86 lines
3 KiB
Markdown
86 lines
3 KiB
Markdown
# Eclipse Cyclone DDS Multi Process Testing
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Some features and functionalities of Cyclone DDS can only be tested when
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there's communication between processes. Examples are durability, security,
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etc. To really make sure that these kind of features work, extended tests
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with multiple processes are needed.
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This results in a number of [requirements](mpt_req.md).
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There doesn't seem to be a 3rd party test framework that addresses our
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requirements in a satisfactory manner. Therefore, it was decided to create
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our own Multi Process Testing (MPT) framework.
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This document will provide an overview of the MPT framework.
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## Overview
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An MPT application is basically divided into two components
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1. Tests
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2. Runner
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The Tests are created by the developer. They don't need to worry about the
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process management. They only have to provide process entry point(s), tests
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and test processes that use these entry points. E.g.
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```cpp
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MPT_ProcessEntry(publisher, MPT_Args(int domain))
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{
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/* Publish a sample on the given domain. */
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MPT_ASSERT(success, "publisher failed");
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}
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MPT_ProcessEntry(subscriber, MPT_Args(int domain))
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{
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/* Subscribe to a sample from the given domain. */
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MPT_ASSERT(success, "subscriber failed");
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}
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MPT_TestProcess(helloworld, domain0, pub, publisher, MPT_ArgValues(0));
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MPT_TestProcess(helloworld, domain0, sub, subscriber, MPT_ArgValues(0));
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MPT_Test(helloworld, domain0);
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MPT_TestProcess(helloworld, domain42, pub, publisher, MPT_ArgValues(42));
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MPT_TestProcess(helloworld, domain42, sub, subscriber, MPT_ArgValues(42));
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MPT_Test(helloworld, domain42);
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```
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There are more options, but see the
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[usage test](../../src/mpt/tests/self/usage.c) for more elaborate examples.
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CMake will identify suites, tests and processes depending on those MPT
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macros.<br>
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It'll use that to generate part of the MPT Runner. The Runner takes care
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of starting test(s) and handling the process management.
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The runner also takes care of preparing IPC between test processes so that
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these processes can sync if they need to (NB, this will be a future extension).
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#### Suite-Test-Process tree
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A process is related to a test and that test is related to a suite.<br>
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A suite can have multiple tests and tests can have multiple processes.<br>
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This results in the following tree quite naturally.
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<img src="pictures/mpt_tree.png" alt="Suite-Test-Process tree">
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#### Test execution
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There are 3 main ways to start an MPT application.
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1. Without argument.<br>
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All tests will be run.
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2. With suite and/or test name patterns as arguments.<br>
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A subset of tests will be run depending on the provided patterns.<br>
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This allows ctest to execute single tests.
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3. With a specific suite/test/process combination as arguments.<br>
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An user will normally not use this.
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The third option is used by the MPT application itself to start a specific
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test related process. It does so by restarting itself with the proper
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suite/test/process combination as indicated by the test. This results
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in the following flow.
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<img src="pictures/mpt_flow.png" alt="MPT application flow">
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