@maplibre/maplibre-gl-style-spec/src/expression/types/number_array.test.ts

a specification for maplibre styles

import {NumberArray} from './number_array';
import {describe, test, expect} from 'vitest';
describe('NumberArray', () => {
    test('NumberArray.parse', () => {
        expect(NumberArray.parse()).toBeUndefined();
        expect(NumberArray.parse(null)).toBeUndefined();
        expect(NumberArray.parse(undefined)).toBeUndefined();
        expect(NumberArray.parse('Dennis' as any)).toBeUndefined();
        expect(NumberArray.parse('3' as any)).toBeUndefined();
        expect(NumberArray.parse([3, '4'] as any)).toBeUndefined();
        expect(NumberArray.parse(5).values).toEqual([5]);
        expect(NumberArray.parse([]).values).toEqual([]);
        expect(NumberArray.parse([1]).values).toEqual([1]);
        expect(NumberArray.parse([1, 2]).values).toEqual([1, 2]);
        expect(NumberArray.parse([1, 2, 3]).values).toEqual([1, 2, 3]);
        expect(NumberArray.parse([1, 2, 3, 4]).values).toEqual([1, 2, 3, 4]);
        expect(NumberArray.parse([1, 2, 3, 4, 5]).values).toEqual([1, 2, 3, 4, 5]);

        const passThru = new NumberArray([1, 2, 3, 4]);
        expect(NumberArray.parse(passThru)).toBe(passThru);
    });

    test('NumberArray#toString', () => {
        const numberArray = new NumberArray([1, 2, 3, 4]);
        expect(numberArray.toString()).toBe('[1,2,3,4]');
    });

    test('interpolate NumberArray', () => {
        const numberArray = new NumberArray([0, 0, 0, 0]);
        const targetNumberArray = new NumberArray([1, 2, 6, 4]);

        const i11nFn = (t: number) => NumberArray.interpolate(numberArray, targetNumberArray, t);
        expect(i11nFn(0.5)).toBeInstanceOf(NumberArray);
        expect(i11nFn(0.5).values).toEqual([0.5, 1, 3, 2]);
    });
});