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<li class="toctree-l1"><a class="reference internal" href="azure-vm.html">Working with the Corda Demo on Azure Marketplace</a></li>
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<div class="section" id="integration-test-tutorial">
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<h1>Integration Test Tutorial<a class="headerlink" href="#integration-test-tutorial" title="Permalink to this headline">¶</a></h1>
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<p>Integration testing involves bringing up nodes locally and testing
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invariants about them by starting flows and inspecting their state.</p>
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<p>In this tutorial we will bring up three nodes Alice, Bob and a
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Notary. Alice will issue Cash to Bob, then Bob will send this Cash
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back to Alice. We will see how to test some simple deterministic and
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nondeterministic invariants in the meantime.</p>
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<p>(Note that this example where Alice is self-issuing Cash is purely for
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demonstration purposes, in reality Cash would be issued by a bank and
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subsequently passed around.)</p>
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<p>In order to spawn nodes we will use the Driver DSL. This DSL allows
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one to start up node processes from code. It manages a network map
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service and safe shutting down of nodes in the background.</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span> <span class="n">driver</span> <span class="p">{</span>
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<span class="k">val</span> <span class="py">testUser</span> <span class="p">=</span> <span class="n">User</span><span class="p">(</span><span class="s">"testUser"</span><span class="p">,</span> <span class="s">"testPassword"</span><span class="p">,</span> <span class="n">permissions</span> <span class="p">=</span> <span class="n">setOf</span><span class="p">(</span><span class="n">startFlowPermission</span><span class="p"><</span><span class="n">CashFlow</span><span class="p">>()))</span>
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<span class="k">val</span> <span class="py">aliceFuture</span> <span class="p">=</span> <span class="n">startNode</span><span class="p">(</span><span class="s">"Alice"</span><span class="p">,</span> <span class="n">rpcUsers</span> <span class="p">=</span> <span class="n">listOf</span><span class="p">(</span><span class="n">testUser</span><span class="p">))</span>
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<span class="k">val</span> <span class="py">bobFuture</span> <span class="p">=</span> <span class="n">startNode</span><span class="p">(</span><span class="s">"Bob"</span><span class="p">,</span> <span class="n">rpcUsers</span> <span class="p">=</span> <span class="n">listOf</span><span class="p">(</span><span class="n">testUser</span><span class="p">))</span>
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<span class="k">val</span> <span class="py">notaryFuture</span> <span class="p">=</span> <span class="n">startNode</span><span class="p">(</span><span class="s">"Notary"</span><span class="p">,</span> <span class="n">advertisedServices</span> <span class="p">=</span> <span class="n">setOf</span><span class="p">(</span><span class="n">ServiceInfo</span><span class="p">(</span><span class="n">ValidatingNotaryService</span><span class="p">.</span><span class="n">type</span><span class="p">)))</span>
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<span class="k">val</span> <span class="py">alice</span> <span class="p">=</span> <span class="n">aliceFuture</span><span class="p">.</span><span class="k">get</span><span class="p">()</span>
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<span class="k">val</span> <span class="py">bob</span> <span class="p">=</span> <span class="n">bobFuture</span><span class="p">.</span><span class="k">get</span><span class="p">()</span>
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<span class="k">val</span> <span class="py">notary</span> <span class="p">=</span> <span class="n">notaryFuture</span><span class="p">.</span><span class="k">get</span><span class="p">()</span>
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</pre></div>
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</div>
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<p>The above code creates a <code class="docutils literal"><span class="pre">User</span></code> permissioned to start the
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<code class="docutils literal"><span class="pre">CashFlow</span></code> protocol. It then starts up Alice and Bob with this user,
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allowing us to later connect to the nodes.</p>
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<p>Then the notary is started up. Note that we need to add
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<code class="docutils literal"><span class="pre">ValidatingNotaryService</span></code> as an advertised service in order for this
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node to serve notary functionality. This is also where flows added in
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plugins should be specified. Note also that we won’t connect to the
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notary directly, so there’s no need to pass in the test <code class="docutils literal"><span class="pre">User</span></code>.</p>
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<p>The <code class="docutils literal"><span class="pre">startNode</span></code> function returns a future that completes once the
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node is fully started. This allows starting of the nodes to be
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parallel. We wait on these futures as we need the information
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returned; their respective <code class="docutils literal"><span class="pre">NodeInfo</span></code> s.</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span> <span class="k">val</span> <span class="py">aliceClient</span> <span class="p">=</span> <span class="n">CordaRPCClient</span><span class="p">(</span>
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<span class="n">host</span> <span class="p">=</span> <span class="n">ArtemisMessagingComponent</span><span class="p">.</span><span class="n">toHostAndPort</span><span class="p">(</span><span class="n">alice</span><span class="p">.</span><span class="n">nodeInfo</span><span class="p">.</span><span class="n">address</span><span class="p">),</span>
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<span class="n">config</span> <span class="p">=</span> <span class="n">configureTestSSL</span><span class="p">()</span>
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<span class="p">)</span>
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<span class="n">aliceClient</span><span class="p">.</span><span class="n">start</span><span class="p">(</span><span class="s">"testUser"</span><span class="p">,</span> <span class="s">"testPassword"</span><span class="p">)</span>
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<span class="k">val</span> <span class="py">aliceProxy</span> <span class="p">=</span> <span class="n">aliceClient</span><span class="p">.</span><span class="n">proxy</span><span class="p">()</span>
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<span class="k">val</span> <span class="py">bobClient</span> <span class="p">=</span> <span class="n">CordaRPCClient</span><span class="p">(</span>
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<span class="n">host</span> <span class="p">=</span> <span class="n">ArtemisMessagingComponent</span><span class="p">.</span><span class="n">toHostAndPort</span><span class="p">(</span><span class="n">bob</span><span class="p">.</span><span class="n">nodeInfo</span><span class="p">.</span><span class="n">address</span><span class="p">),</span>
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<span class="n">config</span> <span class="p">=</span> <span class="n">configureTestSSL</span><span class="p">()</span>
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<span class="p">)</span>
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<span class="n">bobClient</span><span class="p">.</span><span class="n">start</span><span class="p">(</span><span class="s">"testUser"</span><span class="p">,</span> <span class="s">"testPassword"</span><span class="p">)</span>
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<span class="k">val</span> <span class="py">bobProxy</span> <span class="p">=</span> <span class="n">bobClient</span><span class="p">.</span><span class="n">proxy</span><span class="p">()</span>
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</pre></div>
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</div>
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<p>Next we connect to Alice and Bob respectively from the test process
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using the test user we created. Then we establish RPC links that allow
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us to start flows and query state.</p>
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<p>Note that Driver nodes start up with test server certificiates, so
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it’s enough to pass in <code class="docutils literal"><span class="pre">configureTestSSL()</span></code> for the clients.</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span> <span class="k">val</span> <span class="py">bobVaultUpdates</span> <span class="p">=</span> <span class="n">bobProxy</span><span class="p">.</span><span class="n">vaultAndUpdates</span><span class="p">().</span><span class="n">second</span>
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<span class="k">val</span> <span class="py">aliceVaultUpdates</span> <span class="p">=</span> <span class="n">aliceProxy</span><span class="p">.</span><span class="n">vaultAndUpdates</span><span class="p">().</span><span class="n">second</span>
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</pre></div>
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</div>
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<p>We will be interested in changes to Alice’s and Bob’s vault, so we
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query a stream of vault updates from each.</p>
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<p>Now that we’re all set up we can finally get some Cash action going!</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span> <span class="k">val</span> <span class="py">issueRef</span> <span class="p">=</span> <span class="n">OpaqueBytes</span><span class="p">.</span><span class="n">of</span><span class="p">(</span><span class="m">0</span><span class="p">)</span>
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<span class="k">for</span> <span class="p">(</span><span class="n">i</span> <span class="k">in</span> <span class="m">1</span> <span class="p">..</span> <span class="m">10</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">thread</span> <span class="p">{</span>
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<span class="n">aliceProxy</span><span class="p">.</span><span class="n">startFlow</span><span class="p">(</span><span class="o">::</span><span class="n">CashFlow</span><span class="p">,</span> <span class="n">CashCommand</span><span class="p">.</span><span class="n">IssueCash</span><span class="p">(</span>
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<span class="n">amount</span> <span class="p">=</span> <span class="n">i</span><span class="p">.</span><span class="n">DOLLARS</span><span class="p">,</span>
|
|
<span class="n">issueRef</span> <span class="p">=</span> <span class="n">issueRef</span><span class="p">,</span>
|
|
<span class="n">recipient</span> <span class="p">=</span> <span class="n">bob</span><span class="p">.</span><span class="n">nodeInfo</span><span class="p">.</span><span class="n">legalIdentity</span><span class="p">,</span>
|
|
<span class="n">notary</span> <span class="p">=</span> <span class="n">notary</span><span class="p">.</span><span class="n">nodeInfo</span><span class="p">.</span><span class="n">notaryIdentity</span>
|
|
<span class="p">))</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="n">bobVaultUpdates</span><span class="p">.</span><span class="n">expectEvents</span> <span class="p">{</span>
|
|
<span class="n">parallel</span><span class="p">(</span>
|
|
<span class="p">(</span><span class="m">1</span> <span class="p">..</span> <span class="m">10</span><span class="p">).</span><span class="n">map</span> <span class="p">{</span> <span class="n">i</span> <span class="p">-></span>
|
|
<span class="n">expect</span><span class="p">(</span>
|
|
<span class="n">match</span> <span class="p">=</span> <span class="p">{</span> <span class="n">update</span><span class="p">:</span> <span class="n">Vault</span><span class="p">.</span><span class="n">Update</span> <span class="p">-></span>
|
|
<span class="p">(</span><span class="n">update</span><span class="p">.</span><span class="n">produced</span><span class="p">.</span><span class="n">first</span><span class="p">().</span><span class="n">state</span><span class="p">.</span><span class="k">data</span> <span class="k">as</span> <span class="n">Cash</span><span class="p">.</span><span class="n">State</span><span class="p">).</span><span class="n">amount</span><span class="p">.</span><span class="n">quantity</span> <span class="p">==</span> <span class="n">i</span> <span class="p">*</span> <span class="m">100L</span>
|
|
<span class="p">}</span>
|
|
<span class="p">)</span> <span class="p">{</span> <span class="n">update</span> <span class="p">-></span>
|
|
<span class="n">println</span><span class="p">(</span><span class="s">"Bob vault update of $update"</span><span class="p">)</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
<span class="p">)</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>The first loop creates 10 threads, each starting a <code class="docutils literal"><span class="pre">CashFlow</span></code> flow
|
|
on the Alice node. We specify that we want to issue <code class="docutils literal"><span class="pre">i</span></code> dollars to
|
|
Bob, using the Notary as the notary responsible for notarising the
|
|
created states. Note that no notarisation will occur yet as we’re not
|
|
spending any states, only entering new ones to the ledger.</p>
|
|
<p>We started the flows from different threads for the sake of the
|
|
tutorial, to demonstrate how to test non-determinism, which is what
|
|
the <code class="docutils literal"><span class="pre">expectEvents</span></code> block does.</p>
|
|
<p>The Expect DSL allows ordering constraints to be checked on a stream
|
|
of events. The above code specifies that we are expecting 10 updates
|
|
to be emitted on the <code class="docutils literal"><span class="pre">bobVaultUpdates</span></code> stream in unspecified order
|
|
(this is what the <code class="docutils literal"><span class="pre">parallel</span></code> construct does). We specify a
|
|
(otherwise optional) <code class="docutils literal"><span class="pre">match</span></code> predicate to identify specific updates
|
|
we are interested in, which we then print.</p>
|
|
<p>If we run the code written so far we should see 4 nodes starting up
|
|
(Alice,Bob,Notary + implicit Network Map service), then 10 logs of Bob
|
|
receiving 1,2,...10 dollars from Alice in some unspecified order.</p>
|
|
<p>Next we want Bob to send this Cash back to Alice.</p>
|
|
<div class="highlight-kotlin"><div class="highlight"><pre><span></span> <span class="k">for</span> <span class="p">(</span><span class="n">i</span> <span class="k">in</span> <span class="m">1</span> <span class="p">..</span> <span class="m">10</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="k">val</span> <span class="py">flowHandle</span> <span class="p">=</span> <span class="n">bobProxy</span><span class="p">.</span><span class="n">startFlow</span><span class="p">(</span><span class="o">::</span><span class="n">CashFlow</span><span class="p">,</span> <span class="n">CashCommand</span><span class="p">.</span><span class="n">PayCash</span><span class="p">(</span>
|
|
<span class="n">amount</span> <span class="p">=</span> <span class="n">i</span><span class="p">.</span><span class="n">DOLLARS</span><span class="p">.</span><span class="n">issuedBy</span><span class="p">(</span><span class="n">alice</span><span class="p">.</span><span class="n">nodeInfo</span><span class="p">.</span><span class="n">legalIdentity</span><span class="p">.</span><span class="n">ref</span><span class="p">(</span><span class="n">issueRef</span><span class="p">)),</span>
|
|
<span class="n">recipient</span> <span class="p">=</span> <span class="n">alice</span><span class="p">.</span><span class="n">nodeInfo</span><span class="p">.</span><span class="n">legalIdentity</span>
|
|
<span class="p">))</span>
|
|
<span class="n">assert</span><span class="p">(</span><span class="n">flowHandle</span><span class="p">.</span><span class="n">returnValue</span><span class="p">.</span><span class="n">toBlocking</span><span class="p">().</span><span class="n">first</span><span class="p">()</span> <span class="k">is</span> <span class="n">CashFlowResult</span><span class="p">.</span><span class="n">Success</span><span class="p">)</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="n">aliceVaultUpdates</span><span class="p">.</span><span class="n">expectEvents</span> <span class="p">{</span>
|
|
<span class="n">sequence</span><span class="p">(</span>
|
|
<span class="p">(</span><span class="m">1</span> <span class="p">..</span> <span class="m">10</span><span class="p">).</span><span class="n">map</span> <span class="p">{</span> <span class="n">i</span> <span class="p">-></span>
|
|
<span class="n">expect</span> <span class="p">{</span> <span class="n">update</span><span class="p">:</span> <span class="n">Vault</span><span class="p">.</span><span class="n">Update</span> <span class="p">-></span>
|
|
<span class="n">println</span><span class="p">(</span><span class="s">"Alice got vault update of $update"</span><span class="p">)</span>
|
|
<span class="n">assertEquals</span><span class="p">((</span><span class="n">update</span><span class="p">.</span><span class="n">produced</span><span class="p">.</span><span class="n">first</span><span class="p">().</span><span class="n">state</span><span class="p">.</span><span class="k">data</span> <span class="k">as</span> <span class="n">Cash</span><span class="p">.</span><span class="n">State</span><span class="p">).</span><span class="n">amount</span><span class="p">.</span><span class="n">quantity</span><span class="p">,</span> <span class="n">i</span> <span class="p">*</span> <span class="m">100L</span><span class="p">)</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
<span class="p">)</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</pre></div>
|
|
</div>
|
|
<p>This time we’ll do it sequentially. We make Bob pay 1,2,..10 dollars
|
|
to Alice in order. We make sure that a the <code class="docutils literal"><span class="pre">CashFlow</span></code> has finished
|
|
by waiting on <code class="docutils literal"><span class="pre">startFlow</span></code> ‘s <code class="docutils literal"><span class="pre">returnValue</span></code>.</p>
|
|
<p>Then we use the Expect DSL again, this time using <code class="docutils literal"><span class="pre">sequence</span></code> to test
|
|
for the updates arriving in the order we expect them to.</p>
|
|
<p>Note that <code class="docutils literal"><span class="pre">parallel</span></code> and <code class="docutils literal"><span class="pre">sequence</span></code> may be nested into each other
|
|
arbitrarily to test more complex scenarios.</p>
|
|
<p>That’s it! We saw how to start up several corda nodes locally, how to
|
|
connect to them, and how to test some simple invariants about
|
|
<code class="docutils literal"><span class="pre">CashFlow</span></code>.</p>
|
|
<p>To run the complete test you can open
|
|
<code class="docutils literal"><span class="pre">example-code/src/integration-test/kotlin/net/corda/docs/IntegrationTestingTutorial.kt</span></code>
|
|
from IntelliJ and run the test, or alternatively use gradle:</p>
|
|
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="c1"># Run example-code integration tests</span>
|
|
./gradlew docs/source/example-code:integrationTest -i
|
|
</pre></div>
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