Angular 13 + jest + Angular library not working

From the looks of it, ngx-pipes does not yet publish an Ivy distribution and your project still needs ngcc before running the tests.

// package.json
{
  "scripts": {
    "test": "ngcc && ng test"
  }
}

> [email protected] test
> ngcc && ng test

Processing legacy "View Engine" libraries:
- ngx-pipes [fesm2015/esm2015] (https://github.com/danrevah/ngx-pipes.git)
- ngx-pipes [esm2015/esm2015] (https://github.com/danrevah/ngx-pipes.git)
- ngx-pipes [main/umd] (https://github.com/danrevah/ngx-pipes.git)
Encourage the library authors to publish an Ivy distribution.
 PASS  src/app/app.component.spec.ts
  AppComponent
    ✓ should create the app (163 ms)
    ✓ should have as title 'jest-tests' (46 ms)
    ✓ should render title (44 ms)
    ✓ should render shortened text (33 ms)

-------------------|---------|----------|---------|---------|-------------------
File               | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
-------------------|---------|----------|---------|---------|-------------------
All files          |     100 |      100 |     100 |     100 |                   
 ...component.html |     100 |      100 |     100 |     100 |                   
 app.component.ts  |     100 |      100 |     100 |     100 |                   
-------------------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        3.526 s, estimated 5 s
Ran all test suites.