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<section class="section">
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<h2 id='i-want-to-generate-test-mocks-for-protocols' class='heading'>I want to generate test mocks for protocols</h2>
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<p><em>Contributed by <a href="http://twitter.com/marinbenc">@marinbenc</a></em></p>
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<h4 id='for-each-protocol-implementing-code-automockable-code-protocol-or-a-href-writing-20templates-md-using-source-annotations-annotated-a-with-code-automockable-code-annotation-it-will' class='heading'>For each protocol implementing <code>AutoMockable</code> protocol or <a href="Writing%20templates.md#using-source-annotations">annotated</a> with <code>AutoMockable</code> annotation it will…</h4>
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<p>Create a class called <code>ProtocolNameMock</code> in which it will…</p>
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<p><strong>For each function:</strong></p>
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<ul>
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<li>Implement the function</li>
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<li>Add a <code>functionCalled</code> boolean to check if the function was called</li>
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<li>Add a <code>functionReceivedArguments</code> tuple to check the arguments that were passed to the function</li>
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<li>Add a <code>functionReturnValue</code> variable and return it when the function is called.</li>
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</ul>
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<p><strong>For each variable:</strong></p>
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<ul>
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<li>Add a gettable and settable variable with the same name and type</li>
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</ul>
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<h4 id='issues-and-limitations' class='heading'>Issues and limitations:</h4>
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<ul>
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<li>Overloaded methods will produce compiler errors since the variables above the functions have the same name. Workaround: delete the variables on top of one of the functions, or rename them.</li>
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<li>Handling success/failure cases (for callbacks) is tricky to do automatically, so you have to do that yourself.</li>
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<li>This is <strong>not</strong> a full replacement for hand-written mocks, but it will get you 90% of the way there. Any more complex logic than changing return types, you will have to implement yourself. This only removes the most boring boilerplate you have to write.</li>
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</ul>
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<h3 id='a-href-https-github-com-krzysztofzablocki-sourcery-blob-master-templates-templates-automockable-stencil-stencil-template-a' class='heading'><a href="https://github.com/krzysztofzablocki/Sourcery/blob/master/Templates/Templates/AutoMockable.stencil">Stencil template</a></h3>
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<h4 id='example-output' class='heading'>Example output:</h4>
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<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">MockableServiceMock</span><span class="p">:</span> <span class="kt">MockableService</span> <span class="p">{</span>
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<span class="c1">//MARK: - functionWithArguments</span>
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<span class="k">var</span> <span class="nv">functionWithArgumentsCalled</span> <span class="o">=</span> <span class="kc">false</span>
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<span class="k">var</span> <span class="nv">functionWithArgumentsReceivedArguments</span><span class="p">:</span> <span class="p">(</span><span class="nv">firstArgument</span><span class="p">:</span> <span class="kt">String</span><span class="p">,</span> <span class="nv">onComplete</span><span class="p">:</span> <span class="p">(</span><span class="kt">String</span><span class="p">)</span><span class="o">-></span> <span class="kt">Void</span><span class="p">)?</span>
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<span class="c1">//MARK: - functionWithCallback</span>
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<span class="k">var</span> <span class="nv">functionWithCallbackCalled</span> <span class="o">=</span> <span class="kc">false</span>
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<span class="k">var</span> <span class="nv">functionWithCallbackReceivedArguments</span><span class="p">:</span> <span class="p">(</span><span class="nv">firstArgument</span><span class="p">:</span> <span class="kt">String</span><span class="p">,</span> <span class="nv">onComplete</span><span class="p">:</span> <span class="p">(</span><span class="kt">String</span><span class="p">)</span><span class="o">-></span> <span class="kt">Void</span><span class="p">)?</span>
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<span class="kd">func</span> <span class="nf">functionWithCallback</span><span class="p">(</span><span class="n">_</span> <span class="nv">firstArgument</span><span class="p">:</span> <span class="kt">String</span><span class="p">,</span> <span class="nv">onComplete</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">String</span><span class="p">)</span><span class="o">-></span> <span class="kt">Void</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">functionWithCallbackCalled</span> <span class="o">=</span> <span class="kc">true</span>
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<span class="n">functionWithCallbackReceivedArguments</span> <span class="o">=</span> <span class="p">(</span><span class="nv">firstArgument</span><span class="p">:</span> <span class="n">firstArgument</span><span class="p">,</span> <span class="nv">onComplete</span><span class="p">:</span> <span class="n">onComplete</span><span class="p">)</span>
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<span class="p">}</span>
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<span class="o">...</span>
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</code></pre>
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