- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of
this repository and believe that this is not a duplicate.
- [x] I have checked the
[FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository
and believe that this is not a duplicate.
### Environment
* Dubbo version: 2.7.4-SNAPSHOT
* Operating System version: "mac os x", version: "10.12.6", arch: "x86_64",
family: "mac"
* Java version: 1.8.0_131
### Steps to reproduce this issue
1. just run UT `EtcdMetadataReportTest.testStoreConsumer` in IDEA
or `mvn clean install -DskipTests=false` from cmd.
### Expected Result
UT succeeds
### Actual Result
Ex:
#### IDEA
```
java.lang.NoClassDefFoundError: com/google/common/base/Preconditions
at io.etcd.jetcd.ClientBuilder.endpoints(ClientBuilder.java:82)
at
org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest.setUp(EtcdMetadataReportTest.java:64
```
#### mvn build with clean install
```
[ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 1, Time elapsed: 4.798 s
<<< FAILURE! - in org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest
[ERROR] testStoreConsumer Time elapsed: 2.127 s <<< ERROR!
java.lang.NoClassDefFoundError: com/google/common/base/Preconditions
at
org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest.setUp(EtcdMetadataReportTest.java:64)
Caused by: java.lang.ClassNotFoundException:
com.google.common.base.Preconditions
at
org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest.setUp(EtcdMetadataReportTest.java:64)
[ Full content available at: https://github.com/apache/dubbo/issues/5080 ]
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