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unit testing: example p. 156 pickaxe2

7stud 7stud

9/29/2007 1:02:00 PM

How do you make this example fail:

require "test/unit"

class TestsWhichFail < Test::Unit::TestCase
def test_reading
assert_not_nil(ARGF.read, "Read next line of input")
end
end


I tried specifying an empty file on the command line, no file, a file
with two words in it, and a file that doesn't exist, but I can't get it
to fail. Yet, the output in the book shows:

1 tests, 1 assertions, 1 failures, 0 errors
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2 Answers

7stud 7stud

10/1/2007 4:28:00 AM

0

Anyone?
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7stud 7stud

10/1/2007 9:40:00 AM

0

7stud -- wrote:
> How do you make this example fail:
>
> require "test/unit"
>
> class TestsWhichFail < Test::Unit::TestCase
> def test_reading
> assert_not_nil(ARGF.read, "Read next line of input")
> end
> end
>

If I add this line:

ARGF.read #<---***
assert_not_nil(ARGF.read, "Read next line of input")

and I specify a data file name on the command line, then the test fails.
Curiously, if I omit specifying a data file name on the command line,
and I type ^D while the program is running, I can't get the test to
fail.




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