maplibre-gl/src/style-spec/expression/expression.test.ts

BSD licensed community fork of mapbox-gl, a WebGL interactive maps library

import {createPropertyExpression, Feature, GlobalProperties, StylePropertyExpression} from '../expression';
import definitions from './definitions';
import v8 from '../reference/v8.json';
import {StylePropertySpecification} from '../style-spec';
import ParsingError from './parsing_error';

// filter out interal "error" and "filter-*" expressions from definition list
const filterExpressionRegex = /filter-/;
const definitionList = Object.keys(definitions).filter((expression) => {
    return expression !== 'error' && !filterExpressionRegex.exec(expression);
}).sort();

describe('v8.json includes all definitions from style-spec', () => {
    const v8List = Object.keys(v8.expression_name.values);
    const v8SupportedList = v8List.filter((expression) => {
        //filter out expressions that are not supported in GL-JS
        return !!v8.expression_name.values[expression]['sdk-support']['basic functionality']['js'];
    });
    expect(definitionList).toEqual(v8SupportedList.sort());
});

describe('createPropertyExpression', () => {
    test('prohibits non-interpolable properties from using an "interpolate" expression', () => {
        const {result, value} = createPropertyExpression([
            'interpolate', ['linear'], ['zoom'], 0, 0, 10, 10
        ], {
            type: 'number',
            'property-type': 'data-constant',
            expression: {
                'interpolated': false,
                'parameters': ['zoom']
            }
        } as StylePropertySpecification);
        expect(result).toBe('error');
        expect((value as ParsingError[])).toHaveLength(1);
        expect(value[0].message).toBe('"interpolate" expressions cannot be used with this property');
    });

});

describe('evaluate expression', () => {
    test('warns and falls back to default for invalid enum values', () => {
        const {value} = createPropertyExpression(['get', 'x'], {
            type: 'enum',
            values: {a: {}, b: {}, c: {}},
            default: 'a',
            'property-type': 'data-driven',
            expression: {
                'interpolated': false,
                'parameters': ['zoom', 'feature']
            }
        } as any as StylePropertySpecification) as {value: StylePropertyExpression};

        jest.spyOn(console, 'warn').mockImplementation(() => { });

        expect(value.kind).toBe('source');

        expect(value.evaluate({} as GlobalProperties, {properties: {x: 'b'}} as any as Feature)).toBe('b');
        expect(value.evaluate({} as GlobalProperties, {properties: {x: 'invalid'}} as any as Feature)).toBe('a');
        expect(console.warn).toHaveBeenCalledWith('Expected value to be one of "a", "b", "c", but found "invalid" instead.');

    });

});