Add test helpers to test .dmes

- Make long_running_test_copy.dme just include the original

tests/DMAPI/BasicOperation/Test.dm

@@ -1,4 +1,4 @@
-/world/New()
+/world/proc/RunTest()
 	text2file("SUCCESS", "test_success.txt")
 	log << "About to call TgsNew()"
 	sleep_offline = FALSE
@@ -6,10 +6,6 @@
 	log << "About to call StartAsync()"
 	StartAsync()
 
-/world/Error(exception)
-	fdel("test_success.txt")
-	text2file("Runtime Error: [exception]", "test_fail_reason.txt")
-
 /proc/StartAsync()
 	set waitfor = FALSE
 	Run()
@@ -21,7 +17,7 @@
 
 	var/list/world_params = world.params
 	if(!("test" in world_params) || world_params["test"] != "bababooey")
-		text2file("Expected parameter test=bababooey but did not receive", "test_fail_reason.txt")
+		FailTest("Expected parameter test=bababooey but did not receive", "test_fail_reason.txt")
 
 	world.log << "sleep2"
 	sleep(150)

tests/DMAPI/BasicOperation/basic_operation_test.dme

@@ -12,6 +12,6 @@
 
 // BEGIN_INCLUDE
 #include "Config.dm"
-#include "..\tgs_include.dm"
+#include "../test_prelude.dm"
 #include "Test.dm"
 // END_INCLUDE