code quality

code/modules/unit_tests/unit_test.dm

@@ -1,9 +1,14 @@
 /*
+
 Usage:
 Override /Run() to run your test code
+
 Call Fail() to fail the test (You should specify a reason)
+
 You may use /New() and /Destroy() for setup/teardown respectively
+
 You can use the run_loc_bottom_left and run_loc_top_right to get turfs for testing
+
 */
 
 GLOBAL_DATUM(current_test, /datum/unit_test)
@@ -14,19 +19,33 @@ GLOBAL_VAR(test_log)
 	//Bit of metadata for the future maybe
 	var/list/procs_tested
 
-	//usable vars
+	/// The bottom left turf of the testing zone
 	var/turf/run_loc_bottom_left
+
+	/// The top right turf of the testing zone
 	var/turf/run_loc_top_right
 
+	/// The type of turf to allocate for the testing zone
+	var/test_turf_type = /turf/open/floor/plasteel
+
 	//internal shit
+	var/focus = FALSE
 	var/succeeded = TRUE
 	var/list/allocated
 	var/list/fail_reasons
 
+	var/static/datum/turf_reservation/turf_reservation
+
 /datum/unit_test/New()
+	if (isnull(turf_reservation))
+		turf_reservation = SSmapping.RequestBlockReservation(5, 5)
+
+	for (var/turf/reserved_turf in turf_reservation.reserved_turfs)
+		reserved_turf.ChangeTurf(test_turf_type)
+
 	allocated = new
-	run_loc_bottom_left = locate(1, 1, 1)
-	run_loc_top_right = locate(5, 5, 1)
+	run_loc_bottom_left = locate(turf_reservation.bottom_left_coords[1], turf_reservation.bottom_left_coords[2], turf_reservation.bottom_left_coords[3])
+	run_loc_top_right = locate(turf_reservation.top_right_coords[1], turf_reservation.top_right_coords[2], turf_reservation.top_right_coords[3])
 
 /datum/unit_test/Destroy()
 	//clear the test area
@@ -61,7 +80,14 @@ GLOBAL_VAR(test_log)
 /proc/RunUnitTests()
 	CHECK_TICK
 
-	for(var/I in subtypesof(/datum/unit_test))
+	var/tests_to_run = subtypesof(/datum/unit_test)
+	for (var/_test_to_run in tests_to_run)
+		var/datum/unit_test/test_to_run = _test_to_run
+		if (initial(test_to_run.focus))
+			tests_to_run = list(test_to_run)
+			break
+
+	for(var/I in tests_to_run)
 		var/datum/unit_test/test = new I
 
 		GLOB.current_test = test