@maplibre/maplibre-gl-style-spec/src/validate/validate_projection.test.ts

a specification for maplibre styles

import {validateProjection} from './validate_projection';
import {validate} from './validate';
import v8 from '../reference/v8.json' with {type: 'json'};
import {ProjectionSpecification} from '../types.g';
import {describe, test, expect, it} from 'vitest';

describe('Validate projection', () => {
    it('Should pass when value is undefined', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: undefined,
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(0);
    });

    test('Should return error when value is not an object', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: '' as unknown as ProjectionSpecification,
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(1);
        expect(errors[0].message).toContain('object');
        expect(errors[0].message).toContain('expected');
    });

    test('Should return error in case of unknown property', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: {a: 1} as any,
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(1);
        expect(errors[0].message).toContain('a: unknown property \"a\"');
    });

    test('Should return errors according to spec violations', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: {type: 1 as any},
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(1);
        expect(errors[0].message).toBe('type: projection expected, invalid type \"number\" found');
    });

    test('Should return error when value is null', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: null as any,
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(1);
        expect(errors[0].message).toContain('projection: object expected, null found');
    });

    test('Should pass step function', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: {type: ['step', ['zoom'], 'vertical-perspective', 10, 'mercator']},
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(0);
    });

    test('Should pass string value', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: {type: 'mercator'},
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(0);
    });

    test('Should pass if [proj, proj, number]', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: {type: ['mercator', 'mercator', 0.3]},
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(0);
    });

    test('should parse interpolate', () => {
        const errors = validateProjection({
            validateSpec: validate,
            value: {
                type: [
                    'interpolate',
                    ['linear'],
                    ['zoom'],
                    0,
                    'mercator',
                    5,
                    'vertical-perspective'
                ]
            },
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(0);
    });
});