真是奇怪，在我创建测试类之前还可以连接数据库不报错，创建测试类后就报错了

Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)
	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:81) ~[spring-jdbc-5.0.0.RC3.jar:5.0.0.RC3]
	at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:319) ~[spring-jdbc-5.0.0.RC3.jar:5.0.0.RC3]
	... 61 common frames omitted
Caused by: java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:873) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1710) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1226) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2198) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2229) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2024) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:779) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_121]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_121]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_121]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_121]
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) ~[mysql-connector-java-5.1.43.jar:5.1.43]
	at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:112) ~[HikariCP-2.6.3.jar:na]
	at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:358) ~[HikariCP-2.6.3.jar:na]
	at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:201) ~[HikariCP-2.6.3.jar:na]

在我最早看师兄springboot项目时也报同样错误，后来网上说是我的密码是数字给我解析成数字什么的我加上双引号之后果断可以了，但是现在无论加不加都报上图错误，application.yml如下：

spring:
  application:
    name: product
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    data-username: root
    data-password: "0821"
    url: jdbc:mysql://127.0.0.1/SpringCloud_Sell?CharacterEncoding=utf-8&useSSL=false
  jpa:
    show-sql: true
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

不知老师遇到过没还请老师指点