diff --git a/src/services/note/reaction/create.ts b/src/services/note/reaction/create.ts
index b54f8a60bb..8fa0b52e7d 100644
--- a/src/services/note/reaction/create.ts
+++ b/src/services/note/reaction/create.ts
@@ -26,7 +26,7 @@ export default async (user: IUser, note: INote, reaction: string) => new Promise
 	} catch (e) {
 		// duplicate key error
 		if (e.code === 11000) {
-			return res(null);
+			return rej('already reacted');
 		}
 
 		console.error(e);
diff --git a/test/api.ts b/test/api.ts
index a978394129..1e51e6dff4 100644
--- a/test/api.ts
+++ b/test/api.ts
@@ -3,6 +3,7 @@
  */
 
 import * as http from 'http';
+import * as fs from 'fs';
 import * as assert from 'chai';
 
 assert.use(require('chai-http'));
@@ -44,7 +45,7 @@ const request = async (endpoint: string, params: any, me?: any): Promise<ChaiHtt
 	return res;
 };
 
-const signup = async (params?: any) => {
+const signup = async (params?: any): Promise<any> => {
 	const q = Object.assign({
 		username: 'test',
 		password: 'test'
@@ -54,6 +55,32 @@ const signup = async (params?: any) => {
 
 	return res.body;
 };
+
+const post = async (user: any, params?: any): Promise<any> => {
+	const q = Object.assign({
+		text: 'test'
+	}, params);
+
+	const res = await request('/notes/create', q, user);
+
+	return res.body.createdNote;
+};
+
+const react = async (user: any, note: any, reaction: string): Promise<any> => {
+	await request('/notes/reactions/create', {
+		noteId: note.id,
+		reaction: reaction
+	}, user);
+};
+
+const uploadFile = async (user: any): Promise<any> => {
+	const res = await assert.request(server)
+		.post('/drive/files/create')
+		.field('i', user.token)
+		.attach('file', fs.readFileSync(__dirname + '/resources/Lenna.png'), 'Lenna.png');
+
+	return res.body;
+};
 //#endregion
 
 describe('API', () => {
@@ -226,4 +253,319 @@ describe('API', () => {
 			expect(res).have.status(400);
 		}));
 	});
+
+	describe('notes/create', () => {
+		it('投稿できる', async(async () => {
+			const me = await signup();
+			const post = {
+				text: 'test'
+			};
+			const res = await request('/notes/create', post, me);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('text').eql(post.text);
+		}));
+
+		it('ファイルを添付できる', async(async () => {
+			const me = await signup();
+			const file = await uploadFile(me);
+			const res = await request('/notes/create', {
+				fileIds: [file.id]
+			}, me);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('fileIds').eql([file.id]);
+		}));
+
+		it('他人のファイルは無視', async(async () => {
+			const me = await signup({ username: 'alice' });
+			const bob = await signup({ username: 'bob' });
+			const file = await uploadFile(bob);
+			const res = await request('/notes/create', {
+				fileIds: [file.id]
+			}, me);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('fileIds').eql([]);
+		}));
+
+		it('存在しないファイルは無視', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/create', {
+				fileIds: ['000000000000000000000000']
+			}, me);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('fileIds').eql([]);
+		}));
+
+		it('不正なファイルIDで怒られる', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/create', {
+				fileIds: ['kyoppie']
+			}, me);
+			expect(res).have.status(400);
+		}));
+
+		it('返信できる', async(async () => {
+			const bob = await signup({ username: 'bob' });
+			const bobPost = await post(bob);
+
+			const alice = await signup({ username: 'alice' });
+			const alicePost = {
+				text: 'test',
+				replyId: bobPost.id
+			};
+
+			const res = await request('/notes/create', alicePost, alice);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('text').eql(alicePost.text);
+			expect(res.body.createdNote).have.property('replyId').eql(alicePost.replyId);
+			expect(res.body.createdNote).have.property('reply');
+			expect(res.body.createdNote.reply).have.property('text').eql(alicePost.text);
+		}));
+
+		it('renoteできる', async(async () => {
+			const bob = await signup({ username: 'bob' });
+			const bobPost = await post(bob, {
+				text: 'test'
+			});
+
+			const alice = await signup({ username: 'alice' });
+			const alicePost = {
+				renoteId: bobPost.id
+			};
+
+			const res = await request('/notes/create', alicePost, alice);
+
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('renoteId').eql(alicePost.renoteId);
+			expect(res.body.createdNote).have.property('renote');
+			expect(res.body.createdNote.renote).have.property('text').eql(bobPost.text);
+		}));
+
+		it('引用renoteできる', async(async () => {
+			const bob = await signup({ username: 'bob' });
+			const bobPost = await post(bob, {
+				text: 'test'
+			});
+
+			const alice = await signup({ username: 'alice' });
+			const alicePost = {
+				text: 'test',
+				renoteId: bobPost.id
+			};
+
+			const res = await request('/notes/create', alicePost, alice);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('text').eql(alicePost.text);
+			expect(res.body.createdNote).have.property('renoteId').eql(alicePost.renoteId);
+			expect(res.body.createdNote).have.property('renote');
+			expect(res.body.createdNote.renote).have.property('text').eql(bobPost.text);
+		}));
+
+		it('文字数ぎりぎりで怒られない', async(async () => {
+			const me = await signup();
+			const post = {
+				text: '!'.repeat(1000)
+			};
+			const res = await request('/notes/create', post, me);
+			expect(res).have.status(200);
+		}));
+
+		it('文字数オーバーで怒られる', async(async () => {
+			const me = await signup();
+			const post = {
+				text: '!'.repeat(1001)
+			};
+			const res = await request('/notes/create', post, me);
+			expect(res).have.status(400);
+		}));
+
+		it('存在しないリプライ先で怒られる', async(async () => {
+			const me = await signup();
+			const post = {
+				text: 'test',
+				replyId: '000000000000000000000000'
+			};
+			const res = await request('/notes/create', post, me);
+			expect(res).have.status(400);
+		}));
+
+		it('存在しないrenote対象で怒られる', async(async () => {
+			const me = await signup();
+			const post = {
+				renoteId: '000000000000000000000000'
+			};
+			const res = await request('/notes/create', post, me);
+			expect(res).have.status(400);
+		}));
+
+		it('不正なリプライ先IDで怒られる', async(async () => {
+			const me = await signup();
+			const post = {
+				text: 'test',
+				replyId: 'foo'
+			};
+			const res = await request('/notes/create', post, me);
+			expect(res).have.status(400);
+		}));
+
+		it('不正なrenote対象IDで怒られる', async(async () => {
+			const me = await signup();
+			const post = {
+				renoteId: 'foo'
+			};
+			const res = await request('/notes/create', post, me);
+			expect(res).have.status(400);
+		}));
+
+		it('投票を添付できる', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/create', {
+				text: 'test',
+				poll: {
+					choices: ['foo', 'bar']
+				}
+			}, me);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('createdNote');
+			expect(res.body.createdNote).have.property('poll');
+		}));
+
+		it('投票の選択肢が無くて怒られる', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/create', {
+				poll: {}
+			}, me);
+			expect(res).have.status(400);
+		}));
+
+		it('投票の選択肢が無くて怒られる (空の配列)', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/create', {
+				poll: {
+					choices: []
+				}
+			}, me);
+			expect(res).have.status(400);
+		}));
+
+		it('投票の選択肢が1つで怒られる', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/create', {
+				poll: {
+					choices: ['Strawberry Pasta']
+				}
+			}, me);
+			expect(res).have.status(400);
+		}));
+	});
+
+	describe('notes/show', () => {
+		it('投稿が取得できる', async(async () => {
+			const me = await signup();
+			const myPost = await post(me, {
+				text: 'test'
+			});
+			const res = await request('/notes/show', {
+				noteId: myPost.id
+			}, me);
+			expect(res).have.status(200);
+			expect(res.body).be.a('object');
+			expect(res.body).have.property('id').eql(myPost.id);
+			expect(res.body).have.property('text').eql(myPost.text);
+		}));
+
+		it('投稿が存在しなかったら怒る', async(async () => {
+			const res = await request('/notes/show', {
+				noteId: '000000000000000000000000'
+			});
+			expect(res).have.status(400);
+		}));
+
+		it('間違ったIDで怒られる', async(async () => {
+			const res = await request('/notes/show', {
+				noteId: 'kyoppie'
+			});
+			expect(res).have.status(400);
+		}));
+	});
+
+	describe('notes/reactions/create', () => {
+		it('リアクションできる', async(async () => {
+			const bob = await signup({ username: 'bob' });
+			const bobPost = await post(bob);
+
+			const alice = await signup({ username: 'alice' });
+			const res = await request('/notes/reactions/create', {
+				noteId: bobPost.id,
+				reaction: 'like'
+			}, alice);
+
+			expect(res).have.status(204);
+		}));
+
+		it('自分の投稿にはリアクションできない', async(async () => {
+			const me = await signup();
+			const myPost = await post(me);
+
+			const res = await request('/notes/reactions/create', {
+				noteId: myPost.id,
+				reaction: 'like'
+			}, me);
+
+			expect(res).have.status(400);
+		}));
+
+		it('二重にリアクションできない', async(async () => {
+			const bob = await signup({ username: 'bob' });
+			const bobPost = await post(bob);
+
+			const alice = await signup({ username: 'alice' });
+			await react(alice, bobPost, 'like');
+
+			const res = await request('/notes/reactions/create', {
+				noteId: bobPost.id,
+				reaction: 'like'
+			}, alice);
+
+			expect(res).have.status(400);
+		}));
+
+		it('存在しない投稿にはリアクションできない', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/reactions/create', {
+				noteId: '000000000000000000000000',
+				reaction: 'like'
+			}, me);
+			expect(res).have.status(400);
+		}));
+
+		it('空のパラメータで怒られる', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/reactions/create', {}, me);
+			expect(res).have.status(400);
+		}));
+
+		it('間違ったIDで怒られる', async(async () => {
+			const me = await signup();
+			const res = await request('/notes/reactions/create', {
+				noteId: 'kyoppie',
+				reaction: 'like'
+			}, me);
+			expect(res).have.status(400);
+		}));
+	});
 });