unexpected
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Extensible BDD assertion toolkit
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<p>Asserts that the function throws an error when called.</p>
<div class="code lang-javascript">
<div><span style="color: #a71d5d">function</span> <span style="color: #000000">willThrow</span><span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'The error message'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">}</span></div>
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span>willThrow<span style="color: #000000">,</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span>willThrow<span style="color: #000000">,</span> <span style="color: #df5000">'to throw error'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span>willThrow<span style="color: #000000">,</span> <span style="color: #df5000">'to throw exception'</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: #a71d5d">function</span> <span style="color: #000000">willNotThrow</span><span style="color: #000000">()</span> <span style="color: #000000">{},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span> <span style="color: #a71d5d">function</span> <span style="color: #000000">willNotThrow</span><span style="color: #000000">()</span> <span style="color: #000000">{}</span> <span style="color: red; font-weight: bold">to throw</span></div>
</div><p>You can assert the error message is a given string if you provide a
string as the second parameter.</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'The error message'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #df5000">'The error message'</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: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'The error message!'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #df5000">'The error message'</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span></div>
<div><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'The error message!'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">}</span></div>
<div><span style="color: red; font-weight: bold">to throw</span> <span style="color: #df5000">'The error message'</span></div>
<div> <div style="display: inline-block; vertical-align: top">
<div><span style="color: red; font-weight: bold">expected</span> Error(<span style="color: #df5000">'The error message!'</span>) <span style="color: red; font-weight: bold">to satisfy</span> <span style="color: #df5000">'The error message'</span></div>
<div> </div>
<div><div style="display: inline-block; vertical-align: top">
<div><span style="color: red">-</span></div>
</div><div style="display: inline-block; vertical-align: top">
<div><span style="color: red">The error message</span><span style="background-color: red; color: white">!</span></div>
</div></div>
<div><div style="display: inline-block; vertical-align: top">
<div><span style="color: green">+</span></div>
</div><div style="display: inline-block; vertical-align: top">
<div><span style="color: green">The error message</span></div>
</div></div>
</div></div>
</div><p>By providing a regular expression as the second parameter you can
assert the error message matches the given regular expression.</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'The error message'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #183691">/error message/</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: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'The error message!'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #183691">/catastrophic failure/</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span></div>
<div><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'The error message!'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">}</span></div>
<div><span style="color: red; font-weight: bold">to throw</span> <span style="color: #183691">/catastrophic failure/</span></div>
<div> <div style="display: inline-block; vertical-align: top">
<div><span style="color: red; font-weight: bold">expected</span> Error(<span style="color: #df5000">'The error message!'</span>) <span style="color: red; font-weight: bold">to satisfy</span> <span style="color: #183691">/catastrophic failure/</span></div>
</div></div>
</div><p>You can also provide a function as the second parameter to do
arbitrary assertions on the error.</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">this</span><span style="color: #000000">.</span>foo<span style="color: #000000">.</span><span style="color: #000000">bar</span><span style="color: #000000">();</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #a71d5d">function</span> <span style="color: #000000">(</span>e<span style="color: #000000">)</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>e<span style="color: #000000">,</span> <span style="color: #df5000">'to be a'</span><span style="color: #000000">,</span> TypeError<span style="color: #000000">);</span></div>
<div><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: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'Another error'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #a71d5d">function</span> <span style="color: #000000">(</span>e<span style="color: #000000">)</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>e<span style="color: #000000">,</span> <span style="color: #df5000">'to be a'</span><span style="color: #000000">,</span> TypeError<span style="color: #000000">);</span></div>
<div><span style="color: #000000">});</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span></div>
<div><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'Another error'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">}</span></div>
<div><span style="color: red; font-weight: bold">to throw</span></div>
<div><span style="color: #a71d5d">function</span> <span style="color: #000000">(</span>e<span style="color: #000000">)</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>e<span style="color: #000000">,</span> <span style="color: #df5000">'to be a'</span><span style="color: #000000">,</span> TypeError<span style="color: #000000">);</span></div>
<div><span style="color: #000000">}</span></div>
<div> <div style="display: inline-block; vertical-align: top">
<div><span style="color: red; font-weight: bold">expected</span> Error(<span style="color: #df5000">'Another error'</span>) <span style="color: red; font-weight: bold">to be a</span> TypeError</div>
</div></div>
</div><p>Actually what happens is, that the thrown error is checked
<a href="/assertions/any/to-satisfy/">to satisfy</a> against the second
parameter. That means you could also just supply an error object to
validate against:</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> TypeError<span style="color: #000000">(</span><span style="color: #df5000">'Invalid syntax'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #a71d5d">new</span> TypeError<span style="color: #000000">(</span><span style="color: #df5000">'Invalid syntax'</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: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'Another error'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'to throw'</span><span style="color: #000000">,</span> <span style="color: #a71d5d">new</span> TypeError<span style="color: #000000">(</span><span style="color: #df5000">'Invalid syntax'</span><span style="color: #000000">));</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span></div>
<div><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'Another error'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">}</span></div>
<div><span style="color: red; font-weight: bold">to throw</span> TypeError(<span style="color: #df5000">'Invalid syntax'</span>)</div>
<div> <div style="display: inline-block; vertical-align: top">
<div><span style="color: red; font-weight: bold">expected</span> Error(<span style="color: #df5000">'Another error'</span>) <span style="color: red; font-weight: bold">to satisfy</span> TypeError(<span style="color: #df5000">'Invalid syntax'</span>)</div>
</div></div>
</div><div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">(</span><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #969896"> // Do some work that should not throw</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'not to throw'</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: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'threw anyway'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">},</span> <span style="color: #df5000">'not to throw'</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">expected</span></div>
<div><span style="color: #a71d5d">function</span> <span style="color: #000000">()</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #a71d5d">throw</span> <span style="color: #a71d5d">new</span> Error<span style="color: #000000">(</span><span style="color: #df5000">'threw anyway'</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">}</span></div>
<div><span style="color: red; font-weight: bold">not to throw</span></div>
<div> <div style="display: inline-block; vertical-align: top">
<div><span style="color: red; font-weight: bold">threw: </span>Error(<span style="color: #df5000">'threw anyway'</span>)</div>
</div></div>
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