58 lines
1.4 KiB
TypeScript
58 lines
1.4 KiB
TypeScript
import {describe, expect, it} from 'vitest';
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import {Signal} from '../../src/wrapper.js';
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describe('Signal.State', () => {
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it('should work', () => {
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const stateSignal = new Signal.State(0);
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expect(stateSignal.get()).toEqual(0);
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stateSignal.set(10);
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expect(stateSignal.get()).toEqual(10);
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});
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describe('Comparison semantics', () => {
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it('should cache State by Object.is', () => {
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const state = new Signal.State(NaN);
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let calls = 0;
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const computed = new Signal.Computed(() => {
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calls++;
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return state.get();
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});
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expect(calls).toBe(0);
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expect(computed.get()).toBe(NaN);
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expect(calls).toBe(1);
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state.set(NaN);
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expect(computed.get()).toBe(NaN);
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expect(calls).toBe(1);
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});
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it('applies custom equality in State', () => {
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let ecalls = 0;
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const state = new Signal.State(1, {
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equals() {
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ecalls++;
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return false;
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},
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});
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let calls = 0;
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const computed = new Signal.Computed(() => {
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calls++;
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return state.get();
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});
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expect(calls).toBe(0);
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expect(ecalls).toBe(0);
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expect(computed.get()).toBe(1);
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expect(ecalls).toBe(0);
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expect(calls).toBe(1);
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state.set(1);
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expect(computed.get()).toBe(1);
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expect(ecalls).toBe(1);
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expect(calls).toBe(2);
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});
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});
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});
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