diff --git a/code/modules/unit_tests/_unit_tests.dm b/code/modules/unit_tests/_unit_tests.dm
index 223ea1b4bae..efbf15714a5 100644
--- a/code/modules/unit_tests/_unit_tests.dm
+++ b/code/modules/unit_tests/_unit_tests.dm
@@ -10,6 +10,10 @@
 /// Optionally allows an additional message in the case of a failure
 #define TEST_ASSERT_EQUAL(a, b, message) if ((a) != (b)) { return Fail("Expected [isnull(a) ? "null" : a] to be equal to [isnull(b) ? "null" : b].[message ? " [message]" : ""]") }
 
+/// Asserts that the two parameters passed are not equal, fails otherwise
+/// Optionally allows an additional message in the case of a failure
+#define TEST_ASSERT_NOTEQUAL(a, b, message) if ((a) == (b)) { return Fail("Expected [isnull(a) ? "null" : a] to not be equal to [isnull(b) ? "null" : b].[message ? " [message]" : ""]") }
+
 #include "anchored_mobs.dm"
 #include "bespoke_id.dm"
 #include "binary_insert.dm"
@@ -27,6 +31,7 @@
 #include "plantgrowth_tests.dm"
 #include "quick_swap_sanity.dm"
 #include "reagent_id_typos.dm"
+#include "reagent_mod_expose.dm"
 #include "reagent_mod_procs.dm"
 #include "reagent_recipe_collisions.dm"
 #include "resist.dm"
@@ -42,4 +47,5 @@
 
 #undef TEST_ASSERT
 #undef TEST_ASSERT_EQUAL
+#undef TEST_ASSERT_NOTEQUAL
 #endif
diff --git a/code/modules/unit_tests/reagent_mod_expose.dm b/code/modules/unit_tests/reagent_mod_expose.dm
new file mode 100644
index 00000000000..a19a9409975
--- /dev/null
+++ b/code/modules/unit_tests/reagent_mod_expose.dm
@@ -0,0 +1,50 @@
+// testing the mob expose procs are working
+
+/datum/reagent/method_patch_test
+	name = "method patch test"
+
+/datum/reagent/method_patch_test/expose_mob(mob/living/target, methods = PATCH, reac_volume, show_message = TRUE)
+	. = ..()
+	if(methods & PATCH)
+		target.health = 90
+	if(methods & INJECT)
+		target.health = 80
+
+/datum/unit_test/reagent_mob_expose/Run()
+	var/mob/living/carbon/human/human = allocate(/mob/living/carbon/human)
+	var/obj/item/reagent_containers/dropper/dropper = allocate(/obj/item/reagent_containers/dropper)
+	var/obj/item/reagent_containers/food/drinks/drink = allocate(/obj/item/reagent_containers/food/drinks/bottle)
+	var/obj/item/reagent_containers/pill/patch/patch = allocate(/obj/item/reagent_containers/pill/patch)
+	var/obj/item/reagent_containers/syringe/syringe = allocate(/obj/item/reagent_containers/syringe)
+
+	// INGEST
+	TEST_ASSERT_EQUAL(human.fire_stacks, 0, "Human has fire stacks before taking phlogiston")
+	drink.reagents.add_reagent(/datum/reagent/phlogiston, 10)
+	drink.attack(human, human)
+	TEST_ASSERT_EQUAL(human.fire_stacks, 1, "Human does not have fire stacks after taking phlogiston")
+
+	// TOUCH
+	dropper.reagents.add_reagent(/datum/reagent/water, 1)
+	dropper.afterattack(human, human, TRUE)
+	TEST_ASSERT_EQUAL(human.fire_stacks, 0, "Human still has fire stacks after touching water")
+
+	// VAPOR
+	TEST_ASSERT_EQUAL(human.drowsyness, 0, "Human is drowsy at the start of testing")
+	drink.reagents.clear_reagents()
+	drink.reagents.add_reagent(/datum/reagent/nitrous_oxide, 10)
+	drink.reagents.trans_to(human, 10, methods = VAPOR)
+	TEST_ASSERT_NOTEQUAL(human.drowsyness, 0, "Human is not drowsy after exposure to vapors")
+
+	// PATCH
+	human.health = 100
+	TEST_ASSERT_EQUAL(human.health, 100, "Human health did not set properly")
+	patch.reagents.add_reagent(/datum/reagent/method_patch_test, 1)
+	patch.self_delay = 0
+	patch.attack(human, human)
+	TEST_ASSERT_EQUAL(human.health, 90, "Human health did not update after patch was applied")
+
+	// INJECT
+	syringe.reagents.add_reagent(/datum/reagent/method_patch_test, 1)
+	syringe.mode = SYRINGE_INJECT
+	syringe.afterattack(human, human, TRUE)
+	TEST_ASSERT_EQUAL(human.health, 80, "Human health did not update after injection from syringe")