Eta-expansion of zero-argument method values is deprecated

[jpork]

Using scala-2.12.4, java9 and scalamock-3.6.0 I get for the follwing code:

val process = stub[Process]
    (process.getInputStream _ ).when().returns(new ByteArrayInputStream("data".getBytes(UTF_8)))

the following Eta-expansion deprecation warning:

Eta-expansion of zero-argument method values is deprecated. Did you intend to write process.getInputStream()?
    (process.getInputStream _ ).when().returns(new ByteArrayInputStream("data".getBytes(UTF_8)))

What can I do in order to prevent this warning?

[barkhorn]

I recently merged a PR which sounds similar: #219

that changed
(mockTurtle.penUp _) expects ()
to
(() => mockTurtle.penUp) expects ()

Keep in mind that Scalamock 3.6.0 is not supported anymore, you should consider using 4.1.0 now.