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import { isSignal, untracked } from '@angular/core'
import { SIGNAL, signalSetFn } from '@angular/core/primitives/signals'
import { expect } from 'vitest'
import type { InputSignal, Signal } from '@angular/core'
import type { ComponentFixture } from '@angular/core/testing'
/* eslint jsdoc/require-jsdoc: 0, jsdoc/require-param: 0 */
// Evaluate all signals on an object and return the result
function evaluateSignals<T extends Record<string, any>>(
obj: T,
): { [K in keyof T]: ReturnType<T[K]> } {
const result: Partial<{ [K in keyof T]: ReturnType<T[K]> }> = {}
untracked(() => {
for (const key in obj) {
if (
Object.prototype.hasOwnProperty.call(obj, key) &&
// Only evaluate signals, not normal functions
isSignal(obj[key])
) {
const func = obj[key]
result[key] = func()
}
}
})
return result as { [K in keyof T]: ReturnType<T[K]> }
}
export const expectSignals = <T extends Record<string, any>>(
obj: T,
expected: Partial<{
[K in keyof T]: T[K] extends Signal<any> ? ReturnType<T[K]> : never
}>,
): void => {
expect(evaluateSignals(obj)).toMatchObject(expected)
}
type ToSignalInputUpdatableMap<T> = {
[K in keyof T as T[K] extends InputSignal<any>
? K
: never]: T[K] extends InputSignal<infer Value> ? Value : never
}
function componentHasSignalInputProperty<TProperty extends string>(
component: object,
property: TProperty,
): component is { [key in TProperty]: InputSignal<unknown> } {
return (
component.hasOwnProperty(property) && (component as any)[property][SIGNAL]
)
}
/**
* Set required signal input value to component fixture
* @see https://github.com/angular/angular/issues/54013
*/
export function setSignalInputs<T extends NonNullable<unknown>>(
component: T,
inputs: ToSignalInputUpdatableMap<T>,
) {
for (const inputKey in inputs) {
if (componentHasSignalInputProperty(component, inputKey)) {
signalSetFn(component[inputKey][SIGNAL], inputs[inputKey])
}
}
}
export function setFixtureSignalInputs<T extends NonNullable<unknown>>(
componentFixture: ComponentFixture<T>,
inputs: ToSignalInputUpdatableMap<T>,
options: { detectChanges: boolean } = { detectChanges: true },
) {
setSignalInputs(componentFixture.componentInstance, inputs)
if (options.detectChanges) {
componentFixture.detectChanges()
}
}
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