The following is a detailed breakdown of the contents of our CMakeLists.txt:

1. We start out with a relatively compact CMakeLists.txt, which defines the six tests:

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)

# project name
project(recipe-09 LANGUAGES NONE)

# detect python
find_package(PythonInterp REQUIRED)

# define tests
enable_testing()

add_test(
  NAME feature-a
  COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/feature-a.py
  )
add_test(
  NAME feature-b
  COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/feature-b.py
  )
add_test(
  NAME feature-c
  COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/feature-c.py
  )
add_test(
  NAME feature-d
  COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/feature-d.py
  )

add_test(
  NAME benchmark-a
  COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/benchmark-a.py
  )

add_test(
  NAME benchmark-b
  COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/test/benchmark-b.py
  )

2. In addition, we give the shorter tests the label "quick" and the longer tests the label "long":

set_tests_properties(
  feature-a
  feature-b
  feature-c
  PROPERTIES
    LABELS "quick"
  )

set_tests_properties(
  feature-d
  benchmark-a
  benchmark-b
  PROPERTIES
    LABELS "long"
  )

3. We are now ready to run the test set, as follows:

$ mkdir -p build
$ cd build
$ cmake ..
$ ctest

    Start 1: feature-a
1/6 Test #1: feature-a ........................ Passed 0.11 sec
    Start 2: feature-b
2/6 Test #2: feature-b ........................ Passed 0.11 sec
    Start 3: feature-c
3/6 Test #3: feature-c ........................ Passed 0.11 sec
    Start 4: feature-d
4/6 Test #4: feature-d ........................ Passed 0.51 sec
    Start 5: benchmark-a
5/6 Test #5: benchmark-a ...................... Passed 0.51 sec
    Start 6: benchmark-b
6/6 Test #6: benchmark-b ...................... Passed 0.51 sec

100% tests passed, 0 tests failed out of 6

Label Time Summary:
long = 1.54 sec*proc (3 tests)
quick = 0.33 sec*proc (3 tests)

Total Test time (real) = 1.87 sec