test.main.js

/**
* @license Apache-2.0
*
* Copyright (c) 2021 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

// MODULES //

var tape = require( 'tape' );
var reUtf16UnpairedSurrogate = require( './../lib/main.js' );


// TESTS //

tape( 'main export is a function', function test( t ) {
	t.ok( true, __filename );
	t.strictEqual( typeof reUtf16UnpairedSurrogate, 'function', 'main export is a function' );
	t.end();
});

tape( 'the function returns a regular expression that matches an unpaired UTF-16 surrogate', function test( t ) {
	var REGEXP = reUtf16UnpairedSurrogate();
	var values;
	var i;

	values = [
		'\uD800',
		'\uD801',
		'\uD802',
		'\uDBFF',
		'\uDC00',
		'\uDC01',
		'\uDFFE',
		'\uDFFF',
		'abc\uD800abc',
		'abc\uDFFFabc'
	];

	for ( i = 0; i < values.length; i++ ) {
		t.strictEqual( REGEXP.test( values[ i ] ), true, 'matches when provided '+values[i] );
	}
	t.end();
});

tape( 'the function returns a regular expression that does not match surrogate pairs', function test( t ) {
	var REGEXP = reUtf16UnpairedSurrogate();
	var values;
	var i;

	values = [
		'\uD800\uDC00',
		'\uD801\uDC01',
		'\uDBFF\uDFFF',
		'abc\uD800\uDC00abc'
	];

	for ( i = 0; i < values.length; i++ ) {
		t.strictEqual( REGEXP.test( values[ i ] ), false, 'does not match when provided '+values[i] );
	}
	t.end();
});

tape( 'the function returns a regular expression that does not match non-surrogates', function test( t ) {
	var REGEXP = reUtf16UnpairedSurrogate();
	var values;
	var i;

	values = [
		'a',
		'b',
		'c',
		'abc',
		'defgihjk'
	];

	for ( i = 0; i < values.length; i++ ) {
		t.strictEqual( REGEXP.test( values[ i ] ), false, 'does not match when provided '+values[i] );
	}
	t.end();
});