Upgrade JUnit and Truth

JUnit might need test scope too. 

```
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.2</version>
      </dependency>
      <dependency>
        <groupId>com.google.truth</groupId>
        <artifactId>truth</artifactId>
        <version>0.40</version>
        <scope>test</scope>
      </dependency>
```