Implement map tests for catching common errors. (#19204)

* Implement map tests for catching common errors.

- Adds test runner:
	- to make it easier to track things across test types
	- for example to ensure a fully specified log can be emitted

- Adds map tile test type:
	- when writing a test, coders implement CheckTile, which is
	  handed a single turf
	- when the test runner runs these tests, it iterates over
	  all turfs in the specified z-level, and runs each test's
	  CheckTile on each turf in turn.

- Adds two sample map tile tests:
	- check to see if a pipe exists on the same tile as a scrubber
	  or vent
	- check to see if a tile contains two cables, each with a center
	  node

* Review #1:

- Replace nested loops over map tiles with `block`
- Remove check for valid turf in individual tests, I think it's safe to
  assume `block` will always return legit turfs
- Added proper duration tracking for old tests
- Gave log file an appropriate extension
- Actually use `Fail` for tests

* whoops

* add more tests suggested by @Vi3trice

* Add some more tests courtesy @Bm0n and @Vi3trice

* windows are okay in space as long as it's nearspace

* Add failure threshold to prevent excessive logging.

Once this threshold is reached, a test will stop being processed for
every tile.

Note that this applies to `log_world` and `text2file` equally when
logging large amounts of failures.

* Document each test.

* Remove unnecessary reboot

* Let all map tests run to completion in CI matrix.

* I know what alphabetical means

code/modules/unit_tests/unit_test.dm

@@ -6,11 +6,6 @@ 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
 */
 
-/// VARS FOR UNIT TESTS
-GLOBAL_DATUM(current_test, /datum/unit_test)
-GLOBAL_VAR_INIT(failed_any_test, FALSE)
-GLOBAL_VAR(test_log)
-
 /datum/unit_test
 	//Bit of metadata for the future maybe
 	var/list/procs_tested
@@ -43,60 +38,3 @@ GLOBAL_VAR(test_log)
 		reason = "FORMATTED: [reason != null ? reason : "NULL"]"
 
 	LAZYADD(fail_reasons, reason)
-
-/proc/RunUnitTests()
-	CHECK_TICK
-
-	for(var/I in subtypesof(/datum/unit_test))
-		var/datum/unit_test/test = new I
-
-		GLOB.current_test = test
-		var/duration = REALTIMEOFDAY
-
-		test.Run()
-
-		duration = REALTIMEOFDAY - duration
-		GLOB.current_test = null
-		GLOB.failed_any_test |= !test.succeeded
-
-		var/list/log_entry = list("[test.succeeded ? "PASS" : "FAIL"]: [I] [duration / 10]s")
-		var/list/fail_reasons = test.fail_reasons
-
-		qdel(test)
-
-		for(var/J in 1 to LAZYLEN(fail_reasons))
-			log_entry += "\tREASON #[J]: [fail_reasons[J]]"
-		log_world(log_entry.Join("\n"))
-
-		CHECK_TICK
-
-	SSticker.reboot_helper("Unit Test Reboot", "tests ended", 0)
-
-
-// OTHER MISC PROCS RELATED TO UNIT TESTS //
-
-/world/proc/HandleTestRun()
-	//trigger things to run the whole process
-	Master.sleep_offline_after_initializations = FALSE
-	// This will have the ticker set the game up
-	// Running the tests is part of the ticker's start function, because I cant think of any better place to put it
-	SSticker.force_start = TRUE
-
-/world/proc/FinishTestRun()
-	set waitfor = FALSE
-	var/list/fail_reasons
-	if(GLOB)
-		if(GLOB.total_runtimes != 0)
-			fail_reasons = list("Total runtimes: [GLOB.total_runtimes]")
-		if(!GLOB.log_directory)
-			LAZYADD(fail_reasons, "Missing GLOB.log_directory!")
-		if(GLOB.failed_any_test)
-			LAZYADD(fail_reasons, "Unit Tests failed!")
-	else
-		fail_reasons = list("Missing GLOB!")
-	if(!fail_reasons)
-		text2file("Success!", "data/clean_run.lk")
-	else
-		log_world("Test run failed!\n[fail_reasons.Join("\n")]")
-	sleep(0)	//yes, 0, this'll let Reboot finish and prevent byond memes
-	del(src)	//shut it down