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3260d9f2c4
* Introduce public subset of config to tweak config via mock net work without exposing internal node config. * Removal of functions exposing (internal) NodeConfiguration from the public test API * Code review fixes * Blank lines removed * Documented mock network API change in upgrade notes. * Updated documentation and API doc. * More documentation/API doc
524 lines
23 KiB
ReStructuredText
524 lines
23 KiB
ReStructuredText
.. highlight:: kotlin
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<script type="text/javascript" src="_static/jquery.js"></script>
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<script type="text/javascript" src="_static/codesets.js"></script>
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API: Testing
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============
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.. contents::
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Flow testing
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------------
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MockNetwork
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^^^^^^^^^^^
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Flow testing can be fully automated using a ``MockNetwork`` composed of ``StartedMockNode`` nodes. Each
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``StartedMockNode`` behaves like a regular Corda node, but its services are either in-memory or mocked out.
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A ``MockNetwork`` is created as follows:
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.. container:: codeset
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.. sourcecode:: kotlin
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class FlowTests {
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private lateinit var mockNet: MockNetwork
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@Before
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fun setup() {
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network = MockNetwork(listOf("my.cordapp.package", "my.other.cordapp.package"))
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}
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}
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.. sourcecode:: java
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public class IOUFlowTests {
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private MockNetwork network;
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@Before
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public void setup() {
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network = new MockNetwork(ImmutableList.of("my.cordapp.package", "my.other.cordapp.package"));
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}
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}
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The ``MockNetwork`` requires at a minimum a list of packages. Each package is packaged into a CorDapp JAR and installed
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as a CorDapp on each ``StartedMockNode``.
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Configuring the ``MockNetwork``
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The ``MockNetwork`` is configured automatically. You can tweak its configuration using a ``MockNetworkParameters``
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object, or by using named parameters in Kotlin:
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.. container:: codeset
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.. sourcecode:: kotlin
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val network = MockNetwork(
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// A list of packages to scan. Any contracts, flows and Corda services within these
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// packages will be automatically available to any nodes within the mock network
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cordappPackages = listOf("my.cordapp.package", "my.other.cordapp.package"),
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// If true then each node will be run in its own thread. This can result in race conditions in your
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// code if not carefully written, but is more realistic and may help if you have flows in your app that
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// do long blocking operations.
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threadPerNode = false,
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// The notaries to use on the mock network. By default you get one mock notary and that is usually
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// sufficient.
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notarySpecs = listOf(MockNetworkNotarySpec(DUMMY_NOTARY_NAME)),
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// If true then messages will not be routed from sender to receiver until you use the
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// [MockNetwork.runNetwork] method. This is useful for writing single-threaded unit test code that can
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// examine the state of the mock network before and after a message is sent, without races and without
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// the receiving node immediately sending a response.
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networkSendManuallyPumped = false,
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// How traffic is allocated in the case where multiple nodes share a single identity, which happens for
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// notaries in a cluster. You don't normally ever need to change this: it is mostly useful for testing
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// notary implementations.
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servicePeerAllocationStrategy = InMemoryMessagingNetwork.ServicePeerAllocationStrategy.Random())
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val network2 = MockNetwork(
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// A list of packages to scan. Any contracts, flows and Corda services within these
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// packages will be automatically available to any nodes within the mock network
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listOf("my.cordapp.package", "my.other.cordapp.package"), MockNetworkParameters(
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// If true then each node will be run in its own thread. This can result in race conditions in your
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// code if not carefully written, but is more realistic and may help if you have flows in your app that
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// do long blocking operations.
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threadPerNode = false,
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// The notaries to use on the mock network. By default you get one mock notary and that is usually
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// sufficient.
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notarySpecs = listOf(MockNetworkNotarySpec(DUMMY_NOTARY_NAME)),
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// If true then messages will not be routed from sender to receiver until you use the
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// [MockNetwork.runNetwork] method. This is useful for writing single-threaded unit test code that can
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// examine the state of the mock network before and after a message is sent, without races and without
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// the receiving node immediately sending a response.
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networkSendManuallyPumped = false,
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// How traffic is allocated in the case where multiple nodes share a single identity, which happens for
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// notaries in a cluster. You don't normally ever need to change this: it is mostly useful for testing
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// notary implementations.
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servicePeerAllocationStrategy = InMemoryMessagingNetwork.ServicePeerAllocationStrategy.Random())
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)
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.. sourcecode:: java
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MockNetwork network = MockNetwork(
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// A list of packages to scan. Any contracts, flows and Corda services within these
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// packages will be automatically available to any nodes within the mock network
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ImmutableList.of("my.cordapp.package", "my.other.cordapp.package"),
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new MockNetworkParameters()
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// If true then each node will be run in its own thread. This can result in race conditions in
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// your code if not carefully written, but is more realistic and may help if you have flows in
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// your app that do long blocking operations.
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.setThreadPerNode(false)
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// The notaries to use on the mock network. By default you get one mock notary and that is
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// usually sufficient.
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.setNotarySpecs(ImmutableList.of(new MockNetworkNotarySpec(DUMMY_NOTARY_NAME)))
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// If true then messages will not be routed from sender to receiver until you use the
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// [MockNetwork.runNetwork] method. This is useful for writing single-threaded unit test code
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// that can examine the state of the mock network before and after a message is sent, without
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// races and without the receiving node immediately sending a response.
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.setNetworkSendManuallyPumped(false)
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// How traffic is allocated in the case where multiple nodes share a single identity, which
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// happens for notaries in a cluster. You don't normally ever need to change this: it is mostly
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// useful for testing notary implementations.
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.setServicePeerAllocationStrategy(new InMemoryMessagingNetwork.ServicePeerAllocationStrategy.Random()));
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Adding nodes to the network
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Nodes are created on the ``MockNetwork`` using:
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.. container:: codeset
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.. sourcecode:: kotlin
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class FlowTests {
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private lateinit var mockNet: MockNetwork
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lateinit var nodeA: StartedMockNode
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lateinit var nodeB: StartedMockNode
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@Before
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fun setup() {
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network = MockNetwork(listOf("my.cordapp.package", "my.other.cordapp.package"))
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nodeA = network.createPartyNode()
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// We can optionally give the node a name.
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nodeB = network.createPartyNode(CordaX500Name("Bank B", "London", "GB"))
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}
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}
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.. sourcecode:: java
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public class IOUFlowTests {
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private MockNetwork network;
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private StartedMockNode a;
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private StartedMockNode b;
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@Before
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public void setup() {
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network = new MockNetwork(ImmutableList.of("my.cordapp.package", "my.other.cordapp.package"));
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nodeA = network.createPartyNode(null);
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// We can optionally give the node a name.
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nodeB = network.createPartyNode(new CordaX500Name("Bank B", "London", "GB"));
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}
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}
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Nodes added using ``createPartyNode`` are provided a default set of node parameters. However, it is also possible to
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provide different parameters to each node using the following methods on ``MockNetwork``:
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.. container:: codeset
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.. sourcecode:: kotlin
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/**
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* Create a started node with the given parameters.
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*
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* @param legalName The node's legal name.
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* @param forcedID A unique identifier for the node.
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* @param entropyRoot The initial entropy value to use when generating keys. Defaults to an (insecure) random value,
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* but can be overridden to cause nodes to have stable or colliding identity/service keys.
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* @param configOverrides Add/override the default configuration/behaviour of the node
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* @param extraCordappPackages Extra CorDapp packages to add for this node.
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*/
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@JvmOverloads
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fun createNode(legalName: CordaX500Name? = null,
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forcedID: Int? = null,
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entropyRoot: BigInteger = BigInteger.valueOf(random63BitValue()),
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configOverrides: MockNodeConfigOverrides? = null,
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extraCordappPackages: List<String> = emptyList()
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): StartedMockNode
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/** Create a started node with the given parameters. **/
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fun createNode(parameters: MockNodeParameters = MockNodeParameters()): StartedMockNode
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As you can see above, parameters can be added individually or encapsulated within a ``MockNodeParameters`` object. Of
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particular interest are ``configOverrides`` which allow you to override some of the default node
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configuration options. Please refer to the ``MockNodeConfigOverrides`` class for details what can currently be overridden.
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Also, the ``extraCordappPackages`` parameter allows you to add extra CorDapps to a
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specific node. This is useful when you wish for all nodes to load a common CorDapp but for a subset of nodes to load
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CorDapps specific to their role in the network.
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Running the network
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^^^^^^^^^^^^^^^^^^^
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When using a ``MockNetwork``, you must be careful to ensure that all the nodes have processed all the relevant messages
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before making assertions about the result of performing some action. For example, if you start a flow to update the ledger
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but don't wait until all the nodes involved have processed all the resulting messages, your nodes' vaults may not be in
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the state you expect.
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When ``networkSendManuallyPumped`` is set to ``false``, you must manually initiate the processing of received messages.
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You manually process received messages as follows:
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* ``StartedMockNode.pumpReceive()`` processes a single message from the node's queue
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* ``MockNetwork.runNetwork()`` processes all the messages in every node's queue until there are no further messages to
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process
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When ``networkSendManuallyPumped`` is set to ``true``, nodes will automatically process the messages they receive. You
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can block until all messages have been processed using ``MockNetwork.waitQuiescent()``.
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.. warning:: If ``threadPerNode`` is set to ``true``, ``networkSendManuallyPumped`` must also be set to ``true``.
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Running flows
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^^^^^^^^^^^^^
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A ``StartedMockNode`` starts a flow using the ``StartedNodeServices.startFlow`` method. This method returns a future
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representing the output of running the flow.
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.. container:: codeset
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.. sourcecode:: kotlin
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val signedTransactionFuture = nodeA.services.startFlow(IOUFlow(iouValue = 99, otherParty = nodeBParty))
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.. sourcecode:: java
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CordaFuture<SignedTransaction> future = startFlow(a.getServices(), new ExampleFlow.Initiator(1, nodeBParty));
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The network must then be manually run before retrieving the future's value:
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.. container:: codeset
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.. sourcecode:: kotlin
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val signedTransactionFuture = nodeA.services.startFlow(IOUFlow(iouValue = 99, otherParty = nodeBParty))
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// Assuming network.networkSendManuallyPumped == false.
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network.runNetwork()
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val signedTransaction = future.get();
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.. sourcecode:: java
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CordaFuture<SignedTransaction> future = startFlow(a.getServices(), new ExampleFlow.Initiator(1, nodeBParty));
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// Assuming network.networkSendManuallyPumped == false.
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network.runNetwork();
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SignedTransaction signedTransaction = future.get();
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Accessing ``StartedMockNode`` internals
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Querying a node's vault
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~~~~~~~~~~~~~~~~~~~~~~~
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Recorded states can be retrieved from the vault of a ``StartedMockNode`` using:
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.. container:: codeset
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.. sourcecode:: kotlin
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val myStates = nodeA.services.vaultService.queryBy<MyStateType>().states
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.. sourcecode:: java
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List<MyStateType> myStates = node.getServices().getVaultService().queryBy(MyStateType.class).getStates();
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This allows you to check whether a given state has (or has not) been stored, and whether it has the correct attributes.
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Examining a node's transaction storage
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Recorded transactions can be retrieved from the transaction storage of a ``StartedMockNode`` using:
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.. container:: codeset
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.. sourcecode:: kotlin
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val transaction = nodeA.services.validatedTransactions.getTransaction(transaction.id)
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.. sourcecode:: java
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SignedTransaction transaction = nodeA.getServices().getValidatedTransactions().getTransaction(transaction.getId())
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This allows you to check whether a given transaction has (or has not) been stored, and whether it has the correct
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attributes.
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This allows you to check whether a given state has (or has not) been stored, and whether it has the correct attributes.
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Further examples
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^^^^^^^^^^^^^^^^
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* See the flow testing tutorial :doc:`here <flow-testing>`
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* See the oracle tutorial :doc:`here <oracles>` for information on testing ``@CordaService`` classes
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* Further examples are available in the Example CorDapp in
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`Java <https://github.com/corda/cordapp-example/blob/release-V3/java-source/src/test/java/com/example/flow/IOUFlowTests.java>`_ and
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`Kotlin <https://github.com/corda/cordapp-example/blob/release-V3/kotlin-source/src/test/kotlin/com/example/flow/IOUFlowTests.kt>`_
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Contract testing
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----------------
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The Corda test framework includes the ability to create a test ledger by calling the ``ledger`` function
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on an implementation of the ``ServiceHub`` interface.
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Test identities
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^^^^^^^^^^^^^^^
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You can create dummy identities to use in test transactions using the ``TestIdentity`` class:
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.. container:: codeset
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.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
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:language: kotlin
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:start-after: DOCSTART 14
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:end-before: DOCEND 14
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:dedent: 8
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.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
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:language: java
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:start-after: DOCSTART 14
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:end-before: DOCEND 14
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:dedent: 4
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``TestIdentity`` exposes the following fields and methods:
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.. container:: codeset
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.. sourcecode:: kotlin
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val identityParty: Party = bigCorp.party
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val identityName: CordaX500Name = bigCorp.name
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val identityPubKey: PublicKey = bigCorp.publicKey
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val identityKeyPair: KeyPair = bigCorp.keyPair
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val identityPartyAndCertificate: PartyAndCertificate = bigCorp.identity
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.. sourcecode:: java
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Party identityParty = bigCorp.getParty();
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CordaX500Name identityName = bigCorp.getName();
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PublicKey identityPubKey = bigCorp.getPublicKey();
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KeyPair identityKeyPair = bigCorp.getKeyPair();
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PartyAndCertificate identityPartyAndCertificate = bigCorp.getIdentity();
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You can also create a unique ``TestIdentity`` using the ``fresh`` method:
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.. container:: codeset
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.. sourcecode:: kotlin
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val uniqueTestIdentity: TestIdentity = TestIdentity.fresh("orgName")
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.. sourcecode:: java
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TestIdentity uniqueTestIdentity = TestIdentity.Companion.fresh("orgName");
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MockServices
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^^^^^^^^^^^^
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A mock implementation of ``ServiceHub`` is provided in ``MockServices``. This is a minimal ``ServiceHub`` that
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suffices to test contract logic. It has the ability to insert states into the vault, query the vault, and
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construct and check transactions.
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.. container:: codeset
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.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
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:language: kotlin
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:start-after: DOCSTART 11
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:end-before: DOCEND 11
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:dedent: 4
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.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
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:language: java
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:start-after: DOCSTART 11
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:end-before: DOCEND 11
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:dedent: 4
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Alternatively, there is a helper constructor which just accepts a list of ``TestIdentity``. The first identity provided is
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the identity of the node whose ``ServiceHub`` is being mocked, and any subsequent identities are identities that the node
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knows about. Only the calling package is scanned for cordapps and a test ``IdentityService`` is created
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for you, using all the given identities.
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.. container:: codeset
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.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
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:language: kotlin
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:start-after: DOCSTART 12
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:end-before: DOCEND 12
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:dedent: 4
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.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
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:language: java
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:start-after: DOCSTART 12
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:end-before: DOCEND 12
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:dedent: 4
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Writing tests using a test ledger
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The ``ServiceHub.ledger`` extension function allows you to create a test ledger. Within the ledger wrapper you can create
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transactions using the ``transaction`` function. Within a transaction you can define the ``input`` and
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``output`` states for the transaction, alongside any commands that are being executed, the ``timeWindow`` in which the
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transaction has been executed, and any ``attachments``, as shown in this example test:
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.. container:: codeset
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.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
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:language: kotlin
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:start-after: DOCSTART 13
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:end-before: DOCEND 13
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:dedent: 4
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.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
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:language: java
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:start-after: DOCSTART 13
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:end-before: DOCEND 13
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:dedent: 4
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Once all the transaction components have been specified, you can run ``verifies()`` to check that the given transaction is valid.
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Checking for failure states
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In order to test for failures, you can use the ``failsWith`` method, or in Kotlin the ``fails with`` helper method, which
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assert that the transaction fails with a specific error. If you just want to assert that the transaction has failed without
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verifying the message, there is also a ``fails`` method.
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.. container:: codeset
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.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
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:language: kotlin
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:start-after: DOCSTART 4
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:end-before: DOCEND 4
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:dedent: 4
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.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
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:language: java
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:start-after: DOCSTART 4
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:end-before: DOCEND 4
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:dedent: 4
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.. note::
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The transaction DSL forces the last line of the test to be either a ``verifies`` or ``fails with`` statement.
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Testing multiple scenarios at once
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Within a single transaction block, you can assert several times that the transaction constructed so far either passes or
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fails verification. For example, you could test that a contract fails to verify because it has no output states, and then
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add the relevant output state and check that the contract verifies successfully, as in the following example:
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.. container:: codeset
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.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
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:language: kotlin
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:start-after: DOCSTART 5
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:end-before: DOCEND 5
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:dedent: 4
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.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
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:language: java
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:start-after: DOCSTART 5
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:end-before: DOCEND 5
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:dedent: 4
|
|
|
|
You can also use the ``tweak`` function to create a locally scoped transaction that you can make changes to
|
|
and then return to the original, unmodified transaction. As in the following example:
|
|
|
|
.. container:: codeset
|
|
|
|
.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
|
|
:language: kotlin
|
|
:start-after: DOCSTART 7
|
|
:end-before: DOCEND 7
|
|
:dedent: 4
|
|
|
|
.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
|
|
:language: java
|
|
:start-after: DOCSTART 7
|
|
:end-before: DOCEND 7
|
|
:dedent: 4
|
|
|
|
|
|
Chaining transactions
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
The following example shows that within a ``ledger``, you can create more than one ``transaction`` in order to test chains
|
|
of transactions. In addition to ``transaction``, ``unverifiedTransaction`` can be used, as in the example below, to create
|
|
transactions on the ledger without verifying them, for pre-populating the ledger with existing data. When chaining transactions,
|
|
it is important to note that even though a ``transaction`` ``verifies`` successfully, the overall ledger may not be valid. This can
|
|
be verified separately by placing a ``verifies`` or ``fails`` statement within the ``ledger`` block.
|
|
|
|
.. container:: codeset
|
|
|
|
.. literalinclude:: ../../docs/source/example-code/src/test/kotlin/net/corda/docs/kotlin/tutorial/testdsl/TutorialTestDSL.kt
|
|
:language: kotlin
|
|
:start-after: DOCSTART 9
|
|
:end-before: DOCEND 9
|
|
:dedent: 4
|
|
|
|
.. literalinclude:: ../../docs/source/example-code/src/test/java/net/corda/docs/java/tutorial/testdsl/TutorialTestDSL.java
|
|
:language: java
|
|
:start-after: DOCSTART 9
|
|
:end-before: DOCEND 9
|
|
:dedent: 4
|
|
|
|
|
|
Further examples
|
|
^^^^^^^^^^^^^^^^
|
|
|
|
* See the flow testing tutorial :doc:`here <tutorial-test-dsl>`
|
|
* Further examples are available in the Example CorDapp in
|
|
`Java <https://github.com/corda/cordapp-example/blob/release-V3/java-source/src/test/java/com/example/flow/IOUFlowTests.java>`_ and
|
|
`Kotlin <https://github.com/corda/cordapp-example/blob/release-V3/kotlin-source/src/test/kotlin/com/example/flow/IOUFlowTests.kt>`_
|