CODEWITHSUNDEEP
javasocketsmockingmockito
Sardathrion - against SE abuse
Sardathrion - against SE abuse

Reputation: 18246

Mocking sockets in java with mockito

I am trying to mock the following call:

s.socket().bind(new InetSocketAddress(serverIPAddress_, serverPort_), 0);

so I can test what the rest of the code does when this fails in predictable ways. I use this in my test case:

ServerSocketChannel ssc = mock(ServerSocketChannel.class);
when(ServerSocketChannel.open()).thenReturn(ssc);
doNothing().when(ssc.socket().bind(any(), anyInt()));

However, the above does not compile with:

[javac] /home/yann/projects/flexnbd/src/uk/co/bytemark/flexnbd/FlexNBDTest.java:147: cannot find symbol
[javac] symbol  : method bind(java.lang.Object,int)
[javac] location: class java.net.ServerSocket
[javac]       doNothing().when(ssc.socket().bind(any(), anyInt()));
[javac]                                    ^
[javac] 1 error

Any idea what I am doing wrong?

Upvotes: 2

Views: 8659

Answers (2)

Matthew Flaschen
Matthew Flaschen

Reputation: 284786

ServerSocket has no bind overload that takes an Object and an int. It has an overload that takes a SocketAddress and an int. I haven't used Mockito, but I think you may need:

doNothing().when(ssc.socket().bind(isA(ServerSocket.class), anyInt()));

EDIT: The latest error is because you're trying to pass void to the when method. The docs note, "void methods on mocks do nothing by default.", so you may not need this line at all.

Upvotes: 1

Bruno
Bruno

Reputation: 122599

The signatures for bind are bind(java.net.SocketAddress) or bind(java.net.SocketAddress,int), but you're giving it a java.lang.Object.

If you're sure that the runtime type returned by any() is a java.net.SocketAddress, you can cast it:

ssc.socket().bind((SocketAddress)any(), anyInt())

(Of course, if it's not you'll get a ClassCastException.)

Upvotes: 1

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