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

a specification for maplibre styles

import {validate} from './validate';
import {validateTerrain} from './validate_terrain';
import v8 from '../reference/v8.json' with {type: 'json'};
import {describe, test, expect} from 'vitest';
describe('Validate Terrain', () => {
    test('Should return error in case terrain is not an object', () => {
        const errors = validateTerrain({
            validateSpec: validate,
            value: 1 as any,
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(1);
        expect(errors[0].message).toContain('number');
        expect(errors[0].message).toContain('object');
        expect(errors[0].message).toContain('terrain');
    });

    test('Should return error in case terrain source is not a string', () => {
        const errors = validateTerrain({
            validateSpec: validate,
            value: {source: 1 as any},
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(1);
        expect(errors[0].message).toContain('number');
        expect(errors[0].message).toContain('string');
        expect(errors[0].message).toContain('source');
    });

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

    test('Should return errors according to spec violations', () => {
        const errors = validateTerrain({
            validateSpec: validate,
            value: {source: 1 as any, exaggeration: {} as any},
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(2);
        expect(errors[0].message).toContain('number');
        expect(errors[0].message).toContain('string');
        expect(errors[0].message).toContain('source');
        expect(errors[1].message).toContain('number');
        expect(errors[1].message).toContain('object');
        expect(errors[1].message).toContain('exaggeration');
    });

    test('Should pass if everything is according to spec', () => {
        const errors = validateTerrain({
            validateSpec: validate,
            value: {source: 'source-id', exaggeration: 0.2},
            styleSpec: v8,
            style: {} as any
        });
        expect(errors).toHaveLength(0);
    });
});