Actually, this is evidently not the whole story. I actually have two
examples in the same spec, and I just realized that the other one has
instances of file.should_receive(:puts) that don't seem to suffer the
same limitation I described. So it looks like there is something about
the example I described that is causing it to behave strangely. Will
investigate further.
Mark.
Mark Thomson wrote:
I'm writing my first controller spec - for a controller that already
exists, and in the process have observed some behavior I find a little
surprising. I'd like to know whether I'm interpreting the situation
correctly...
In my controller I have some stuff written to a file, i.e.
file = File.new(...)
...
file.puts "a string"
...
file.puts "another string"
etc
In my spec I mock the file object -
file = mock('file')
File.stub!(:new).and_return(file)
and then check that the expected messages are being received -
file.should_receive(:puts).with("a string").once
file.should_receive(:puts).with("another string").once
etc.
Here's what I'm puzzled about. If I don't include the expectation for
the first string in the spec, the spec will fail the expectation for
the second string. It seems as if "should_receive" is queuing up the
messages that come into the file object and when it tests an
expectation it just looks at the next one in line. If it doesn't match
then the expectation will fail.
Is that really what happens? Or have I missed some important insight?
Seems counterintuitive to me. What is strange is that I was working
away on this yesterday and just picking out a number of particular
puts to test that I was concerned about. It seemed to be working the
way I expected it to. Then late yesterday I started seeing some spec
failures I didn't understand and my investigation led me to the
conclusion above.
Interested to know if what I think I'm seeing is consistent with other
people's experience and with the intended behavior of mocks.
Mark.
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