source: frontend/node_modules/generator-function/test/index.js@ cdcff72

'use strict';

var test = require('tape');
var getProto = require('get-proto');
var semver = require('semver');

var getGeneratorFunction = require('generator-function');

test('getGeneratorFunction', function (t) {
        var result = getGeneratorFunction();

        /* eslint-env browser */
        if (typeof window === 'undefined' && typeof process !== 'undefined') {
                t.equal(
                        !!result,
                        semver.satisfies(process.version, '>= 1'),
                        'result is present or absent as expected for node ' + process.version
                );
        }

        t.test('exists', { skip: !result }, function (st) {
                if (result && getProto) { // TS can't infer `skip`, or that getProto definitely exists if GeneratorFunction exists
                        st.equal(typeof result, 'function', 'is a function');
                        st.equal(getProto(result), Function, 'extends Function');

                        var iterator = result('a', 'return a')(42);
                        st.deepEqual(iterator.next(), { value: 42, done: true }, 'returns a generator function which returns an iterator');
                } else {
                        st.fail('should never get here');
                }

                st.end();
        });

        t.test('does not exist', { skip: !!result }, function (st) {
                st.equal(result, false, 'is false');

                st.end();
        });

        t.end();
});