diff --git a/packages/backend/test/e2e/endpoints.ts b/packages/backend/test/e2e/endpoints.ts
index de5e8ba95e..d3861051b5 100644
--- a/packages/backend/test/e2e/endpoints.ts
+++ b/packages/backend/test/e2e/endpoints.ts
@@ -117,12 +117,20 @@ describe('Endpoints', () => {
 			assert.strictEqual(res.body.birthday, myBirthday);
 		});
 
-		test('名前を空白にできる', async () => {
+		test('名前を空白のみにした場合nullになる', async () => {
 			const res = await api('i/update', {
 				name: ' ',
 			}, alice);
 			assert.strictEqual(res.status, 200);
-			assert.strictEqual(res.body.name, ' ');
+			assert.strictEqual(res.body.name, null);
+		});
+
+		test('名前の前後に空白を入れてもトリムされる', async () => {
+			const res = await api('i/update', {
+				name: ' あ い う  ',
+			}, alice);
+			assert.strictEqual(res.status, 200);
+			assert.strictEqual(res.body.name, 'あ い う');
 		});
 
 		test('誕生日の設定を削除できる', async () => {
diff --git a/packages/backend/test/e2e/users.ts b/packages/backend/test/e2e/users.ts
index 5fb9642367..3458e06384 100644
--- a/packages/backend/test/e2e/users.ts
+++ b/packages/backend/test/e2e/users.ts
@@ -409,9 +409,6 @@ describe('ユーザー', () => {
 		{ parameters: () => ({ name: 'x'.repeat(50) }) },
 		{ parameters: () => ({ name: 'x' }) },
 		{ parameters: () => ({ name: 'My name' }) },
-		{ parameters: () => ({ name: '' }), expect: { name: null } },
-		{ parameters: () => ({ name: '   name  with spaces   ' }), expect: { name: 'name  with spaces' } },
-		{ parameters: () => ({ name: '         ' }), expect: { name: null } },
 		{ parameters: () => ({ description: null }) },
 		{ parameters: () => ({ description: 'x'.repeat(1500) }) },
 		{ parameters: () => ({ description: 'x' }) },
@@ -468,9 +465,9 @@ describe('ユーザー', () => {
 		{ parameters: () => ({ notificationRecieveConfig: {} }) },
 		{ parameters: () => ({ emailNotificationTypes: ['mention', 'reply', 'quote', 'follow', 'receiveFollowRequest'] }) },
 		{ parameters: () => ({ emailNotificationTypes: [] }) },
-	] as const)('を書き換えることができる($#)', async ({ parameters, expect }) => {
+	] as const)('を書き換えることができる($#)', async ({ parameters }) => {
 		const response = await successfulApiCall({ endpoint: 'i/update', parameters: parameters(), user: alice });
-		const expected = { ...meDetailed(alice, true), ...parameters(), ...expect };
+		const expected = { ...meDetailed(alice, true), ...parameters() };
 		assert.deepStrictEqual(response, expected, inspect(parameters()));
 	});