登录测试
被测试的代码逻辑

@app.route('/login', methods=['POST'])
def login():
    username = request.form.get('username')
    password = request.form.get('password')

    # 判断参数是否为空
    if not all([username, password]):
        result = {
            "errcode": -2,
            "errmsg": "params error"
        }
        return jsonify(result)

    # a = 1 / 0
    # 如果账号密码正确
    # 判断账号密码是否正确
    if username == 'itheima' and password == 'python':
        result = {
            "errcode": 0,
            "errmsg": "success"
        }
        return jsonify(result)
    else:
        result = {
            "errcode": -1,
            "errmsg": "wrong username or password"
        }
        return jsonify(result)

单元测试代码

import json
import unittest
from demo1_login import app

class LoginTest(unittest.TestCase):
    """为登录逻辑编写测试案例"""

    def setUp(self):
        app.testing = True
        self.client = app.test_client()

    def test_empty_username_password(self):
        """测试用户名与密码为空的情况[当参数不全的话，返回errcode=-2]"""
        response = app.test_client().post('/login', data={})
        json_data = response.data
        json_dict = json.loads(json_data)

        self.assertIn('errcode', json_dict, '数据格式返回错误')
        self.assertEqual(json_dict['errcode'], -2, '状态码返回错误')

        # TODO 测试用户名为空的情况

        # TODO 测试密码为空的情况

    def test_error_username_password(self):
        """测试用户名和密码错误的情况[当登录名和密码错误的时候，返回 errcode = -1]"""
        response = app.test_client().post('/login', data={"username": "aaaaa", "password": "12343"})
        json_data = response.data
        json_dict = json.loads(json_data)
        self.assertIn('errcode', json_dict, '数据格式返回错误')
        self.assertEqual(json_dict['errcode'], -1, '状态码返回错误')

        # TODO 测试用户名错误的情况

        # TODO 测试密码错误的情况

if __name__ == '__main__':
    unittest.main()

数据库测试：

#coding=utf-8
import unittest
from author_book import *

#自定义测试类，setUp方法和tearDown方法会分别在测试前后执行。以test_开头的函数就是具体的测试代码。
class DatabaseTestCase(unittest.TestCase):
    def setUp(self):
        app.config['TESTING'] = True
        app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:mysql@localhost/test0'
        self.app = app
        db.create_all()

    def tearDown(self):
        db.session.remove()
        db.drop_all()

    #测试代码
    def test_append_data(self):
        au = Author(name='xxxxx')
        bk = Book(info='python')
        db.session.add_all([au,bk])
        db.session.commit()
        author = Author.query.filter_by(name='itcast').first()
        book = Book.query.filter_by(info='python').first()
        #断言数据存在
        self.assertIsNotNone(author)
        self.assertIsNotNone(book)