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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=0"> <link rel="stylesheet" href="../../../static/normalize.css" type="text/css" media="screen" /> <link rel="stylesheet" href="../../../static/main.css" type="text/css" media="screen" /> <link rel="shortcut icon" type="image/vnd.microsoft.icon" href="../../../static/bug-icon-black.ico"> <title>array-like - to be empty</title> </head> <body class="sidebar-hidden has-sidebar"> <header> <div class="logo-icon"></div> <nav> <ul> <li class="menu-toggle-item"> <button class="menu-toggle" onclick="toggleSidebar()"></button> </li> <li class=""><a href="../../..">Unexpected</a></li> <li class="active"><a href="../../any/to-be">Assertions</a></li> <li class=""><a href="../../../api/addAssertion">API</a></li> <li class=""><a href="../../../plugins">Plugins</a></li> </ul> </nav> <div class="search" style="visibility: hidden"> <input id="search" placeholder="Search..." value=""> <div id="searchDropDown" class="dropDown"> <ul id="searchResults"></ul> </div> </div> </header> <section id="assertions"> <nav id="assertion-menu" class="sidebar js-remember-scroll-position"> <ul> <li> <h3>any</h3> <ul> <li class=""> <a href="../../any/to-be">to be</a> </li> <li class=""> <a href="../../any/to-be-a">to be a</a> </li> <li class=""> <a href="../../any/to-be-defined">to be defined</a> </li> <li class=""> <a href="../../any/to-be-falsy">to be falsy</a> </li> <li class=""> <a href="../../any/to-be-null">to be null</a> </li> <li class=""> <a href="../../any/to-be-ok">to be ok</a> </li> <li class=""> <a href="../../any/to-be-truthy">to be truthy</a> </li> <li class=""> <a href="../../any/to-be-undefined">to be undefined</a> </li> <li class=""> <a href="../../any/to-equal">to equal</a> </li> <li class=""> <a href="../../any/to-satisfy">to satisfy</a> </li> <li class=""> <a href="../../any/when-passed-as-parameter-to">when passed as parameter to</a> </li> </ul> </li> <li> <h3>string</h3> <ul> <li class=""> <a href="../../string/to-be">to be</a> </li> <li class=""> <a href="../../string/to-be-empty">to be empty</a> </li> <li class=""> <a href="../../string/to-be-greater-than">to be greater than</a> </li> <li class=""> <a href="../../string/to-be-greater-than-or-equal-to">to be greater than or equal to</a> </li> <li class=""> <a href="../../string/to-be-less-than">to be less than</a> </li> <li class=""> <a href="../../string/to-be-less-than-or-equal-to">to be less than or equal to</a> </li> <li class=""> <a href="../../string/to-be-non-empty">to be non-empty</a> </li> <li class=""> <a href="../../string/to-be-within">to be within</a> </li> <li class=""> <a href="../../string/to-begin-with">to begin with</a> </li> <li class=""> <a href="../../string/to-contain">to contain</a> </li> <li class=""> <a href="../../string/to-end-with">to end with</a> </li> <li class=""> <a href="../../string/to-have-length">to have length</a> </li> <li class=""> <a href="../../string/to-match">to match</a> </li> </ul> </li> <li> <h3>number</h3> <ul> <li class=""> <a href="../../number/to-be-close-to">to be close to</a> </li> <li class=""> <a href="../../number/to-be-finite">to be finite</a> </li> <li class=""> <a href="../../number/to-be-greater-than">to be greater than</a> </li> <li class=""> <a href="../../number/to-be-greater-than-or-equal-to">to be greater than or equal to</a> </li> <li class=""> <a href="../../number/to-be-infinite">to be infinite</a> </li> <li class=""> <a href="../../number/to-be-less-than">to be less than</a> </li> <li class=""> <a href="../../number/to-be-less-than-or-equal-to">to be less than or equal to</a> </li> <li class=""> <a href="../../number/to-be-NaN">to be NaN</a> </li> <li class=""> <a href="../../number/to-be-negative">to be negative</a> </li> <li class=""> <a href="../../number/to-be-positive">to be positive</a> </li> <li class=""> <a href="../../number/to-be-within">to be within</a> </li> </ul> </li> <li> <h3>boolean</h3> <ul> <li class=""> <a href="../../boolean/to-be-false">to be false</a> </li> <li class=""> <a href="../../boolean/to-be-true">to be true</a> </li> </ul> </li> <li> <h3>object</h3> <ul> <li class=""> <a href="../../object/to-be-canonical">to be canonical</a> </li> <li class=""> <a href="../../object/to-have-key">to have key</a> </li> <li class=""> <a href="../../object/to-have-keys">to have keys</a> </li> <li class=""> <a href="../../object/to-have-keys-satisfying">to have keys satisfying</a> </li> <li class=""> <a href="../../object/to-have-properties">to have properties</a> </li> <li class=""> <a href="../../object/to-have-property">to have property</a> </li> <li class=""> <a href="../../object/to-have-values-satisfying">to have values satisfying</a> </li> </ul> </li> <li> <h3>function</h3> <ul> <li class=""> <a href="../../function/to-call-the-callback">to call the callback</a> </li> <li class=""> <a href="../../function/to-call-the-callback-with-error">to call the callback with error</a> </li> <li class=""> <a href="../../function/to-call-the-callback-without-error">to call the callback without error</a> </li> <li class=""> <a href="../../function/to-error">to error</a> </li> <li class=""> <a href="../../function/to-have-arity">to have arity</a> </li> <li class=""> <a href="../../function/to-throw">to throw</a> </li> </ul> </li> <li> <h3>Promise</h3> <ul> <li class=""> <a href="../../Promise/to-be-fulfilled">to be fulfilled</a> </li> <li class=""> <a href="../../Promise/to-be-rejected">to be rejected</a> </li> <li class=""> <a href="../../Promise/when-fulfilled">when fulfilled</a> </li> <li class=""> <a href="../../Promise/when-rejected">when rejected</a> </li> </ul> </li> <li> <h3>Error</h3> <ul> <li class=""> <a href="../../Error/to-have-message">to have message</a> </li> </ul> </li> <li> <h3>array-like</h3> <ul> <li class="active"> <a href="">to be empty</a> </li> <li class=""> <a href="../to-be-non-empty">to be non-empty</a> </li> <li class=""> <a href="../to-contain">to contain</a> </li> <li class=""> <a href="../to-have-items-satisfying">to have items satisfying</a> </li> <li class=""> <a href="../to-have-length">to have length</a> </li> <li class=""> <a href="../when-passed-as-parameters-to">when passed as parameters to</a> </li> </ul> </li> <li> <h3>Buffer</h3> <ul> <li class=""> <a href="../../Buffer/when-decoded-as">when decoded as</a> </li> </ul> </li> </ul> </nav> <div class="main" tabindex="-1"> <div class="content"> <h1>to be empty</h1> <p>Asserts that an array (or array-like object) is empty.</p> <p>Aliases: <code>to be the empty array</code>, <code>to be an empty array</code></p> <div class="code lang-javascript"> <div><span style="color: #000000">expect</span><span style="color: #000000">([],</span>&nbsp;<span style="color: #df5000">'to&nbsp;be&nbsp;empty'</span><span style="color: #000000">);</span></div> </div><p>In case of a failing expectation you get the following output:</p> <div class="code lang-javascript"> <div><span style="color: #000000">expect</span><span style="color: #000000">([</span><span style="color: #0086b3">1</span><span style="color: #000000">,</span><span style="color: #0086b3">2</span><span style="color: #000000">,</span><span style="color: #0086b3">3</span><span style="color: #000000">],</span>&nbsp;<span style="color: #df5000">'to&nbsp;be&nbsp;empty'</span><span style="color: #000000">);</span></div> </div><div class="output"> <div><span style="color: red; font-weight: bold">expected</span>&nbsp;[&nbsp;<span style="color: #0086b3">1</span>,&nbsp;<span style="color: #0086b3">2</span>,&nbsp;<span style="color: #0086b3">3</span>&nbsp;]&nbsp;<span style="color: red; font-weight: bold">to&nbsp;be&nbsp;empty</span></div> </div><p>This assertion can be negated using the <code>not</code> flag:</p> <div class="code lang-javascript"> <div><span style="color: #000000">expect</span><span style="color: #000000">([</span><span style="color: #0086b3">1</span><span style="color: #000000">,</span><span style="color: #0086b3">2</span><span style="color: #000000">,</span><span style="color: #0086b3">3</span><span style="color: #000000">],</span>&nbsp;<span style="color: #df5000">'not&nbsp;to&nbsp;be&nbsp;empty'</span><span style="color: #000000">);</span></div> </div><p>In case of a failing expectation you get the following output:</p> <div class="code lang-javascript"> <div><span style="color: #000000">expect</span><span style="color: #000000">([],</span>&nbsp;<span style="color: #df5000">'not&nbsp;to&nbsp;be&nbsp;empty'</span><span style="color: #000000">);</span></div> </div><div class="output"> <div><span style="color: red; font-weight: bold">expected</span>&nbsp;[]&nbsp;<span style="color: red; font-weight: bold">not&nbsp;to&nbsp;be&nbsp;empty</span></div> </div> </div> </div> </section> <script type="text/javascript"> baseUrl = '../../..'; </script> <script type="text/javascript" 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