cmake: test Python interface

test/CMakeLists.txt

@@ -28,3 +28,36 @@ target_link_libraries(
   test_runner PRIVATE mtime_check mtime::mtime Check::Interface
 )
 add_test(NAME test_runner COMMAND test_runner)
+
+if(MTIME_ENABLE_PYTHON)
+  find_package(UnixCommands)
+  if(NOT BASH)
+    message(
+      FATAL_ERROR
+        "Could not find the Bash interpreter required for the Python tests"
+    )
+  endif()
+  include(AutoconfConfigure)
+  set(test_python_tmp
+      "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/mtime/test_python.sh"
+  )
+  autoconf_configure(
+    INPUTS ${CMAKE_CURRENT_SOURCE_DIR}/test_python.sh.in
+    OUTPUTS ${test_python_tmp}
+    VARIABLES SHELL ENABLE_PYTHON_FALSE abs_top_builddir PYTHON
+    VALUES "${BASH}" "#" "${PROJECT_BINARY_DIR}" "${Python_EXECUTABLE}"
+  )
+  file(
+    COPY ${test_python_tmp}
+    DESTINATION ${CMAKE_CURRENT_BINARY_DIR}
+    FILE_PERMISSIONS
+      OWNER_READ
+      OWNER_WRITE
+      OWNER_EXECUTE
+      GROUP_READ
+      GROUP_EXECUTE
+      WORLD_READ
+      WORLD_EXECUTE
+  )
+  add_test(NAME test_python.sh COMMAND test_python.sh)
+endif()