkSphereSource from 'vtk.js/Sources/Filters/Sources/SphereSource';
7 | import vtkMapper from 'vtk.js/Sources/Rendering/Core/Mapper';
8 | import vtkFullScreenRenderWindow from 'vtk.js/Sources/Rendering/Misc/FullScreenRenderWindow';

at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:537:17)
at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:579:25)
at Object. (src/App.js:5:1)
at Object. (src/App.test.js:3:1)

Test Suites: 1 failed, 1 total
Tests: 0 total
Snapshots: 0 total
Time: 30.337s
Ran all test suites.

Watch Usage
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› Press Enter to trigger a test run.

Done in 58.01s.
```

Any help with fixing this issue would be highly appreciated. Even simple hints to point me in the right direction (so that I can fix it myself) would be really helpful.