48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
const test = require('node:test');
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const assert = require('node:assert/strict');
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const { initialState, mergeState } = require('../state');
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test('initialState has the expected shape', () => {
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assert.deepEqual(initialState, {
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title: '',
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artist: '',
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album: '',
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albumArt: '',
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isPlaying: false,
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progress: 0,
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duration: 0,
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});
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});
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test('mergeState applies a single field update', () => {
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const next = mergeState(initialState, { title: 'Foo' });
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assert.equal(next.title, 'Foo');
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});
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test('mergeState preserves fields not present in the update', () => {
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const current = { ...initialState, title: 'Old', artist: 'Bar' };
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const next = mergeState(current, { title: 'New' });
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assert.equal(next.artist, 'Bar');
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});
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test('mergeState treats undefined fields as no-change', () => {
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const current = { ...initialState, isPlaying: true };
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const next = mergeState(current, { isPlaying: undefined });
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assert.equal(next.isPlaying, true);
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});
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test('mergeState applies false as a real value (not a no-change)', () => {
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const current = { ...initialState, isPlaying: true };
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const next = mergeState(current, { isPlaying: false });
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assert.equal(next.isPlaying, false);
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});
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test('mergeState does not mutate inputs', () => {
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const current = { ...initialState };
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const update = { title: 'X' };
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const before = { ...current };
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mergeState(current, update);
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assert.deepEqual(current, before);
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assert.deepEqual(update, { title: 'X' });
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});
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