macOS needs longer pauses to register a file time change

tests/test_basics.py

     tmp_project.write('src/f.cpp', r'void f() {}')
     tmp_project.build()
     # Writing again will build again:
-    time.sleep(0.5)  # Sleep long enough to register a file change
+    time.sleep(1)  # Sleep long enough to register a file change
     tmp_project.write('src/f.cpp', r'bad again')
     with pytest.raises(CalledProcessError):
         tmp_project.build()

tests/test_compile_file.py

     # No error:
     tmp_project.compile_file('src/answer.cpp')
     # Fail:
-    time.sleep(0.5)
+    time.sleep(1)  # Sleep long enough to register a file change
     tmp_project.write('src/answer.cpp', 'int get_answer() { return "How many roads must a man walk down?"; }')
     with pytest.raises(subprocess.CalledProcessError):
         tmp_project.compile_file('src/answer.cpp')