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 invert = require( './../lib' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.equal( typeof invert, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function throws an error if not provided an object-like value', function test( t ) {
  	var values;
  	var i;
  
  	values = [
  		'5',
  		5,
  		NaN,
  		true,
  		false,
  		null,
  		undefined,
  		function noop() {}
  	];
  
  	for ( i = 0; i < values.length; i++ ) {
  		t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );
  	}
  	t.end();
  
  	function badValue( value ) {
  		return function badValue() {
  			invert( value );
  		};
  	}
  });
  
  tape( 'the function throws an error if provided an options argument which is not an object', function test( t ) {
  	var values;
  	var i;
  
  	values = [
  		'5',
  		5,
  		NaN,
  		true,
  		false,
  		null,
  		undefined,
  		[],
  		function noop() {}
  	];
  
  	for ( i = 0; i < values.length; i++ ) {
  		t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );
  	}
  	t.end();
  
  	function badValue( value ) {
  		return function badValue() {
  			invert( {}, value );
  		};
  	}
  });
  
  tape( 'the function throws an error if provided a duplicates option which is not a boolean primitive', function test( t ) {
  	var values;
  	var i;
  
  	values = [
  		'5',
  		5,
  		NaN,
  		null,
  		undefined,
  		[],
  		{},
  		function noop() {}
  	];
  
  	for ( i = 0; i < values.length; i++ ) {
  		t.throws( badValue( values[i] ), TypeError, 'throws an error when provided '+values[i] );
  	}
  	t.end();
  
  	function badValue( value ) {
  		return function badValue() {
  			invert( {}, {
  				'duplicates': value
  			});
  		};
  	}
  });
  
  tape( 'the function returns an empty object if provided an empty object', function test( t ) {
  	t.deepEqual( invert( {} ), {}, 'returns empty object' );
  	t.end();
  });
  
  tape( 'the function inverts an object', function test( t ) {
  	var expected;
  	var actual;
  	var obj;
  
  	obj = {
  		'a': 'beep',
  		'b': 'boop',
  		'c': true,
  		'd': null,
  		'e': [ 1, 2, 3 ],
  		'f': {
  			'a': 'b'
  		},
  		'g': 1
  	};
  	expected = {
  		'beep': 'a',
  		'boop': 'b',
  		'true': 'c',
  		'null': 'd',
  		'1,2,3': 'e',
  		'[object Object]': 'f',
  		'1': 'g'
  	};
  
  	actual = invert( obj );
  	t.deepEqual( actual, expected, 'returns inverted object' );
  	t.end();
  });
  
  tape( 'the function handles duplicate values', function test( t ) {
  	var expected;
  	var actual;
  	var obj;
  
  	obj = {
  		'a': 'beep',
  		'b': 'beep',
  		'c': 'boop',
  		'd': 'boop',
  		'e': 'boop'
  	};
  	expected = {
  		'beep': [ 'a', 'b' ],
  		'boop': [ 'c', 'd', 'e' ]
  	};
  	actual = invert( obj );
  
  	t.deepEqual( actual, expected, 'returns inverted object' );
  	t.end();
  });
  
  tape( 'the function supports overriding duplicate values', function test( t ) {
  	var expected;
  	var actual;
  	var obj;
  
  	obj = {
  		'a': 'beep',
  		'b': 'beep'
  	};
  	expected = {
  		'beep': 'b'
  	};
  	actual = invert( obj, {
  		'duplicates': false
  	});
  
  	t.deepEqual( actual, expected, 'returns inverted object' );
  	t.end();
  });
  
  tape( 'the function ignores unknown options', function test( t ) {
  	var expected;
  	var actual;
  	var obj;
  
  	obj = {
  		'a': 'beep',
  		'b': 'beep'
  	};
  	expected = {
  		'beep': [ 'a', 'b' ]
  	};
  	actual = invert( obj, {
  		'bee': 'bop'
  	});
  
  	t.deepEqual( actual, expected, 'ignores unknown options' );
  	t.end();
  });
  