diff --git a/packages/backend/src/server/api/endpoints/notes/create.test.ts b/packages/backend/src/server/api/endpoints/notes/create.test.ts
index 6086f99c92..0aa05a2c93 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.test.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.test.ts
@@ -34,11 +34,10 @@ describe('api:notes/create', () => {
 					.toBe(VALID);
 			});
 
-			// TODO
-			//test('null post', () => {
-			//	expect(v({ text: null }))
-			//		.toBe(INVALID);
-			//});
+			test('null post', () => {
+				expect(v({ text: null }))
+					.toBe(INVALID);
+			});
 
 			test('0 characters post', () => {
 				expect(v({ text: '' }))
diff --git a/packages/backend/test/e2e/note.ts b/packages/backend/test/e2e/note.ts
index 9a0bf3385f..0f2e08e675 100644
--- a/packages/backend/test/e2e/note.ts
+++ b/packages/backend/test/e2e/note.ts
@@ -161,13 +161,6 @@ describe('Note', () => {
 		assert.strictEqual(deleteRes.status, 204);
 	});
 
-	test('text: nullのみだと怒られる', async () => {
-		const res = await api('/notes/create', {
-			text: null,
-		}, alice);
-		assert.strictEqual(res.status, 400);
-	});
-
 	test('文字数ぎりぎりで怒られない', async () => {
 		const post = {
 			text: '!'.repeat(MAX_NOTE_TEXT_LENGTH), // 3000文字