text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2019 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 randu = require( '@stdlib/random-iter-randu' );
  var array2iterator = require( '@stdlib/array-to-iterator' );
  var iteratorSymbol = require( '@stdlib/symbol-iterator' );
  var isnan = require( '@stdlib/math-base-assert-is-nan' );
  var itercurange = require( './../lib' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.equal( typeof itercurange, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function throws an error if provided an iterator argument which is not an iterator protocol-compliant 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() {
  			itercurange( value );
  		};
  	}
  });
  
  tape( 'the function returns an iterator protocol-compliant object which iteratively computes a cumulative range', function test( t ) {
  	var expected;
  	var actual;
  	var values;
  	var it;
  	var v;
  	var i;
  
  	values = [ 2.0, 3.0, 2.0, 4.0, 3.0, 4.0 ];
  	expected = [ 0.0, 1.0, 1.0, 2.0, 2.0, 2.0 ];
  
  	it = itercurange( array2iterator( values ) );
  	t.equal( it.next.length, 0, 'has zero arity' );
  
  	actual = [];
  	for ( i = 0; i < values.length; i++ ) {
  		v = it.next();
  		t.equal( typeof v.value, 'number', 'returns a number' );
  		t.equal( typeof v.done, 'boolean', 'returns a boolean' );
  		actual.push( v.value );
  	}
  	t.deepEqual( actual, expected, 'returns expected results' );
  
  	v = it.next();
  	t.equal( v.value, void 0, 'returns expected value' );
  	t.equal( v.done, true, 'returns expected value' );
  
  	t.end();
  });
  
  tape( 'if an iterated value is a non-numeric value, the computed range is `NaN`', function test( t ) {
  	var expected;
  	var values;
  	var it;
  	var v;
  	var i;
  
  	values = [ 1.0, 2.0, NaN, 3.0 ];
  	expected = [ 0.0, 1.0, NaN, NaN ];
  
  	it = itercurange( array2iterator( values ) );
  
  	for ( i = 0; i < values.length; i++ ) {
  		v = it.next();
  		if ( isnan( expected[ i ] ) ) {
  			t.equal( isnan( v.value ), true, 'returns expected value for iteration '+i );
  		} else {
  			t.equal( v.value, expected[ i ], 'returns expected value for iteration '+i );
  		}
  	}
  
  	values = [ 1.0, 2.0, 'beep', 3.0 ];
  	expected = [ 0.0, 1.0, NaN, NaN ];
  
  	it = itercurange( array2iterator( values ) );
  
  	for ( i = 0; i < values.length; i++ ) {
  		v = it.next();
  		if ( isnan( expected[ i ] ) ) {
  			t.equal( isnan( v.value ), true, 'returns expected value for iteration '+i );
  		} else {
  			t.equal( v.value, expected[ i ], 'returns expected value for iteration '+i );
  		}
  	}
  	t.end();
  });
  
  tape( 'the returned iterator has a `return` method for closing an iterator (no argument)', function test( t ) {
  	var it;
  	var r;
  
  	it = itercurange( randu() );
  
  	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 = itercurange( randu() );
  
  	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` and the provided iterator is iterable, the returned iterator is iterable', function test( t ) {
  	var itercurange;
  	var opts;
  	var rand;
  	var it1;
  	var it2;
  	var i;
  
  	itercurange = proxyquire( './../lib/main.js', {
  		'@stdlib/symbol-iterator': '__ITERATOR_SYMBOL__'
  	});
  
  	opts = {
  		'seed': 12345
  	};
  	rand = randu( opts );
  	rand[ '__ITERATOR_SYMBOL__' ] = factory;
  
  	it1 = itercurange( rand );
  	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 < 100; i++ ) {
  		t.equal( it2.next().value, it1.next().value, 'returns expected value' );
  	}
  	t.end();
  
  	function factory() {
  		return randu( opts );
  	}
  });
  
  tape( 'if an environment does not support `Symbol.iterator`, the returned iterator is not "iterable"', function test( t ) {
  	var itercurange;
  	var it;
  
  	itercurange = proxyquire( './../lib/main.js', {
  		'@stdlib/symbol-iterator': false
  	});
  
  	it = itercurange( randu() );
  	t.equal( it[ iteratorSymbol ], void 0, 'does not have property' );
  
  	t.end();
  });
  
  tape( 'if a provided iterator is not iterable, the returned iterator is not iterable', function test( t ) {
  	var itercurange;
  	var rand;
  	var it;
  
  	itercurange = proxyquire( './../lib/main.js', {
  		'@stdlib/symbol-iterator': '__ITERATOR_SYMBOL__'
  	});
  
  	rand = randu();
  	rand[ '__ITERATOR_SYMBOL__' ] = null;
  
  	it = itercurange( rand );
  	t.equal( it[ iteratorSymbol ], void 0, 'does not have property' );
  
  	t.end();
  });
  