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<p>Asserts that all keys of a map satisfies a given function.</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">({</span> foo<span style="color: #000000">:</span> <span style="color: #0086b3">0</span><span style="color: #000000">,</span> bar<span style="color: #000000">:</span> <span style="color: #0086b3">1</span><span style="color: #000000">,</span> baz<span style="color: #000000">:</span> <span style="color: #0086b3">2</span><span style="color: #000000">,</span> qux<span style="color: #000000">:</span> <span style="color: #0086b3">3</span> <span style="color: #000000">},</span></div>
<div> <span style="color: #df5000">'to be a map whose keys satisfy'</span><span style="color: #000000">,</span> <span style="color: #0086b3">function</span> <span style="color: #000000">(</span>key<span style="color: #000000">,</span> value<span style="color: #000000">)</span> <span style="color: #000000">{</span></div>
<div> <span style="color: #000000">expect</span><span style="color: #000000">(</span>key<span style="color: #000000">,</span> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #df5000">/^[a-z]{3}$/</span><span style="color: #000000">);</span></div>
<div><span style="color: #000000">});</span></div>
<div> </div>
<div><span style="color: #000000">expect</span><span style="color: #000000">({</span> foo<span style="color: #000000">:</span> <span style="color: #0086b3">0</span><span style="color: #000000">,</span> bar<span style="color: #000000">:</span> <span style="color: #0086b3">1</span><span style="color: #000000">,</span> baz<span style="color: #000000">:</span> <span style="color: #0086b3">2</span><span style="color: #000000">,</span> qux<span style="color: #000000">:</span> <span style="color: #0086b3">3</span> <span style="color: #000000">},</span></div>
<div> <span style="color: #df5000">'to be a map whose keys satisfy'</span><span style="color: #000000">,</span></div>
<div> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #df5000">/^[a-z]{3}$/</span><span style="color: #000000">);</span></div>
<div> </div>
<div><span style="color: #000000">expect</span><span style="color: #000000">([</span><span style="color: #df5000">'foo'</span><span style="color: #000000">,</span> <span style="color: #df5000">'bar'</span><span style="color: #000000">,</span> <span style="color: #df5000">'baz'</span><span style="color: #000000">,</span> <span style="color: #df5000">'qux'</span><span style="color: #000000">],</span></div>
<div> <span style="color: #df5000">'to be a non-empty map whose keys satisfy'</span><span style="color: #000000">,</span></div>
<div> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #df5000">/^\d+$/</span><span style="color: #000000">);</span></div>
</div><p>In case of a failing expectation you get the following output:</p>
<div class="code lang-javascript">
<div><span style="color: #000000">expect</span><span style="color: #000000">({</span> foo<span style="color: #000000">:</span> <span style="color: #0086b3">0</span><span style="color: #000000">,</span> bar<span style="color: #000000">:</span> <span style="color: #0086b3">1</span><span style="color: #000000">,</span> baz<span style="color: #000000">:</span> <span style="color: #0086b3">2</span><span style="color: #000000">,</span> qux<span style="color: #000000">:</span> <span style="color: #0086b3">3</span><span style="color: #000000">,</span> quux<span style="color: #000000">:</span> <span style="color: #0086b3">4</span> <span style="color: #000000">},</span></div>
<div> <span style="color: #df5000">'to be a map whose keys satisfy'</span><span style="color: #000000">,</span></div>
<div> <span style="color: #df5000">'to match'</span><span style="color: #000000">,</span> <span style="color: #df5000">/^[a-z]{3}$/</span><span style="color: #000000">);</span></div>
</div><div class="output">
<div><span style="color: red; font-weight: bold">failed expectation on keys </span>foo, bar, baz, qux, quux<span style="color: red; font-weight: bold">:</span></div>
<div> quux: <div style="display: inline-block; vertical-align: top">
<div><span style="color: red; font-weight: bold">expected</span> <span style="color: #df5000">'quux'</span> <span style="color: red; font-weight: bold">to match</span> <span style="color: #df5000">/^[a-z]{3}$/</span></div>
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