Which @angular/* package(s) are relevant/related to the feature request?

core

Description

Given the following simple directive with a signal input:

@Directive({
  selector: '[appSimple]',
  standalone: true,
  host: {
    '(click)': 'doSomething()',
  }
})
export class SimpleDirective {
  data = input.required<string>();

  doSomething() {
    console.log(this.data());
  }
}

There is no way for me to write a test because I can not create a "DirectiveFixture" where I can "setInput"

Proposed solution

Provide a similar approach as TestBed.compileComponents but for directives.

Alternatives considered

Stick with requiring wrapper components to test, but add documentation when input signals become available as part of the public API.