A Discrete-Event Network Simulator
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example-as-test.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2020 Lawrence Livermore National Laboratory
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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* Author: Peter D. Barnes, Jr. <pdbarnes@llnl.gov>
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*/
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#ifndef NS3_EXAMPLE_AS_TEST_SUITE_H
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#define NS3_EXAMPLE_AS_TEST_SUITE_H
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#include "
test.h
"
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#include <string>
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/**
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* \file
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* \ingroup testing
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* Enable examples to be run as meaningful tests.
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* Declaration of classes ns3::ExampleAsTestSuite and ns3::ExampleAsTestCase.
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*/
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namespace
ns3
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{
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/**
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* \ingroup testing
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* Execute an example program as a test, by comparing the output
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* to a reference file.
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*
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* User can subclass and override the GetCommandTemplate() and
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* GetPostProcessingCommand() methods if more complex
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* example invocation patterns are required.
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*
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* \see examples-as-tests-test-suite.cc
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*/
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class
ExampleAsTestCase
:
public
TestCase
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{
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public
:
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/**
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* Constructor.
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* \param [in] name The test case name, typically the program name
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* and summary of the arguments, such as `my-example-foo`
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* \param [in] program The actual example program names, such as `my-example`
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* \param [in] dataDir The location of the reference file.
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* This is normally provided by the symbol
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* `NS_TEST_SOURCEDIR` in the `module-examples-test-suite.cc`
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* file.
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* The reference file should be named after
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* the test case name,
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* for example `my-example-foo.log`. If you use
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* the `--update` argument to `test.py` or
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* `test-runner` the reference file will be created
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* with the correct name.
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* \param [in] args Any additional arguments to the program.
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* \param [in] shouldNotErr Whether an error return status should be
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* considered a test failure. This is useful when testing
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* error detection which might return a non-zero status.
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* The output (on `std::cout` and `std::cerr`) will
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* be compared to the reference logs as normal.
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*/
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ExampleAsTestCase
(
const
std::string name,
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const
std::string program,
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const
std::string dataDir,
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const
std::string args =
""
,
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const
bool
shouldNotErr =
true
);
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/** Destructor. */
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~ExampleAsTestCase
()
override
;
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/**
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* Customization point for more complicated patterns
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* to invoke the example program.
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*
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* \returns The string to be given to the `ns3 --command-template=` argument.
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*/
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virtual
std::string
GetCommandTemplate
()
const
;
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/**
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* Customization point for tests requiring post-processing of stdout.
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*
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* For example to sort return `"| sort"`
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*
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* One common case is to mask memory addresses, which can change
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* when things are built on different platforms, recompiled locally,
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* or even from run to run. A simple post-processing filter could be
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*
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* `"| sed -E 's/0x[0-9a-fA-F]{8,}/0x-address/g'"`
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*
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* Default is `""`, no additional processing.
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*
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* \returns The string of post-processing commands
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*/
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virtual
std::string
GetPostProcessingCommand
()
const
;
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// Inherited
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void
DoRun
()
override
;
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protected
:
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std::string
m_program
;
/**< The program to run. */
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std::string
m_dataDir
;
/**< The source directory for the test. */
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std::string
m_args
;
/**< Any additional arguments to the program. */
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bool
m_shouldNotErr
;
/**< Whether error return status is a test failure. */
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};
// class ExampleAsTestCase
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/**
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* \ingroup testing
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* Execute an example program as a test suite.
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*
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* You can use this TestSuite to add an example to the test suite with
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* checking of the example output (`std::out` and `std::err`). This
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* is an alternative to adding an example using the
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* `examples-to-run.py` file. The key difference between the two
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* methods is what criteria is used to for success. Examples added to
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* `examples-to-run.py` will be run and the exit status checked
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* (non-zero indicates failure). ExampleAsTestSuite adds checking of
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* output against a specified known "good" reference file.
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*
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* \warning If you are thinking about using this class, strongly
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* consider using a standard test instead. The TestSuite class has
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* better checking using the NS_TEST_* macros and in almost all cases
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* is the better approach. If your test can be done with a TestSuite
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* class you will be asked by the reviewers to rewrite the test when
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* you do a pull request.
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*
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* \par Test Addition
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*
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* To use an example program as a test you need to create a test suite
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* file and add it to the appropriate list in your module CMakeLists.txt
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* file. The "good" output reference file needs to be generated for
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* detecting regressions.
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*
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* Let's assume your module is called `mymodule`, and the example
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* program is `mymodule/examples/mod-example.cc`. First you should
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* create a test file `mymodule/test/mymodule-examples-test-suite.cc`
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* which looks like this:
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*
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* \code{.cpp}
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* #include "ns3/example-as-test.h"
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* static ns3::ExampleAsTestSuite g_modExampleOne("mymodule-example-mod-example-one",
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* "mod-example", NS_TEST_SOURCEDIR, "--arg-one");
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* static ns3::ExampleAsTestSuite g_modExampleTwo("mymodule-example-mod-example-two",
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* "mod-example", NS_TEST_SOURCEDIR, "--arg-two"); \endcode
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*
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* The arguments to the constructor are the name of the test suite, the
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* example to run, the directory that contains the "good" reference file
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* (the macro `NS_TEST_SOURCEDIR` is normally the correct directory),
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* and command line arguments for the example. In the preceding code
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* the same example is run twice with different arguments.
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*
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* You then need to add that newly created test suite file to the list
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* of test sources in `mymodule/CMakeLists.txt`. Building of examples
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* is an option so you need to guard the inclusion of the test suite:
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*
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* \code{.py}
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* if (bld.env['ENABLE_EXAMPLES']):
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* module.source.append('model/mymodule-examples-test-suite.cc')
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* \endcode
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*
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* Since you modified a CMakeLists.txt file you need to reconfigure and
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* rebuild everything.
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*
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* You just added new tests so you will need to generate the "good"
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* output reference files that will be used to verify the example:
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*
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* `./test.py --suite="mymodule-example-*" --update`
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*
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* This will run all tests starting with "mymodule-example-" and save
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* new "good" reference files. Updating the reference file should be
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* done when you create the test and whenever output changes. When
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* updating the reference output you should inspect it to ensure that
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* it is valid. The reference files should be committed with the new
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* test.
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*
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* \par Test Verification
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*
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* You can run the test with the standard `test.py` script. For
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* example to run the suites you just added:
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*
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* `./test.py --suite="mymodule-example-*"`
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*
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* This will run all `mymodule-example-...` tests and report whether they
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* produce output matching the reference files.
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*
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* \par Writing good examples for testing
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*
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* When setting up an example for use by this class you should be very
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* careful about what output the example generates. For example,
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* writing output which includes simulation time (especially high
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* resolution time) makes the test sensitive to potentially minor
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* changes in event times. This makes the reference output hard to
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* verify and hard to keep up-to-date. Output as little as needed for
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* the example and include only behavioral state that is important for
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* determining if the example has run correctly.
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*
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*/
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class
ExampleAsTestSuite
:
public
TestSuite
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{
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public
:
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/**
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* \copydoc ExampleAsTestCase::ExampleAsTestCase
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* \param [in] duration Amount of time this test takes to execute
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* (defaults to QUICK).
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*/
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ExampleAsTestSuite
(
const
std::string name,
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const
std::string program,
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const
std::string dataDir,
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const
std::string args =
""
,
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const
Duration
duration =
Duration::QUICK
,
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const
bool
shouldNotErr =
true
);
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};
// class ExampleAsTestSuite
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}
// namespace ns3
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#endif
/* NS3_EXAMPLE_TEST_SUITE_H */
ns3::ExampleAsTestCase
Execute an example program as a test, by comparing the output to a reference file.
Definition
example-as-test.h:38
ns3::ExampleAsTestCase::GetCommandTemplate
virtual std::string GetCommandTemplate() const
Customization point for more complicated patterns to invoke the example program.
Definition
example-as-test.cc:55
ns3::ExampleAsTestCase::m_shouldNotErr
bool m_shouldNotErr
Whether error return status is a test failure.
Definition
example-as-test.h:103
ns3::ExampleAsTestCase::GetPostProcessingCommand
virtual std::string GetPostProcessingCommand() const
Customization point for tests requiring post-processing of stdout.
Definition
example-as-test.cc:64
ns3::ExampleAsTestCase::DoRun
void DoRun() override
Implementation to actually run this TestCase.
Definition
example-as-test.cc:72
ns3::ExampleAsTestCase::ExampleAsTestCase
ExampleAsTestCase(const std::string name, const std::string program, const std::string dataDir, const std::string args="", const bool shouldNotErr=true)
Constructor.
Definition
example-as-test.cc:35
ns3::ExampleAsTestCase::m_args
std::string m_args
Any additional arguments to the program.
Definition
example-as-test.h:102
ns3::ExampleAsTestCase::m_dataDir
std::string m_dataDir
The source directory for the test.
Definition
example-as-test.h:101
ns3::ExampleAsTestCase::m_program
std::string m_program
The program to run.
Definition
example-as-test.h:100
ns3::ExampleAsTestCase::~ExampleAsTestCase
~ExampleAsTestCase() override
Destructor.
Definition
example-as-test.cc:49
ns3::ExampleAsTestSuite
Execute an example program as a test suite.
Definition
example-as-test.h:199
ns3::ExampleAsTestSuite::ExampleAsTestSuite
ExampleAsTestSuite(const std::string name, const std::string program, const std::string dataDir, const std::string args="", const Duration duration=Duration::QUICK, const bool shouldNotErr=true)
Constructor.
Definition
example-as-test.cc:140
ns3::TestCase
encapsulates test code
Definition
test.h:1050
ns3::TestCase::Duration
Duration
How long the test takes to execute.
Definition
test.h:1054
ns3::TestCase::Duration::QUICK
@ QUICK
Fast test.
ns3::TestSuite
A suite of tests to run.
Definition
test.h:1267
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
test.h
ns3::TestCase, ns3::TestSuite, ns3::TestRunner declarations, and NS_TEST_ASSERT macro definitions.
src
core
model
example-as-test.h
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