Create interaction test harness.

code/tests/_game_test.dm

@@ -94,3 +94,67 @@
 		instance = new type()
 	LAZYADD(allocated, instance)
 	return instance
+
+/datum/game_test/proc/puppeteer(carbon_type = /mob/living/carbon/human, turf/initial_location)
+	TEST_ASSERT(ispath(carbon_type, /mob/living/carbon/human), "unexpected puppeteer carbon type [carbon_type]")
+	var/datum/test_puppeteer/puppeteer = new
+
+	if(!initial_location)
+		initial_location = locate(179, 136, 1) // Center of admin testing area
+	puppeteer.origin_test = src
+	puppeteer.puppet = allocate(carbon_type, initial_location)
+	var/datum/mind/new_mind = new("interaction_test_[puppeteer.puppet.UID()]")
+	new_mind.transfer_to(puppeteer.puppet)
+
+	return puppeteer
+
+/datum/test_puppeteer
+	var/mob/living/carbon/puppet
+	var/datum/game_test/origin_test
+
+/datum/test_puppeteer/proc/spawn_puppet_nearby(carbon_type = /mob/living/carbon/human)
+	for(var/turf/T in RANGE_TURFS(1, puppet.loc))
+		if(!is_blocked_turf(T, exclude_mobs = FALSE))
+			return origin_test.puppeteer(carbon_type, T)
+
+	origin_test.Fail("could not spawn puppeteer near [src]")
+
+/datum/test_puppeteer/proc/spawn_obj_in_hand(obj_type)
+	var/obj/new_obj = origin_test.allocate(obj_type, null)
+	if(puppet.put_in_hands(new_obj))
+		return new_obj
+
+	origin_test.Fail("could not spawn obj [obj_type] in hand of [puppet]")
+
+/datum/test_puppeteer/proc/spawn_obj_nearby(obj_type)
+	for(var/turf/T in RANGE_TURFS(1, puppet.loc))
+		if(!is_blocked_turf(T, exclude_mobs = FALSE))
+			return origin_test.allocate(obj_type, T)
+
+	origin_test.Fail("could not spawn obj [obj_type] near [src]")
+
+/datum/test_puppeteer/proc/click_on(target, params)
+	var/datum/test_puppeteer/puppet_target = target
+	sleep(max(puppet.next_click, puppet.next_move) - world.time + 1)
+	if(istype(puppet_target))
+		puppet.ClickOn(puppet_target.puppet, params)
+		return
+
+	puppet.ClickOn(target, params)
+
+/datum/test_puppeteer/proc/spawn_mob_nearby(mob_type)
+	for(var/turf/T in RANGE_TURFS(1, puppet))
+		if(!is_blocked_turf(T, exclude_mobs = FALSE))
+			var/mob/new_mob = origin_test.allocate(mob_type, T)
+			return new_mob
+
+/datum/test_puppeteer/proc/check_attack_log(snippet)
+	for(var/log_text in puppet.attack_log_old)
+		if(findtextEx(log_text, snippet))
+			return TRUE
+
+/datum/test_puppeteer/proc/set_intent(new_intent)
+	puppet.a_intent_change(new_intent)
+
+/datum/test_puppeteer/proc/rejuvenate()
+	puppet.rejuvenate()

code/tests/attack_chain/test_attack_chain_cult_dagger.dm

@@ -0,0 +1,17 @@
+/datum/game_test/attack_chain_cult_dagger/Run()
+	var/datum/test_puppeteer/cultist = puppeteer()
+	var/datum/test_puppeteer/target = cultist.spawn_puppet_nearby()
+
+	cultist.puppet.mind.add_antag_datum(/datum/antagonist/cultist)
+	cultist.spawn_obj_in_hand(/obj/item/melee/cultblade/dagger)
+	cultist.set_intent("harm")
+	cultist.click_on(target)
+
+	TEST_ASSERT(target.check_attack_log("Attacked with ritual dagger"), "non-cultist missing dagger attack log")
+	TEST_ASSERT_NOTEQUAL(target.puppet.health, target.puppet.getMaxHealth(), "cultist attacking non-cultist with dagger caused no damage")
+
+	target.rejuvenate()
+	target.puppet.mind.add_antag_datum(/datum/antagonist/cultist)
+
+	cultist.click_on(target)
+	TEST_ASSERT_EQUAL(target.puppet.health, target.puppet.getMaxHealth(), "cultist attacking cultist with dagger caused damage")

code/tests/attack_chain/test_attack_chain_vehicles.dm

@@ -0,0 +1,26 @@
+/datum/game_test/attack_chain_vehicles/Run()
+	var/datum/test_puppeteer/player = puppeteer()
+	var/obj/item/key/janitor/janicart_key = player.spawn_obj_in_hand(/obj/item/key/janitor)
+	var/obj/vehicle/janicart/janicart = player.spawn_obj_nearby(/obj/vehicle/janicart)
+
+	player.click_on(janicart)
+	TEST_ASSERT_EQUAL(janicart.inserted_key, janicart_key, "did not find janicart key in vehicle")
+
+	var/move_delay = janicart.vehicle_move_delay
+	player.spawn_obj_in_hand(/obj/item/borg/upgrade/vtec)
+	player.click_on(janicart)
+	TEST_ASSERT(janicart.vehicle_move_delay < move_delay, "VTEC upgrade not applied properly")
+
+	TEST_ASSERT_NULL(janicart.mybag, "unexpected trash bag on janicart")
+	var/obj/item/storage/bag/trash/bag = player.spawn_obj_in_hand(/obj/item/storage/bag/trash)
+	player.click_on(janicart)
+	TEST_ASSERT_EQUAL(janicart.mybag, bag, "trash bag not attached to janicart")
+
+	var/obj/item/kitchen/knife/knife = player.spawn_obj_in_hand(/obj/item/kitchen/knife)
+	player.set_intent("harm")
+	player.click_on(janicart)
+	TEST_ASSERT(janicart.obj_integrity < janicart.max_integrity, "knife attack not performed")
+
+	player.set_intent("help")
+	player.click_on(janicart)
+	TEST_ASSERT(knife in bag, "knife not placed in trash bag")

code/tests/game_tests.dm

@@ -4,6 +4,8 @@
 #ifdef GAME_TESTS
 #include "_game_test.dm"
 #include "atmos\test_ventcrawl.dm"
+#include "attack_chain\test_attack_chain_cult_dagger.dm"
+#include "attack_chain\test_attack_chain_vehicles.dm"
 #include "games\test_cards.dm"
 #include "jobs\test_job_globals.dm"
 #include "test_aicard_icons.dm"

code/tests/test_runner.dm

@@ -70,7 +70,15 @@
 
 		if(!test.succeeded)
 			failed_any_test = TRUE
-			test_logs[I] += test.fail_reasons
+			for(var/fail_reason in test.fail_reasons)
+				if(islist(fail_reason))
+					var/text = fail_reason[1]
+					var/file = fail_reason[2]
+					var/line = fail_reason[3]
+
+					test_logs[I] += "[file]:[line]: [text]"
+				else
+					test_logs[I] += fail_reason
 
 		qdel(test)