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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/bitcoin-s/bitcoin-s/blob/master/docs/testkit/testkit.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Testkit</h1></header><article><div><span><h2><a class="anchor" aria-hidden="true" id="philosphy-of-testkit"></a><a href="#philosphy-of-testkit" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Philosphy of Testkit</h2>
<p>The high level of of the bitcoin-s testkit is to mimic and provide functionality to test 3rd party applications.</p>
<p>There are other examples of these in the Scala ecosystem like the <code>akka-testkit</code> and <code>slick-testkit</code>.</p>
<p>We use this testkit to test bitcoin-s it self.</p>
<h3><a class="anchor" aria-hidden="true" id="testkit-for-bitcoind"></a><a href="#testkit-for-bitcoind" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Testkit for bitcoind</h3>
<p>This gives the ability to create and destroy <code>bitcoind</code> on the underlying operating system to test against.</p>
<p>Make sure you have run <code>sbt downloadBitcoind</code> before running this example, as you need access to the bitcoind binaries.</p>
<p>Our <a href="../../bitcoind-rpc/src/main/scala/org/bitcoins/rpc/client/common/BitcoindRpcClient.scala">BitcoindRpcClient</a> is tested with the functionality provided in the testkit.
A quick example of a useful utility method is <a href="../../bitcoind-rpc/src/main/scala/org/bitcoins/testkit/rpc/BitcoindRpcTestUtil.scala">BitcoindRpcTestUtil.startedBitcoindRpcClient()</a>.
This spins up a bitcoind regtest instance on machine and generates 101 blocks on that node.</p>
<p>This gives you the ability to start spending money immediately with that bitcoind node.</p>
<pre><code class="hljs css language-scala"><span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> system = <span class="hljs-type">ActorSystem</span>(<span class="hljs-string">"bitcoind-testkit-example"</span>)
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> ec = system.dispatcher
<span class="hljs-comment">//pick our bitcoind version we want to spin up</span>
<span class="hljs-comment">//you can pick older versions if you want</span>
<span class="hljs-comment">//we support versions 16-19</span>
<span class="hljs-keyword">val</span> bitcoindV = <span class="hljs-type">BitcoindVersion</span>.<span class="hljs-type">V19</span>
<span class="hljs-comment">//create an instance</span>
<span class="hljs-keyword">val</span> instance = <span class="hljs-type">BitcoindRpcTestUtil</span>.instance(versionOpt = <span class="hljs-type">Some</span>(bitcoindV))
<span class="hljs-comment">//now let's create an rpc client off of that instance</span>
<span class="hljs-keyword">val</span> bitcoindRpcClientF = <span class="hljs-type">BitcoindRpcTestUtil</span>.startedBitcoindRpcClient(instance)
<span class="hljs-comment">//yay! it's started. Now you can run tests against this.</span>
<span class="hljs-comment">//let's just grab the block count for an example</span>
<span class="hljs-keyword">val</span> blockCountF = <span class="hljs-keyword">for</span> {
bitcoind <- bitcoindRpcClientF
count <- bitcoind.getBlockCount
} <span class="hljs-keyword">yield</span> {
<span class="hljs-comment">//run a test against the block count</span>
assert(count > <span class="hljs-number">0</span>, <span class="hljs-string">s"Block count was not more than zero!"</span>)
}
<span class="hljs-comment">//when you are done, don't forget to destroy it! Otherwise it will keep running on the underlying os</span>
<span class="hljs-keyword">val</span> stoppedF = <span class="hljs-keyword">for</span> {
rpc <- bitcoindRpcClientF
_ <- blockCountF
stopped <- <span class="hljs-type">BitcoindRpcTestUtil</span>.stopServers(<span class="hljs-type">Vector</span>(rpc))
} <span class="hljs-keyword">yield</span> stopped
</code></pre>
<p>For more information on how the bitcoind rpc client works, see our <a href="/docs/rpc/rpc-bitcoind">bitcoind rpc docs</a></p>
<h3><a class="anchor" aria-hidden="true" id="testkit-for-eclair"></a><a href="#testkit-for-eclair" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Testkit for eclair</h3>
<p>We have similar utility methods for eclair. Eclair's testkit requires a bitcoind running (which we can spin up thanks to our bitcoind testkit).</p>
<p>Here is an example of spinning up an eclair lightning node, that is connected to a bitcoind and testing your lightning application.</p>
<p>Make sure to run <code>sbt downloadBitcoind downloadEclair</code> before running this so you have access to the underlying eclair binares</p>
<pre><code class="hljs css language-scala"><span class="hljs-comment">//Steps:</span>
<span class="hljs-comment">//1. Open and confirm channel on the underlying blockchain (regtest)</span>
<span class="hljs-comment">//2. pay an invoice</span>
<span class="hljs-comment">//3. Await until the payment is processed</span>
<span class="hljs-comment">//4. assert the node has received the payment</span>
<span class="hljs-comment">//5. cleanup</span>
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> system = <span class="hljs-type">ActorSystem</span>(<span class="hljs-string">"eclair-testkit-example"</span>)
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> ec = system.dispatcher
<span class="hljs-comment">//we need a bitcoind to connect eclair nodes to</span>
<span class="hljs-keyword">lazy</span> <span class="hljs-keyword">val</span> bitcoindRpcClientF: <span class="hljs-type">Future</span>[<span class="hljs-type">BitcoindRpcClient</span>] = {
<span class="hljs-keyword">for</span> {
cli <- <span class="hljs-type">EclairRpcTestUtil</span>.startedBitcoindRpcClient()
<span class="hljs-comment">// make sure we have enough money to open channels</span>
address <- cli.getNewAddress
_ <- cli.generateToAddress(<span class="hljs-number">200</span>, address)
} <span class="hljs-keyword">yield</span> cli
}
<span class="hljs-comment">//let's create two eclair nodes now</span>
<span class="hljs-keyword">val</span> clientF = <span class="hljs-keyword">for</span> {
bitcoind <- bitcoindRpcClientF
e <- <span class="hljs-type">EclairRpcTestUtil</span>.randomEclairClient(<span class="hljs-type">Some</span>(bitcoind))
} <span class="hljs-keyword">yield</span> e
<span class="hljs-keyword">val</span> otherClientF = <span class="hljs-keyword">for</span> {
bitcoind <- bitcoindRpcClientF
e <- <span class="hljs-type">EclairRpcTestUtil</span>.randomEclairClient(<span class="hljs-type">Some</span>(bitcoind))
} <span class="hljs-keyword">yield</span> e
<span class="hljs-comment">//great, setup done! Let's run the test</span>
<span class="hljs-comment">//to verify we can send a payment over the channel</span>
<span class="hljs-keyword">for</span> {
client <- clientF
otherClient <- otherClientF
_ <- <span class="hljs-type">EclairRpcTestUtil</span>.openAndConfirmChannel(clientF, otherClientF)
invoice <- otherClient.createInvoice(<span class="hljs-string">"abc"</span>, <span class="hljs-number">50.</span>msats)
info <- otherClient.getInfo
_ = assert(info.nodeId == invoice.nodeId)
infos <- client.getSentInfo(invoice.lnTags.paymentHash.hash)
_ = assert(infos.isEmpty)
paymentId <- client.payInvoice(invoice)
_ <- <span class="hljs-type">EclairRpcTestUtil</span>.awaitUntilPaymentSucceeded(client, paymentId)
sentInfo <- client.getSentInfo(invoice.lnTags.paymentHash.hash)
} <span class="hljs-keyword">yield</span> {
assert(sentInfo.head.amount == <span class="hljs-number">50.</span>msats)
}
<span class="hljs-comment">//don't forget to shutdown everything!</span>
<span class="hljs-keyword">val</span> stop1F = clientF.map(c => <span class="hljs-type">EclairRpcTestUtil</span>.shutdown(c))
<span class="hljs-keyword">val</span> stop2F = otherClientF.map(o => <span class="hljs-type">EclairRpcTestUtil</span>.shutdown(o))
<span class="hljs-keyword">val</span> stoppedBitcoindF = <span class="hljs-keyword">for</span> {
bitcoind <- bitcoindRpcClientF
_ <- <span class="hljs-type">BitcoindRpcTestUtil</span>.stopServers(<span class="hljs-type">Vector</span>(bitcoind))
} <span class="hljs-keyword">yield</span> ()
<span class="hljs-keyword">val</span> resultF = <span class="hljs-keyword">for</span> {
_ <- stop1F
_ <- stop2F
_ <- stoppedBitcoindF
_ <- system.terminate()
} <span class="hljs-keyword">yield</span> ()
<span class="hljs-type">Await</span>.result(resultF, <span class="hljs-number">180.</span>seconds)
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="testkit-for-core"></a><a href="#testkit-for-core" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Testkit for core</h3>
<p>The testkit functionality for our core module primary consists of generators for property based tests.</p>
<p>A generator is a piece of code that generates a random object for a data strucutre -- such as a <code>Transaction</code>.</p>
<p>There is also a robust set of generators available in the <a href="../../testkit/src/main/scala/org/bitcoins/testkit/core/gen">org.bitcoins.testkit.gen</a> package.
This allows you to integrate property based testing into your library and feel confident about implementing your application specific logic correctly.</p>
<p>You can see examples of us using these generators inside of testkit in our <a href="../../core-test/src/test/scala/org/bitcoins/core/crypto/ECPrivateKeyTest.scala">Private Key test cases</a></p>
<h3><a class="anchor" aria-hidden="true" id="other-modules"></a><a href="#other-modules" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Other modules</h3>
<p>You may find useful testkit functionality for other modules here</p>
<ol>
<li><a href="../../testkit/src/main/scala/org/bitcoins/testkit/chain/ChainUnitTest.scala">Chain</a></li>
<li><a href="../../testkit/src/main/scala/org/bitcoins/testkit/keymanager/KeyManagerUnitTest.scala">Key Manager</a></li>
<li><a href="../../testkit/src/main/scala/org/bitcoins/testkit/wallet/BitcoinSWalletTest.scala">Wallet</a></li>
<li><a href="../../testkit/src/main/scala/org/bitcoins/testkit/node/NodeUnitTest.scala">Node</a></li>
</ol>
<p>In general, you will find constructors and destructors of fixtures that can be useful when testing your applications
if yo uare using any of those modules.</p>
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