unexpected
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Extensible BDD assertion toolkit
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<h1 id="expect-clone-">expect.clone()</h1>
<p>Before extending the unexpected instance with new functionality it is
usually a good idea to clone it, so you don't change the global
instance. You do that by calling the <code>clone</code> method.</p>
<p>Adding new functionality to the cloned instance will not affect the
original instance:</p>
<div class="code lang-javascript">
<div><span style="color: #a71d5d">var</span> originalExpect <span style="color: #a71d5d">=</span> expect<span style="color: #000000">;</span></div>
<div> </div>
<div>expect <span style="color: #a71d5d">=</span> expect<span style="color: #000000">.</span><span style="color: #000000">clone</span><span style="color: #000000">().</span><span style="color: #000000">addAssertion</span><span style="color: #000000">(</span><span style="color: #df5000">'to be an integer'</span><span style="color: #000000">,</span> <span style="color: #a71d5d">function</span> <span style="color: #000000">(</span>expect<span style="color: #000000">,</span> subject<span style="color: #000000">)</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>subject<span style="color: #000000">,</span> <span style="color: #df5000">'to be a number'</span><span style="color: #000000">);</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>Math<span style="color: #000000">.</span><span style="color: #000000">round</span><span style="color: #000000">(</span>subject<span style="color: #000000">),</span> <span style="color: #df5000">'to be'</span><span style="color: #000000">,</span> subject<span style="color: #000000">);</span></div>
<div><span style="color: #000000">});</span></div>
<div> </div>
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #0086b3">42</span><span style="color: #000000">,</span> <span style="color: #df5000">'to be an integer'</span><span style="color: #000000">);</span></div>
</div><p>If we try to use the new assertion on the original instance it fails:</p>
<div class="code lang-javascript">
<div><span style="color: #000000">originalExpect</span><span style="color: #000000">(</span><span style="color: #0086b3">42</span><span style="color: #000000">,</span> <span style="color: #df5000">'to be an integer'</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">Unknown assertion '</span><span style="color: #df5000">to be an integer</span><span style="color: red; font-weight: bold">', did you mean: '</span><span style="color: #df5000">to be a number</span><span style="color: red; font-weight: bold">'</span></div>
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