[TestUnit pack] Unequal equality

ruby-talk
1

I've got such that output during testing my program:
[terminal_output]
Loaded suite ./niep_test
Started
....F.
Finished in 0.009922 seconds.

   1) Failure:
test_sanity(SFTester)
     [./niep_test.rb:12:in `sanity'
      ./niep_test.rb:19:in `test_sanity']:
<7.8e-11> expected but was
<7.8e-11>.

6 tests, 9 assertions, 1 failures, 0 errors
[/terminal_output]

A you can see the assert_equal function reports that something equal is not equal. WTF? Is it some bug in TestUnit package, or my program just looks to work fine?

2

Probably it's due to IEEE floating point inaccuracy. Try using assert_in_delta instead of assert_equal whenever you compare floats in a test.

···

On 10/15/2010 11:45 AM, felix.leg wrote:

I've got such that output during testing my program:
[terminal_output]
Loaded suite ./niep_test
Started
....F.
Finished in 0.009922 seconds.

1) Failure:
test_sanity(SFTester)
[./niep_test.rb:12:in `sanity'
./niep_test.rb:19:in `test_sanity']:
<7.8e-11> expected but was
<7.8e-11>.

6 tests, 9 assertions, 1 failures, 0 errors
[/terminal_output]

A you can see the assert_equal function reports that something equal is
not equal. WTF? Is it some bug in TestUnit package, or my program just
looks to work fine?

3

Welcome to floating point math. Equality is a no-no with floats. What you want is assert_in_delta.

···

On Oct 15, 2010, at 11:45 , felix.leg wrote:

A you can see the assert_equal function reports that something equal is not equal. WTF? Is it some bug in TestUnit package, or my program just looks to work fine?