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186 lines
5.5 KiB
Markdown
186 lines
5.5 KiB
Markdown
<a id="top"></a>
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# CMake integration
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Because we use CMake to build Catch2, we also provide a couple of
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integration points for our users.
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1) Catch2 exports a (namespaced) CMake target
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2) Catch2's repository contains CMake scripts for automatic registration
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of `TEST_CASE`s in CTest
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## CMake target
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Catch2's CMake build exports an interface target `Catch2::Catch2`. Linking
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against it will add the proper include path and all necessary capabilities
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to the resulting binary.
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This means that if Catch2 has been installed on the system, it should be
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enough to do:
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```cmake
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find_package(Catch2 REQUIRED)
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target_link_libraries(tests Catch2::Catch2)
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```
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This target is also provided when Catch2 is used as a subdirectory.
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Assuming that Catch2 has been cloned to `lib/Catch2`:
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```cmake
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add_subdirectory(lib/Catch2)
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target_link_libraries(tests Catch2::Catch2)
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```
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## Automatic test registration
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Catch2's repository also contains two CMake scripts that help users
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with automatically registering their `TEST_CASE`s with CTest. They
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can be found in the `contrib` folder, and are
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1) `Catch.cmake` (and its dependency `CatchAddTests.cmake`)
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2) `ParseAndAddCatchTests.cmake`
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If Catch2 has been installed in system, both of these can be used after
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doing `find_package(Catch2 REQUIRED)`. Otherwise you need to add them
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to your CMake module path.
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### `Catch.cmake` and `AddCatchTests.cmake`
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`Catch.cmake` provides function `catch_discover_tests` to get tests from
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a target. This function works by running the resulting executable with
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`--list-test-names-only` flag, and then parsing the output to find all
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existing tests.
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#### Usage
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```cmake
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cmake_minimum_required(VERSION 3.5)
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project(baz LANGUAGES CXX VERSION 0.0.1)
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find_package(Catch2 REQUIRED)
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add_executable(foo test.cpp)
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target_link_libraries(foo Catch2::Catch2)
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include(CTest)
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include(Catch)
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catch_discover_tests(foo)
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```
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#### Customization
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`catch_discover_tests` can be given several extra argumets:
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```cmake
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catch_discover_tests(target
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[TEST_SPEC arg1...]
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[EXTRA_ARGS arg1...]
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[WORKING_DIRECTORY dir]
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[TEST_PREFIX prefix]
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[TEST_SUFFIX suffix]
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[PROPERTIES name1 value1...]
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[TEST_LIST var]
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)
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```
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* `TEST_SPEC arg1...`
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Specifies test cases, wildcarded test cases, tags and tag expressions to
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pass to the Catch executable alongside the `--list-test-names-only` flag.
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* `EXTRA_ARGS arg1...`
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Any extra arguments to pass on the command line to each test case.
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* `WORKING_DIRECTORY dir`
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Specifies the directory in which to run the discovered test cases. If this
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option is not provided, the current binary directory is used.
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* `TEST_PREFIX prefix`
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Specifies a _prefix_ to be added to the name of each discovered test case.
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This can be useful when the same test executable is being used in multiple
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calls to `catch_discover_tests()`, with different `TEST_SPEC` or `EXTRA_ARGS`.
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* `TEST_SUFFIX suffix`
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Same as `TEST_PREFIX`, except it specific the _suffix_ for the test names.
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Both `TEST_PREFIX` and `TEST_SUFFIX` can be specified at the same time.
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* `PROPERTIES name1 value1...`
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Specifies additional properties to be set on all tests discovered by this
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invocation of `catch_discover_tests`.
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* `TEST_LIST var`
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Make the list of tests available in the variable `var`, rather than the
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default `<target>_TESTS`. This can be useful when the same test
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executable is being used in multiple calls to `catch_discover_tests()`.
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Note that this variable is only available in CTest.
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### `ParseAndAddCatchTests.cmake`
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`ParseAndAddCatchTests` works by parsing all implementation files
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associated with the provided target, and registering them via CTest's
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`add_test`. This approach has some limitations, such as the fact that
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commented-out tests will be registered anyway.
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#### Usage
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```cmake
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cmake_minimum_required(VERSION 3.5)
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project(baz LANGUAGES CXX VERSION 0.0.1)
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find_package(Catch2 REQUIRED)
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add_executable(foo test.cpp)
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target_link_libraries(foo Catch2::Catch2)
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include(CTest)
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include(ParseAndAddCatchTests)
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ParseAndAddCatchTests(foo)
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```
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#### Customization
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`ParseAndAddCatchTests` provides some customization points:
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* `PARSE_CATCH_TESTS_VERBOSE` -- When `ON`, the script prints debug
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messages. Defaults to `OFF`.
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* `PARSE_CATCH_TESTS_NO_HIDDEN_TESTS` -- When `ON`, hidden tests (tests
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tagged with any of `[!hide]`, `[.]` or `[.foo]`) will not be registered.
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Defaults to `OFF`.
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* `PARSE_CATCH_TESTS_ADD_FIXTURE_IN_TEST_NAME` -- When `ON`, adds fixture
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class name to the test name in CTest. Defaults to `ON`.
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* `PARSE_CATCH_TESTS_ADD_TARGET_IN_TEST_NAME` -- When `ON`, adds target
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name to the test name in CTest. Defaults to `ON`.
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* `PARSE_CATCH_TESTS_ADD_TO_CONFIGURE_DEPENDS` -- When `ON`, adds test
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file to `CMAKE_CONFIGURE_DEPENDS`. This means that the CMake configuration
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step will be re-ran when the test files change, letting new tests be
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automatically discovered. Defaults to `OFF`.
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## CMake project options
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Catch2's CMake project also provides some options for other projects
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that consume it. These are
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* `CATCH_BUILD_EXAMPLES` -- When `ON`, Catch2's usage examples will be
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built. Defaults to `OFF`.
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* `CATCH_INSTALL_DOCS` -- When `ON`, Catch2's documentation will be
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included in the installation. Defaults to `ON`.
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* `CATCH_INSTALL_HELPERS` -- When `ON`, Catch2's contrib folder will be
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included in the installation. Defaults to `ON`.
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* `BUILD_TESTING` -- When `ON` and the project is not used as a subproject,
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Catch2's test binary will be built. Defaults to `ON`.
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---
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[Home](Readme.md#top)
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