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 defineProperty = require( '@stdlib/utils/define-property' );
  var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
  var Symbol = require( '@stdlib/symbol/ctor' );
  var propertySymbolsIn = require( './../lib' );
  
  
  // VARIABLES //
  
  var hasSymbols = hasSymbolSupport();
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.strictEqual( typeof propertySymbolsIn, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function returns an array of an object\'s own and inherited symbol properties', function test( t ) {
  	var expected;
  	var symbols;
  	var actual;
  	var obj;
  	var idx;
  	var i;
  
  	if ( hasSymbols ) {
  		symbols = [ Symbol( 'a' ), Symbol( 'b' ), Symbol( 'c' ) ];
  	} else {
  		symbols = [];
  	}
  
  	function Foo() {
  		if ( hasSymbols ) {
  			this[ symbols[ 0 ] ] = 0;
  			defineProperty( this, symbols[ 1 ], {
  				'configurable': false,
  				'enumerable': false,
  				'writable': false,
  				'value': 1
  			});
  		}
  		return this;
  	}
  
  	if ( hasSymbols ) {
  		Foo.prototype[ symbols[ 1 ] ] = '1';
  		defineProperty( Foo.prototype, symbols[ 2 ], {
  			'configurable': false,
  			'enumerable': false,
  			'writable': true,
  			'value': 2
  		});
  	}
  
  	obj = new Foo();
  
  	expected = symbols;
  	actual = propertySymbolsIn( obj );
  
  	t.strictEqual( actual.length, symbols.length, 'has expected length' );
  	for ( i = 0; i < expected.length; i++ ) {
  		idx = indexOf( actual, expected[ i ] );
  		t.strictEqual( idx !== -1, true, 'contains property symbol: '+expected[i].toString() );
  	}
  	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 = propertySymbolsIn( values[ i ] );
  		t.deepEqual( actual, expected, 'returns expected value when provided '+values[ i ] );
  	}
  	t.end();
  });
  