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<div class="section" id="testing">
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<h1>Testing<a class="headerlink" href="#testing" title="Permalink to this headline">¶</a></h1>
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<p>Some quick examples for techniques for testing.</p>
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<hr class="docutils" />
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<div class="section" id="contract-events">
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<h2>Contract Events<a class="headerlink" href="#contract-events" title="Permalink to this headline">¶</a></h2>
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<div class="literal-block-wrapper docutils container" id="id1">
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<div class="code-block-caption"><span class="caption-text"><em>Testing ERC-20 Transfer Event</em></span><a class="headerlink" href="#id1" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="nx">describe</span><span class="p">(</span><span class="s1">'Events'</span><span class="p">,</span> <span class="nx">async</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="nx">it</span><span class="p">(</span><span class="s1">'triggers a Transfer event'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="kd">let</span> <span class="nx">contract</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Contract</span><span class="p">(</span><span class="nx">contractAddress</span><span class="p">,</span> <span class="nx">abi</span><span class="p">,</span> <span class="nx">accounts</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span>
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<span class="kd">let</span> <span class="nx">transferEvent</span> <span class="o">=</span> <span class="k">new</span> <span class="nb">Promise</span><span class="p">((</span><span class="nx">resolve</span><span class="p">,</span> <span class="nx">reject</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="nx">contract</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="s1">'Transfer'</span><span class="p">,</span> <span class="p">(</span><span class="nx">from</span><span class="p">,</span> <span class="nx">to</span><span class="p">,</span> <span class="nx">amount</span><span class="p">,</span> <span class="nx">event</span><span class="p">)</span> <span class="p">=></span> <span class="p">{</span>
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<span class="nx">event</span><span class="p">.</span><span class="nx">removeListener</span><span class="p">();</span>
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<span class="nx">resolve</span><span class="p">({</span>
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<span class="nx">from</span><span class="o">:</span> <span class="nx">from</span><span class="p">,</span>
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<span class="nx">to</span><span class="o">:</span> <span class="nx">to</span><span class="p">,</span>
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<span class="nx">amount</span><span class="o">:</span> <span class="nx">amount</span>
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<span class="p">});</span>
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<span class="p">});</span>
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<span class="nx">setTimeout</span><span class="p">(()</span> <span class="p">=></span> <span class="p">{</span>
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<span class="nx">reject</span><span class="p">(</span><span class="k">new</span> <span class="nb">Error</span><span class="p">(</span><span class="s1">'timeout'</span><span class="p">));</span>
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<span class="p">},</span> <span class="mi">60000</span><span class="p">)</span>
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<span class="p">});</span>
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<span class="kd">let</span> <span class="nx">tx</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">contract</span><span class="p">.</span><span class="nx">transfer</span><span class="p">(</span><span class="nx">accounts</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="mi">12345</span><span class="p">);</span>
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<span class="kd">let</span> <span class="nx">event</span> <span class="o">=</span> <span class="nx">await</span> <span class="nx">transferEvent</span><span class="p">;</span>
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<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="nx">event</span><span class="p">.</span><span class="nx">from</span><span class="p">,</span> <span class="nx">account</span><span class="p">[</span><span class="mi">0</span><span class="p">].</span><span class="nx">address</span><span class="p">);</span>
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<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="nx">event</span><span class="p">.</span><span class="nx">to</span><span class="p">,</span> <span class="nx">account</span><span class="p">[</span><span class="mi">1</span><span class="p">].</span><span class="nx">address</span><span class="p">);</span>
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<span class="nx">assert</span><span class="p">.</span><span class="nx">equal</span><span class="p">(</span><span class="nx">event</span><span class="p">.</span><span class="nx">amount</span><span class="p">.</span><span class="nx">toNumber</span><span class="p">(),</span> <span class="mi">12345</span><span class="p">);</span>
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<span class="p">});</span>
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<span class="p">});</span>
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</pre></div>
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</div>
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</div>
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</div>
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<hr class="docutils" />
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<div class="section" id="using-multiple-accounts">
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<h2>Using Multiple Accounts<a class="headerlink" href="#using-multiple-accounts" title="Permalink to this headline">¶</a></h2>
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<div class="literal-block-wrapper docutils container" id="id2">
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<div class="code-block-caption"><span class="caption-text"><em>Testing Multiple Accounts</em></span><a class="headerlink" href="#id2" title="Permalink to this code">¶</a></div>
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<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="nx">describe</span><span class="p">(</span><span class="s1">'Events'</span><span class="p">,</span> <span class="nx">async</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="nx">it</span><span class="p">(</span><span class="s1">'triggers a Transfer event'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="c1">// Connect to Geth/Parity node on http://localhost:8545</span>
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<span class="kd">let</span> <span class="nx">provider</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">providers</span><span class="p">.</span><span class="nx">JsonRpcProvider</span><span class="p">();</span>
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<span class="c1">// Get the first two accounts from the Geth/Parity node</span>
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<span class="kd">let</span> <span class="nx">signer0</span> <span class="o">=</span> <span class="nx">provider</span><span class="p">.</span><span class="nx">getSigner</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>
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<span class="kd">let</span> <span class="nx">signer1</span> <span class="o">=</span> <span class="nx">provider</span><span class="p">.</span><span class="nx">getSigner</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span>
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<span class="c1">// Read-only connection to the contract</span>
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<span class="kd">let</span> <span class="nx">contract</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Contract</span><span class="p">(</span><span class="nx">contractAddress</span><span class="p">,</span> <span class="nx">abi</span><span class="p">,</span> <span class="nx">provider</span><span class="p">);</span>
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<span class="c1">// Read-Write connection to the contract</span>
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<span class="kd">let</span> <span class="nx">contractAsSigner0</span> <span class="o">=</span> <span class="nx">contract</span><span class="p">.</span><span class="nx">connect</span><span class="p">(</span><span class="nx">signer0</span><span class="p">);</span>
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<span class="kd">let</span> <span class="nx">contractAsSigner1</span> <span class="o">=</span> <span class="nx">contract</span><span class="p">.</span><span class="nx">connect</span><span class="p">(</span><span class="nx">signer1</span><span class="p">);</span>
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<span class="c1">// ...</span>
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<span class="p">});</span>
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<span class="p">});</span>
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</pre></div>
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