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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,38 @@ | ||
import { SpectatorPipe, createPipeFactory } from '@ngneat/spectator'; | ||
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import { StatsService } from './stats.service'; | ||
import { AlternatingSumPipe } from './alternating-sum.pipe'; | ||
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describe('AlternatingSumPipe', () => { | ||
let spectator: SpectatorPipe<AlternatingSumPipe>; | ||
const createPipe = createPipeFactory({ | ||
pipe: AlternatingSumPipe, | ||
template: `{{ prop | alternatingSum }}` | ||
}); | ||
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it('should compute the alternating sum of a given list of numbers (prop)', () => { | ||
spectator = createPipe({ | ||
hostProps: { | ||
prop: [1, 2, 3] | ||
} | ||
}); | ||
expect(spectator.element).toHaveText('2'); | ||
}); | ||
|
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it('should compute the alternating sum of a given list of numbers (template override)', () => { | ||
spectator = createPipe(`{{ [3, 4, 5] | alternatingSum }}`); | ||
expect(spectator.element).toHaveText('4'); | ||
}); | ||
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it('should delegate the computation to the service', () => { | ||
const alternatingSum = () => 42; | ||
const provider = { provide: StatsService, useValue: { alternatingSum } }; | ||
spectator = createPipe({ | ||
hostProps: { | ||
prop: [] | ||
}, | ||
providers: [provider] | ||
}); | ||
expect(spectator.element).toHaveText('42'); | ||
}); | ||
}); |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,14 @@ | ||
import { Pipe, PipeTransform } from '@angular/core'; | ||
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import { StatsService } from './stats.service'; | ||
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@Pipe({ | ||
name: 'alternatingSum' | ||
}) | ||
export class AlternatingSumPipe implements PipeTransform { | ||
constructor(private readonly statsService: StatsService) {} | ||
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public transform(value: number[]): number { | ||
return this.statsService.alternatingSum(value); | ||
} | ||
} |
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