text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2020 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 proxyquire = require( 'proxyquire' );
  var iteratorSymbol = require( '@stdlib/symbol/iterator' );
  var negalucas = require( '@stdlib/math/base/special/negalucas' );
  var iterNegaLucasSeq = require( './../lib' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.equal( typeof iterNegaLucasSeq, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function throws an error if provided a first argument which is not an object', function test( t ) {
  	var values;
  	var i;
  
  	values = [
  		'5',
  		5,
  		NaN,
  		true,
  		false,
  		null,
  		void 0,
  		[],
  		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() {
  			iterNegaLucasSeq( value );
  		};
  	}
  });
  
  tape( 'the function throws an error if provided an invalid option', function test( t ) {
  	var values;
  	var i;
  
  	values = [
  		'5',
  		-5,
  		3.14,
  		NaN,
  		true,
  		false,
  		null,
  		void 0,
  		[],
  		{},
  		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() {
  			iterNegaLucasSeq({
  				'iter': value
  			});
  		};
  	}
  });
  
  tape( 'the function returns an iterator protocol-compliant object which generates a negaLucas sequence', function test( t ) {
  	var expected;
  	var actual;
  	var it;
  	var i;
  
  	it = iterNegaLucasSeq();
  	t.equal( it.next.length, 0, 'has zero arity' );
  
  	for ( i = 0; i < 77; i++ ) {
  		actual = it.next();
  		expected = negalucas( -i );
  		t.equal( actual.value, expected, 'returns expected value' );
  		t.equal( actual.done, false, 'returns expected value' );
  	}
  	actual = it.next();
  	t.equal( actual.value, void 0, 'returns expected value' );
  	t.equal( actual.done, true, 'returns expected value' );
  	t.end();
  });
  
  tape( 'the function supports limiting the number of iterations', function test( t ) {
  	var expected;
  	var actual;
  	var opts;
  	var it;
  	var i;
  
  	expected = [
  		{
  			'value': 2,
  			'done': false
  		},
  		{
  			'value': -1,
  			'done': false
  		},
  		{
  			'value': 3,
  			'done': false
  		},
  		{
  			'value': -4,
  			'done': false
  		},
  		{
  			'done': true
  		}
  	];
  
  	opts = {
  		'iter': 4
  	};
  	it = iterNegaLucasSeq( opts );
  	t.equal( it.next.length, 0, 'has zero arity' );
  
  	actual = [];
  	for ( i = 0; i < opts.iter; i++ ) {
  		actual.push( it.next() );
  	}
  	actual.push( it.next() );
  
  	t.deepEqual( actual, expected, 'returns expected values' );
  	t.end();
  });
  
  tape( 'the returned iterator has a `return` method for closing an iterator (no argument)', function test( t ) {
  	var it;
  	var r;
  
  	it = iterNegaLucasSeq();
  
  	r = it.next();
  	t.equal( typeof r.value, 'number', 'returns a number' );
  	t.equal( r.done, false, 'returns expected value' );
  
  	r = it.next();
  	t.equal( typeof r.value, 'number', 'returns a number' );
  	t.equal( r.done, false, 'returns expected value' );
  
  	r = it.return();
  	t.equal( r.value, void 0, 'returns expected value' );
  	t.equal( r.done, true, 'returns expected value' );
  
  	r = it.next();
  	t.equal( r.value, void 0, 'returns expected value' );
  	t.equal( r.done, true, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'the returned iterator has a `return` method for closing an iterator (argument)', function test( t ) {
  	var it;
  	var r;
  
  	it = iterNegaLucasSeq();
  
  	r = it.next();
  	t.equal( typeof r.value, 'number', 'returns a number' );
  	t.equal( r.done, false, 'returns expected value' );
  
  	r = it.next();
  	t.equal( typeof r.value, 'number', 'returns a number' );
  	t.equal( r.done, false, 'returns expected value' );
  
  	r = it.return( 'finished' );
  	t.equal( r.value, 'finished', 'returns expected value' );
  	t.equal( r.done, true, 'returns expected value' );
  
  	r = it.next();
  	t.equal( r.value, void 0, 'returns expected value' );
  	t.equal( r.done, true, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'if an environment supports `Symbol.iterator`, the returned iterator is iterable', function test( t ) {
  	var iterNegaLucasSeq;
  	var it1;
  	var it2;
  	var i;
  
  	iterNegaLucasSeq = proxyquire( './../lib/main.js', {
  		'@stdlib/symbol/iterator': '__ITERATOR_SYMBOL__'
  	});
  
  	it1 = iterNegaLucasSeq();
  	t.equal( typeof it1[ '__ITERATOR_SYMBOL__' ], 'function', 'has method' );
  	t.equal( it1[ '__ITERATOR_SYMBOL__' ].length, 0, 'has zero arity' );
  
  	it2 = it1[ '__ITERATOR_SYMBOL__' ]();
  	t.equal( typeof it2, 'object', 'returns an object' );
  	t.equal( typeof it2.next, 'function', 'has method' );
  	t.equal( typeof it2.return, 'function', 'has method' );
  
  	for ( i = 0; i < 10; i++ ) {
  		t.equal( it2.next().value, it1.next().value, 'returns expected value' );
  	}
  	t.end();
  });
  
  tape( 'if an environment does not support `Symbol.iterator`, the returned iterator is not "iterable"', function test( t ) {
  	var iterNegaLucasSeq;
  	var it;
  
  	iterNegaLucasSeq = proxyquire( './../lib/main.js', {
  		'@stdlib/symbol/iterator': false
  	});
  
  	it = iterNegaLucasSeq();
  	t.equal( it[ iteratorSymbol ], void 0, 'does not have property' );
  
  	t.end();
  });
  