# What is the purpose of the change
add the unit test of the HeaderExchangeChannel.class which is located in
incubator-dubbo-master\dubbo-remoting\dubbo-remoting-api\src\main\java\org\apache\dubbo\remoting\exchange\support\header\HeaderExchangeChannel.java
# Brief changelog
### 1.Add HeaderExchangeChannelTest.class
add the unit tests for the methds as follows:
- HeaderExchangeChannel getOrAddChannel(Channel ch)
- void removeChannelIfDisconnected(Channel ch)
- void send(Object message
- void send(Object message, boolean sent)
- ResponseFuture request(Object request)
- ResponseFuture request(Object request, int timeout)
- boolean isClosed()
- void close()
- void close(int timeout)
- void startClose()
- InetSocketAddress getLocalAddress()
- InetSocketAddress getRemoteAddress()
- URL getUrl()
- boolean isConnected()
- ChannelHandler getChannelHandler()
- ExchangeHandler getExchangeHandler()
- Object getAttribute(String key)
- void setAttribute(String key, Object value)
- void removeAttribute(String key)
- boolean hasAttribute(String key)
- int hashCode()
### 2.Modify MockChannel.class
add the method:
```
public boolean isClosing(){return closing;}
```
## Verifying this change
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without pulling in other changes - one PR resolves one issue.
- [ ] Format the pull request title like `[Dubbo-XXX] Fix UnknownException when
host config not exist #XXX`. Each commit in the pull request should have a
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- [ ] Write a pull request description that is detailed enough to understand
what the pull request does, how, and why.
- [ ] Write necessary unit-test to verify your logic correction, more mock a
little better when cross module dependency exist. If the new feature or
significant change is committed, please remember to add integration-test in
[test module](https://github.com/apache/incubator-dubbo/tree/master/dubbo-test).
- [ ] Run `mvn clean install -DskipTests` & `mvn clean test-compile
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[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/2359 ]
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