QUnit.test('Array#join', assert => { assert.isFunction(join); assert.strictEqual(join([1, 2, 3], undefined), '1,2,3'); assert.strictEqual(join('123'), '1,2,3'); assert.strictEqual(join('123', '|'), '1|2|3'); if (STRICT) { assert.throws(() => join(null), TypeError); assert.throws(() => join(undefined), TypeError); } });
assert.throws(() => join(undefined), TypeError);
assert.throws(() => join(null), TypeError);