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<script type="text/javascript" src="_static/codesets.js"></script><div class="section" id="writing-flow-tests">
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<h1>Writing flow tests<a class="headerlink" href="#writing-flow-tests" title="Permalink to this headline">¶</a></h1>
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<p>A flow can be a fairly complex thing that interacts with many services and other parties over the network. That
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means unit testing one requires some infrastructure to provide lightweight mock implementations. The MockNetwork
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provides this testing infrastructure layer; you can find this class in the test-utils module.</p>
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<p>A good example to examine for learning how to unit test flows is the <code class="docutils literal"><span class="pre">ResolveTransactionsFlow</span></code> tests. This
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flow takes care of downloading and verifying transaction graphs, with all the needed dependencies. We start
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with this basic skeleton:</p>
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<div class="codeset container">
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">ResolveTransactionsFlowTest</span> <span class="p">{</span>
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<span class="k">lateinit</span> <span class="k">var</span> <span class="py">net</span><span class="p">:</span> <span class="n">MockNetwork</span>
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<span class="k">lateinit</span> <span class="k">var</span> <span class="py">a</span><span class="p">:</span> <span class="n">MockNetwork</span><span class="p">.</span><span class="n">MockNode</span>
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<span class="k">lateinit</span> <span class="k">var</span> <span class="py">b</span><span class="p">:</span> <span class="n">MockNetwork</span><span class="p">.</span><span class="n">MockNode</span>
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<span class="k">lateinit</span> <span class="k">var</span> <span class="py">notary</span><span class="p">:</span> <span class="n">Party</span>
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<span class="n">@Before</span>
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<span class="k">fun</span> <span class="nf">setup</span><span class="p">()</span> <span class="p">{</span>
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<span class="n">net</span> <span class="p">=</span> <span class="n">MockNetwork</span><span class="p">()</span>
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<span class="k">val</span> <span class="py">nodes</span> <span class="p">=</span> <span class="n">net</span><span class="p">.</span><span class="n">createSomeNodes</span><span class="p">()</span>
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<span class="n">a</span> <span class="p">=</span> <span class="n">nodes</span><span class="p">.</span><span class="n">partyNodes</span><span class="p">[</span><span class="m">0</span><span class="p">]</span>
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<span class="n">b</span> <span class="p">=</span> <span class="n">nodes</span><span class="p">.</span><span class="n">partyNodes</span><span class="p">[</span><span class="m">1</span><span class="p">]</span>
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<span class="n">notary</span> <span class="p">=</span> <span class="n">nodes</span><span class="p">.</span><span class="n">notaryNode</span><span class="p">.</span><span class="n">info</span><span class="p">.</span><span class="n">notaryIdentity</span>
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<span class="n">net</span><span class="p">.</span><span class="n">runNetwork</span><span class="p">()</span>
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<span class="p">}</span>
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<span class="n">@After</span>
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<span class="k">fun</span> <span class="nf">tearDown</span><span class="p">()</span> <span class="p">{</span>
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<span class="n">net</span><span class="p">.</span><span class="n">stopNodes</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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<p>We create a mock network in our <code class="docutils literal"><span class="pre">@Before</span></code> setup method and create a couple of nodes. We also record the identity
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of the notary in our test network, which will come in handy later. We also tidy up when we’re done.</p>
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<p>Next, we write a test case:</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span> @Test
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fun `resolve from two hashes`() {
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val (stx1, stx2) = makeTransactions()
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val p = ResolveTransactionsFlow(setOf(stx2.id), a.info.legalIdentity)
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val future = b.services.startFlow(p).resultFuture
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net.runNetwork()
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val results = future.getOrThrow()
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assertEquals(listOf(stx1.id, stx2.id), results.map { it.id })
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databaseTransaction(b.database) {
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assertEquals(stx1, b.storage.validatedTransactions.getTransaction(stx1.id))
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assertEquals(stx2, b.storage.validatedTransactions.getTransaction(stx2.id))
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}
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}
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</pre></div>
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</div>
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<p>We’ll take a look at the <code class="docutils literal"><span class="pre">makeTransactions</span></code> function in a moment. For now, it’s enough to know that it returns two
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<code class="docutils literal"><span class="pre">SignedTransaction</span></code> objects, the second of which spends the first. Both transactions are known by node A
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but not node B.</p>
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<p>The test logic is simple enough: we create the flow, giving it node A’s identity as the target to talk to.
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Then we start it on node B and use the <code class="docutils literal"><span class="pre">net.runNetwork()</span></code> method to bounce messages around until things have
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settled (i.e. there are no more messages waiting to be delivered). All this is done using an in memory message
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routing implementation that is fast to initialise and use. Finally, we obtain the result of the flow and do
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some tests on it. We also check the contents of node B’s database to see that the flow had the intended effect
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on the node’s persistent state.</p>
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<p>Here’s what <code class="docutils literal"><span class="pre">makeTransactions</span></code> looks like:</p>
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<div class="highlight-kotlin"><div class="highlight"><pre><span></span> <span class="k">private</span> <span class="k">fun</span> <span class="nf">makeTransactions</span><span class="p">(</span><span class="n">signFirstTX</span><span class="p">:</span> <span class="n">Boolean</span> <span class="p">=</span> <span class="k">true</span><span class="p">,</span> <span class="n">withAttachment</span><span class="p">:</span> <span class="n">SecureHash</span><span class="p">?</span> <span class="p">=</span> <span class="k">null</span><span class="p">):</span> <span class="n">Pair</span><span class="p"><</span><span class="n">SignedTransaction</span><span class="p">,</span> <span class="n">SignedTransaction</span><span class="p">></span> <span class="p">{</span>
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<span class="c1">// Make a chain of custody of dummy states and insert into node A.</span>
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<span class="k">val</span> <span class="py">dummy1</span><span class="p">:</span> <span class="n">SignedTransaction</span> <span class="p">=</span> <span class="n">DummyContract</span><span class="p">.</span><span class="n">generateInitial</span><span class="p">(</span><span class="n">MEGA_CORP</span><span class="p">.</span><span class="n">ref</span><span class="p">(</span><span class="m">1</span><span class="p">),</span> <span class="m">0</span><span class="p">,</span> <span class="n">notary</span><span class="p">).</span><span class="n">let</span> <span class="p">{</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">withAttachment</span> <span class="p">!=</span> <span class="k">null</span><span class="p">)</span>
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<span class="n">it</span><span class="p">.</span><span class="n">addAttachment</span><span class="p">(</span><span class="n">withAttachment</span><span class="p">)</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">signFirstTX</span><span class="p">)</span>
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<span class="n">it</span><span class="p">.</span><span class="n">signWith</span><span class="p">(</span><span class="n">MEGA_CORP_KEY</span><span class="p">)</span>
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<span class="n">it</span><span class="p">.</span><span class="n">signWith</span><span class="p">(</span><span class="n">DUMMY_NOTARY_KEY</span><span class="p">)</span>
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<span class="n">it</span><span class="p">.</span><span class="n">toSignedTransaction</span><span class="p">(</span><span class="k">false</span><span class="p">)</span>
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<span class="p">}</span>
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<span class="k">val</span> <span class="py">dummy2</span><span class="p">:</span> <span class="n">SignedTransaction</span> <span class="p">=</span> <span class="n">DummyContract</span><span class="p">.</span><span class="n">move</span><span class="p">(</span><span class="n">dummy1</span><span class="p">.</span><span class="n">tx</span><span class="p">.</span><span class="n">outRef</span><span class="p">(</span><span class="m">0</span><span class="p">),</span> <span class="n">MINI_CORP_PUBKEY</span><span class="p">).</span><span class="n">let</span> <span class="p">{</span>
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<span class="n">it</span><span class="p">.</span><span class="n">signWith</span><span class="p">(</span><span class="n">MEGA_CORP_KEY</span><span class="p">)</span>
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<span class="n">it</span><span class="p">.</span><span class="n">signWith</span><span class="p">(</span><span class="n">DUMMY_NOTARY_KEY</span><span class="p">)</span>
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<span class="n">it</span><span class="p">.</span><span class="n">toSignedTransaction</span><span class="p">()</span>
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<span class="p">}</span>
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<span class="n">databaseTransaction</span><span class="p">(</span><span class="n">a</span><span class="p">.</span><span class="n">database</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">a</span><span class="p">.</span><span class="n">services</span><span class="p">.</span><span class="n">recordTransactions</span><span class="p">(</span><span class="n">dummy1</span><span class="p">,</span> <span class="n">dummy2</span><span class="p">)</span>
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<span class="p">}</span>
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<span class="k">return</span> <span class="n">Pair</span><span class="p">(</span><span class="n">dummy1</span><span class="p">,</span> <span class="n">dummy2</span><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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<p>We’re using the <code class="docutils literal"><span class="pre">DummyContract</span></code>, a simple test smart contract which stores a single number in its states, along
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with ownership and issuer information. You can issue such states, exit them and re-assign ownership (move them).
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It doesn’t do anything else. This code simply creates a transaction that issues a dummy state (the issuer is
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<code class="docutils literal"><span class="pre">MEGA_CORP</span></code>, a pre-defined unit test identity), signs it with the test notary and MegaCorp keys and then
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converts the builder to the final <code class="docutils literal"><span class="pre">SignedTransaction</span></code>. It then does so again, but this time instead of issuing
|
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it re-assigns ownership instead. The chain of two transactions is finally committed to node A by sending them
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directly to the <code class="docutils literal"><span class="pre">a.services.recordTransaction</span></code> method (note that this method doesn’t check the transactions are
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valid) inside a <code class="docutils literal"><span class="pre">databaseTransaction</span></code>. All node flows run within a database transaction in the nodes themselves,
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but any time we need to use the database directly from a unit test, you need to provide a database transaction as shown
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here.</p>
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<p>And that’s it: you can explore the documentation for the <a class="reference external" href="api/kotlin/corda/net.corda.testing.node/-mock-network/index.html">MockNetwork API</a> here.</p>
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