pytest target: add USE_TERMINAL flag

The added flag enables non-buffered console output when using Ninja

tests/CMakeLists.txt

@@ -162,9 +162,15 @@ if(NOT PYBIND11_PYTEST_FOUND)
   set(PYBIND11_PYTEST_FOUND TRUE CACHE INTERNAL "")
 endif()
 
+if(CMAKE_VERSION VERSION_LESS 3.2)
+  set(PYBIND11_USES_TERMINAL "")
+else()
+  set(PYBIND11_USES_TERMINAL "USES_TERMINAL")
+endif()
+
 # A single command to compile and run the tests
 add_custom_target(pytest COMMAND ${PYTHON_EXECUTABLE} -m pytest ${PYBIND11_PYTEST_FILES}
-                  DEPENDS pybind11_tests WORKING_DIRECTORY ${testdir})
+                  DEPENDS pybind11_tests WORKING_DIRECTORY ${testdir} ${PYBIND11_USES_TERMINAL})
 
 if(PYBIND11_TEST_OVERRIDE)
   add_custom_command(TARGET pytest POST_BUILD

tests/test_enum.py

@@ -116,6 +116,7 @@ def test_binary_operators():
     assert state2 == -7
     assert int(state ^ state2) == -1
 
+
 def test_enum_to_int():
     from pybind11_tests import Flags, ClassWithUnscopedEnum
     from pybind11_tests import test_enum_to_int, test_enum_to_uint, test_enum_to_long_long