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Improve documentation about using Catch with CMake

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Also added a note about the `contrib/ParseAndAddCatchTests.cmake`
script.

Closes #882
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Martin Hořeňovský 2017-04-24 16:27:43 +02:00
parent 8014bf1124
commit 4cdb203ec3
1 changed files with 45 additions and 1 deletions
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46
docs/build-systems.md
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@ -56,8 +56,26 @@ Because of the incremental nature of Catch's test suites and ability to run spec
## CMake ## CMake
You can use the following CMake script to automatically fetch Catch from github and configure it as an external project: In general we recommend "vendoring" Catch's single-include releases inside your own repository. If you do this, the following example shows a minimal CMake project:
```CMake
cmake_minimum_required(VERSION 3.0)
project(cmake_test)
# Prepare "Catch" library for other executables
set(CATCH_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/catch)
add_library(Catch INTERFACE)
target_include_directories(Catch INTERFACE ${CATCH_INCLUDE_DIR})
# Make test executable
set(TEST_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/main.cpp)
add_executable(tests ${TEST_SOURCES})
target_link_libraries(tests Catch)
```
Note that it assumes that the path to the Catch's header is `catch/catch.hpp` from the `CMakeLists.txt` file.
You can also use the following CMake snippet to automatically fetch the entire Catch repository from github and configure it as an external project:
```CMake ```CMake
cmake_minimum_required(VERSION 2.8.8) cmake_minimum_required(VERSION 2.8.8)
project(catch_builder CXX) project(catch_builder CXX)
@ -90,6 +108,32 @@ include_directories(${CATCH_INCLUDE_DIR} ${COMMON_INCLUDES})
enable_testing(true) # Enables unit-testing. enable_testing(true) # Enables unit-testing.
``` ```
The advantage of this approach is that you can always automatically update Catch to the latest release. The disadvantage is that it means bringing in lot more than you need.
### Automatic test registration
If you are also using ctest, `contrib/ParseAndAddCatchTests.cmake` is a CMake script that attempts to parse your test files and automatically register all test cases, using tags as labels. This means that these
```cpp
TEST_CASE("Test1", "[unit]") {
int a = 1;
int b = 2;
REQUIRE(a == b);
}
TEST_CASE("Test2") {
int a = 1;
int b = 2;
REQUIRE(a == b);
}
TEST_CASE("Test3", "[a][b][c]") {
int a = 1;
int b = 2;
REQUIRE(a == b);
}
```
would be registered as 3 tests, `Test1`, `Test2` and `Test3`, and ctest 4 labels would be created, `a`, `b`, `c` and `unit`.
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