/usr/include/mirtest/mir/ is in mirtest-dev 0.26.3+16.04.20170605-0ubuntu1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mirtest/mir/test/
/usr/include/mirtest/mir/test/auto_unblock_thread.h
/usr/include/mirtest/mir/test/cross_process_action.h
/usr/include/mirtest/mir/test/cross_process_sync.h
/usr/include/mirtest/mir/test/death.h
/usr/include/mirtest/mir/test/display_config_matchers.h
/usr/include/mirtest/mir/test/doubles/
/usr/include/mirtest/mir/test/doubles/fake_display.h
/usr/include/mirtest/mir/test/doubles/mock_display_configuration.h
/usr/include/mirtest/mir/test/doubles/mock_egl.h
/usr/include/mirtest/mir/test/doubles/mock_input_device_hub.h
/usr/include/mirtest/mir/test/doubles/mock_input_device_observer.h
/usr/include/mirtest/mir/test/doubles/mock_input_dispatcher.h
/usr/include/mirtest/mir/test/doubles/mock_prompt_session_listener.h
/usr/include/mirtest/mir/test/doubles/mock_seat_report.h
/usr/include/mirtest/mir/test/doubles/mock_window_manager.h
/usr/include/mirtest/mir/test/doubles/nested_mock_egl.h
/usr/include/mirtest/mir/test/doubles/null_display.h
/usr/include/mirtest/mir/test/doubles/null_display_buffer.h
/usr/include/mirtest/mir/test/doubles/null_display_buffer_compositor_factory.h
/usr/include/mirtest/mir/test/doubles/null_display_configuration.h
/usr/include/mirtest/mir/test/doubles/null_display_sync_group.h
/usr/include/mirtest/mir/test/doubles/null_gl_context.h
/usr/include/mirtest/mir/test/doubles/null_logger.h
/usr/include/mirtest/mir/test/doubles/null_platform.h
/usr/include/mirtest/mir/test/doubles/null_platform_ipc_operations.h
/usr/include/mirtest/mir/test/doubles/stub_cursor.h
/usr/include/mirtest/mir/test/doubles/stub_cursor_image.h
/usr/include/mirtest/mir/test/doubles/stub_display_buffer.h
/usr/include/mirtest/mir/test/doubles/stub_display_configuration.h
/usr/include/mirtest/mir/test/doubles/stub_input_device.h
/usr/include/mirtest/mir/test/doubles/stub_session.h
/usr/include/mirtest/mir/test/doubles/stub_session_authorizer.h
/usr/include/mirtest/mir/test/doubles/stub_surface.h
/usr/include/mirtest/mir/test/doubles/wrap_shell_to_track_latest_surface.h
/usr/include/mirtest/mir/test/empty_deleter.h
/usr/include/mirtest/mir/test/event_factory.h
/usr/include/mirtest/mir/test/event_matchers.h
/usr/include/mirtest/mir/test/fake_shared.h
/usr/include/mirtest/mir/test/pipe.h
/usr/include/mirtest/mir/test/popen.h
/usr/include/mirtest/mir/test/signal.h
/usr/include/mirtest/mir/test/spin_wait.h
/usr/include/mirtest/mir/test/validity_matchers.h
/usr/include/mirtest/mir_test_framework/any_surface.h
/usr/include/mirtest/mir_test_framework/async_server_runner.h
/usr/include/mirtest/mir_test_framework/connected_client_headless_server.h
/usr/include/mirtest/mir_test_framework/connected_client_with_a_surface.h
/usr/include/mirtest/mir_test_framework/declarative_placement_window_manage_policy.h
/usr/include/mirtest/mir_test_framework/detect_server.h
/usr/include/mirtest/mir_test_framework/executable_path.h
/usr/include/mirtest/mir_test_framework/fake_input_device.h
/usr/include/mirtest/mir_test_framework/headless_display_buffer_compositor_factory.h
/usr/include/mirtest/mir_test_framework/headless_in_process_server.h
/usr/include/mirtest/mir_test_framework/headless_nested_server_runner.h
/usr/include/mirtest/mir_test_framework/headless_test.h
/usr/include/mirtest/mir_test_framework/in_process_server.h
/usr/include/mirtest/mir_test_framework/interprocess_client_server_test.h
/usr/include/mirtest/mir_test_framework/main.h
/usr/include/mirtest/mir_test_framework/observant_shell.h
/usr/include/mirtest/mir_test_framework/placement_applying_shell.h
/usr/include/mirtest/mir_test_framework/process.h
/usr/include/mirtest/mir_test_framework/server_runner.h
/usr/include/mirtest/mir_test_framework/stub_client_platform_options.h
/usr/include/mirtest/mir_test_framework/stub_graphics_platform_operation.h
/usr/include/mirtest/mir_test_framework/stub_platform_extension.h
/usr/include/mirtest/mir_test_framework/stub_platform_helpers.h
/usr/include/mirtest/mir_test_framework/stub_server_platform_factory.h
/usr/include/mirtest/mir_test_framework/temporary_environment_value.h
/usr/include/mirtest/mir_test_framework/visible_surface.h