diff --git a/test/sim/abilities/illusion.js b/test/sim/abilities/illusion.js
index 94fdd8e59b..a402c3983d 100644
--- a/test/sim/abilities/illusion.js
+++ b/test/sim/abilities/illusion.js
@@ -57,19 +57,6 @@ describe('Illusion', function () {
 		assert(battle.log.every(line => !line.includes('Gmax')));
 	});
 
-	it.skip(`should instantly wear off when Neutralizing Gas enters the field`, function () {
-		battle = common.createBattle([[
-			{species: "Zoroark", ability: 'illusion', moves: ['sleeptalk']},
-			{species: "Eternatus", moves: ['sleeptalk']},
-		], [
-			{species: "Wynaut", moves: ['sleeptalk']},
-			{species: "Weezing", ability: 'neutralizinggas', moves: ['sleeptalk']},
-		]]);
-
-		battle.makeChoices('auto', 'switch 2');
-		assert(battle.log.some(line => line.includes('|-end|p1a: Zoroark|Illusion')));
-	});
-
 	it(`should instantly wear off before using a Z-move`, function () {
 		battle = common.gen(7).createBattle([[
 			{species: "Zoroark", ability: 'illusion', item: 'fightiniumz', moves: ['machpunch', 'sleeptalk']},
diff --git a/test/sim/abilities/imposter.js b/test/sim/abilities/imposter.js
index 0e8e769caf..0744ee8086 100644
--- a/test/sim/abilities/imposter.js
+++ b/test/sim/abilities/imposter.js
@@ -43,19 +43,4 @@ describe('Imposter', function () {
 		battle.makeChoices('move skillswap', 'switch greninja');
 		assert.notEqual(battle.p1.active[0].species, battle.p2.active[0].species);
 	});
-
-	it('should not activate if Neutralizing Gas leaves the field', function () {
-		battle = common.createBattle();
-		battle.setPlayer('p1', {team: [
-			{species: "Weezing", ability: 'neutralizinggas', moves: ['snore']},
-			{species: "Greninja", ability: 'torrent', moves: ['teleport']},
-		]});
-		battle.setPlayer('p2', {team: [
-			{species: "Ditto", ability: 'imposter', moves: ['sleeptalk']},
-		]});
-		assert.notEqual(battle.p1.active[0].species, battle.p2.active[0].species);
-		battle.makeChoices('switch greninja', 'move sleeptalk');
-		assert.notEqual(battle.p1.active[0].species, battle.p2.active[0].species);
-		assert.notEqual(battle.p1.pokemon[1].species, battle.p2.active[0].species);
-	});
 });
diff --git a/test/sim/abilities/neutralizinggas.js b/test/sim/abilities/neutralizinggas.js
index 3f6223a52a..ab6fe68e01 100644
--- a/test/sim/abilities/neutralizinggas.js
+++ b/test/sim/abilities/neutralizinggas.js
@@ -82,6 +82,114 @@ describe('Neutralizing Gas', function () {
 		assert.fullHP(battle.p1.active[0]);
 	});
 
+	it('should not activate if Neutralizing Gas leaves the field', function () {
+		battle = common.createBattle();
+		battle.setPlayer('p1', {team: [
+			{species: "Weezing", ability: 'neutralizinggas', moves: ['snore']},
+			{species: "Greninja", ability: 'torrent', moves: ['teleport']},
+		]});
+		battle.setPlayer('p2', {team: [
+			{species: "Ditto", ability: 'imposter', moves: ['sleeptalk']},
+		]});
+		assert.notEqual(battle.p1.active[0].species, battle.p2.active[0].species);
+		battle.makeChoices('switch greninja', 'move sleeptalk');
+		assert.notEqual(battle.p1.active[0].species, battle.p2.active[0].species);
+		assert.notEqual(battle.p1.pokemon[1].species, battle.p2.active[0].species);
+	});
+
+	it(`should prevent Unburden's activation when it is active on the field`, function () {
+		battle = common.createBattle([[
+			{species: "Wynaut", ability: 'unburden', item: 'sitrusberry', evs: {hp: 4}, moves: ['bellydrum']},
+		], [
+			{species: "Pancham", ability: 'neutralizinggas', moves: ['sleeptalk']},
+			{species: "Whismur", moves: ['sleeptalk']},
+		]]);
+
+		const wynaut = battle.p1.active[0];
+		const originalSpeed = wynaut.getStat('spe');
+		battle.makeChoices();
+		assert.equal(wynaut.getStat('spe'), originalSpeed);
+
+		//The chance to trigger Unburden is gone, so it missed the timing and doesn't gain the speed post-NGas removal
+		battle.makeChoices('auto', 'switch 2');
+		assert.equal(wynaut.getStat('spe'), originalSpeed);
+	});
+
+	it.skip(`should negate Unburden when Neutralizing Gas enters the field`, function () {
+		battle = common.createBattle([[
+			{species: "Wynaut", ability: 'unburden', item: 'sitrusberry', evs: {hp: 4}, moves: ['bellydrum']},
+		], [
+			{species: "Whismur", moves: ['sleeptalk']},
+			{species: "Pancham", ability: 'neutralizinggas', moves: ['sleeptalk']},
+		]]);
+
+		const wynaut = battle.p1.active[0];
+		const originalSpeed = wynaut.getStat('spe');
+		battle.makeChoices();
+		assert.equal(wynaut.getStat('spe'), originalSpeed * 2);
+
+		battle.makeChoices('auto', 'switch 2');
+		assert.equal(wynaut.getStat('spe'), originalSpeed);
+
+		battle.makeChoices('auto', 'switch 2');
+		assert.equal(wynaut.getStat('spe'), originalSpeed * 2);
+	});
+
+	it.skip(`should cause Illusion to instantly wear off when Neutralizing Gas enters the field`, function () {
+		battle = common.createBattle([[
+			{species: "Zoroark", ability: 'illusion', moves: ['sleeptalk']},
+			{species: "Eternatus", moves: ['sleeptalk']},
+		], [
+			{species: "Wynaut", moves: ['sleeptalk']},
+			{species: "Weezing", ability: 'neutralizinggas', moves: ['sleeptalk']},
+		]]);
+
+		battle.makeChoices('auto', 'switch 2');
+		assert(battle.log.some(line => line.includes('|-end|p1a: Zoroark|Illusion')));
+	});
+
+	it.skip(`should cause Slow Start to instantly wear off/restart when Neutralizing Gas leaves/enters the field`, function () {
+		battle = common.createBattle([[
+			{species: "Regigigas", ability: 'slowstart', moves: ['sleeptalk']},
+			{species: "Eternatus", moves: ['sleeptalk']},
+		], [
+			{species: "Wynaut", moves: ['sleeptalk']},
+			{species: "Weezing", ability: 'neutralizinggas', moves: ['sleeptalk']},
+		]]);
+
+		const regigigas = battle.p1.active[0];
+		const slowStartSpeed = regigigas.getStat('spe');
+
+		//Slow Start should be negated, so it should have its original, non-Slow Start speed
+		battle.makeChoices('auto', 'switch 2');
+		assert.equal(regigigas.getStat('spe'), slowStartSpeed * 2);
+
+		//Slow Start should be turned back on, so it should have its Slow Start speed again
+		battle.makeChoices('auto', 'switch 2');
+		assert.equal(regigigas.getStat('spe'), slowStartSpeed);
+	});
+
+	it.skip(`should not cause Gluttony to instantly eat Berries when Neutralizing Gas leaves the field`, function () {
+		battle = common.createBattle([[
+			{species: "Wynaut", ability: 'gluttony', item: 'aguavberry', evs: {hp: 4}, moves: ['bellydrum']},
+		], [
+			{species: "Pancham", ability: 'neutralizinggas', moves: ['sleeptalk']},
+			{species: "Whismur", level: 1, moves: ['seismictoss']},
+		]]);
+
+		const wynaut = battle.p1.active[0];
+		battle.makeChoices();
+		assert.equal(wynaut.hp, Math.floor(wynaut.maxhp / 2));
+
+		// Gluttony doesn't activate because it missed the timing
+		battle.makeChoices('auto', 'switch 2');
+		assert.equal(wynaut.hp, Math.floor(wynaut.maxhp / 2));
+
+		// Gluttony now has the opportunity to activate the Aguav Berry again on taking damage
+		battle.makeChoices();
+		assert.equal(wynaut.hp, Math.floor(wynaut.maxhp / 2) - 1 + Math.floor(wynaut.maxhp * 0.33));
+	});
+
 	it.skip(`should not trigger twice if negated then replaced`, function () {
 		battle = common.createBattle([[
 			{species: "Weezing", ability: 'neutralizinggas', moves: ['sleeptalk']},
diff --git a/test/sim/abilities/unburden.js b/test/sim/abilities/unburden.js
index 1119d1165e..4254cc3dba 100644
--- a/test/sim/abilities/unburden.js
+++ b/test/sim/abilities/unburden.js
@@ -68,42 +68,4 @@ describe('Unburden', function () {
 		battle.makeChoices('move machpunch', 'move bestow');
 		assert.equal(battle.p1.active[0].getStat('spe'), originalSpeed);
 	});
-
-	it(`should not trigger when Neutralizing Gas is active on the field`, function () {
-		battle = common.createBattle([[
-			{species: "Wynaut", ability: 'unburden', item: 'sitrusberry', evs: {hp: 4}, moves: ['bellydrum']},
-		], [
-			{species: "Pancham", ability: 'neutralizinggas', moves: ['sleeptalk']},
-			{species: "Whismur", moves: ['sleeptalk']},
-		]]);
-
-		const wynaut = battle.p1.active[0];
-		const originalSpeed = wynaut.getStat('spe');
-		battle.makeChoices();
-		assert.equal(wynaut.getStat('spe'), originalSpeed);
-
-		//The chance to trigger Unburden is gone, so it missed the timing and doesn't gain the speed post-NGas removal
-		battle.makeChoices('auto', 'switch 2');
-		assert.equal(wynaut.getStat('spe'), originalSpeed);
-	});
-
-	it.skip(`should be negated while Neutralizing Gas is active on the field`, function () {
-		battle = common.createBattle([[
-			{species: "Wynaut", ability: 'unburden', item: 'sitrusberry', evs: {hp: 4}, moves: ['bellydrum']},
-		], [
-			{species: "Whismur", moves: ['sleeptalk']},
-			{species: "Pancham", ability: 'neutralizinggas', moves: ['sleeptalk']},
-		]]);
-
-		const wynaut = battle.p1.active[0];
-		const originalSpeed = wynaut.getStat('spe');
-		battle.makeChoices();
-		assert.equal(wynaut.getStat('spe'), originalSpeed * 2);
-
-		battle.makeChoices('auto', 'switch 2');
-		assert.equal(wynaut.getStat('spe'), originalSpeed);
-
-		battle.makeChoices('auto', 'switch 2');
-		assert.equal(wynaut.getStat('spe'), originalSpeed * 2);
-	});
 });