diff --git a/test/battle/ability/toxic_chain.c b/test/battle/ability/toxic_chain.c
new file mode 100644
index 0000000000..bcbdae082f
--- /dev/null
+++ b/test/battle/ability/toxic_chain.c
@@ -0,0 +1,76 @@
+#include "global.h"
+#include "test/battle.h"
+
+SINGLE_BATTLE_TEST("Toxic Chain inflicts bad poison when attacking")
+{
+    GIVEN {
+        ASSUME(gMovesInfo[MOVE_TACKLE].category != DAMAGE_CATEGORY_STATUS);
+        PLAYER(SPECIES_OKIDOGI) { Ability(ABILITY_TOXIC_CHAIN); }
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(player, MOVE_TACKLE); }
+    } SCENE {
+        ABILITY_POPUP(player, ABILITY_TOXIC_CHAIN);
+        ANIMATION(ANIM_TYPE_STATUS, B_ANIM_STATUS_PSN, opponent);
+        MESSAGE("Foe Wobbuffet is badly poisoned!");
+        STATUS_ICON(opponent, badPoison: TRUE);
+    } THEN {
+        EXPECT(opponent->status1 & STATUS1_TOXIC_POISON);
+    }
+}
+
+SINGLE_BATTLE_TEST("Toxic Chain inflicts bad poison on any hit of a multi-hit move")
+{
+    GIVEN {
+        ASSUME(gMovesInfo[MOVE_DOUBLE_SLAP].category != DAMAGE_CATEGORY_STATUS);
+        ASSUME(gMovesInfo[MOVE_DOUBLE_SLAP].effect == EFFECT_MULTI_HIT);
+        ASSUME(gItemsInfo[ITEM_PECHA_BERRY].holdEffect == HOLD_EFFECT_CURE_PSN);
+        PLAYER(SPECIES_OKIDOGI) { Ability(ABILITY_TOXIC_CHAIN); }
+        OPPONENT(SPECIES_WOBBUFFET) { Item(ITEM_PECHA_BERRY); }
+    } WHEN {
+        TURN { MOVE(player, MOVE_DOUBLE_SLAP); }
+    } SCENE {
+        ABILITY_POPUP(player, ABILITY_TOXIC_CHAIN);
+        ANIMATION(ANIM_TYPE_STATUS, B_ANIM_STATUS_PSN, opponent);
+        MESSAGE("Foe Wobbuffet is badly poisoned!");
+        STATUS_ICON(opponent, badPoison: TRUE);
+        ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_HELD_ITEM_EFFECT, opponent);
+        STATUS_ICON(opponent, badPoison: FALSE);
+        ABILITY_POPUP(player, ABILITY_TOXIC_CHAIN);
+        ANIMATION(ANIM_TYPE_STATUS, B_ANIM_STATUS_PSN, opponent);
+        MESSAGE("Foe Wobbuffet is badly poisoned!");
+        STATUS_ICON(opponent, badPoison: TRUE);
+    } THEN {
+        EXPECT(opponent->status1 & STATUS1_TOXIC_POISON);
+    }
+}
+
+DOUBLE_BATTLE_TEST("Toxic Chain can inflict bad poison on both foes")
+{
+    GIVEN {
+        ASSUME(gMovesInfo[MOVE_BLIZZARD].category != DAMAGE_CATEGORY_STATUS);
+        ASSUME(gMovesInfo[MOVE_BLIZZARD].target == MOVE_TARGET_BOTH);
+        PLAYER(SPECIES_OKIDOGI) { Ability(ABILITY_TOXIC_CHAIN); }
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WYNAUT);
+    } WHEN {
+        TURN { MOVE(playerLeft, MOVE_BLIZZARD); }
+    } SCENE {
+        HP_BAR(opponentLeft);
+        ABILITY_POPUP(playerLeft, ABILITY_TOXIC_CHAIN);
+        ANIMATION(ANIM_TYPE_STATUS, B_ANIM_STATUS_PSN, opponentLeft);
+        MESSAGE("Foe Wobbuffet is badly poisoned!");
+        STATUS_ICON(opponentLeft, badPoison: TRUE);
+        HP_BAR(opponentRight);
+        ABILITY_POPUP(playerLeft, ABILITY_TOXIC_CHAIN);
+        ANIMATION(ANIM_TYPE_STATUS, B_ANIM_STATUS_PSN, opponentRight);
+        MESSAGE("Foe Wynaut is badly poisoned!");
+        STATUS_ICON(opponentRight, badPoison: TRUE);
+    } THEN {
+        EXPECT(opponentLeft->status1 & STATUS1_TOXIC_POISON);
+        EXPECT(opponentRight->status1 & STATUS1_TOXIC_POISON);
+    }
+}
+
+TO_DO_BATTLE_TEST("Toxic Chain makes Lum/Pecha Berry trigger before being knocked off");