text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 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 indexOf = require( '@stdlib/utils/index-of' );
  var propertyNamesIn = require( './../lib' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.strictEqual( typeof propertyNamesIn, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function returns an array of an object\'s own and inherited property names', function test( t ) {
  	var expected;
  	var actual;
  	var obj;
  	var idx;
  	var i;
  
  	function Foo() {
  		this.beep = 'boop';
  		this.a = {
  			'b': 'c'
  		};
  		return this;
  	}
  
  	Foo.prototype.foo = [ 'bar' ];
  
  	obj = new Foo();
  
  	expected = [ 'beep', 'a', 'foo' ];
  	actual = propertyNamesIn( obj );
  
  	for ( i = 0; i < expected.length; i++ ) {
  		idx = indexOf( actual, expected[ i ] );
  		t.strictEqual( idx !== -1, true, 'contains property name: '+expected[i] );
  	}
  	t.end();
  });
  
  tape( 'the function returns an empty array if provided `null` or `undefined`', function test( t ) {
  	var expected;
  	var actual;
  	var values;
  	var i;
  
  	values = [
  		void 0,
  		null
  	];
  	expected = [];
  
  	for ( i = 0; i < values.length; i++ ) {
  		actual = propertyNamesIn( values[ i ] );
  		t.deepEqual( actual, expected, 'returns expected value when provided '+values[ i ] );
  	}
  	t.end();
  });
  