From: Tanaka Akira <akr@...>
Date: 2008-10-18T10:23:45+09:00
Subject: [ruby-core:19372] assert_in_delta(1.4, 1.4, 0) failes in minitest

assert_in_delta(1.4, 1.4, 0) fails in minitest.
But success in test/unit in ruby 1.8.

% cat zm.rb
require 'minitest/unit'

class TestDelta < MiniTest::Unit::TestCase
  def test_delta
    assert_in_delta(1.4, 1.4, 0)
  end
end

MiniTest::Unit.autorun
% ./ruby zm.rb
Loaded suite zm
Started
F
Finished in 0.001550 seconds.

  1) Failure:
test_delta(TestDelta) [zm.rb:5]:
Expected 1.4 - 1.4 (0.0) to be < 0.

1 tests, 1 assertions, 1 failures, 0 errors, 0 skips

% ruby-1.8 zt.rb 
Loaded suite zt
Started
.
Finished in 0.001256 seconds.

1 tests, 1 assertions, 0 failures, 0 errors

Is the difference intentional?

If it is not intentional, following patch fix it.

% svn diff --diff-cmd diff -x -u lib/minitest/unit.rb
Index: lib/minitest/unit.rb
===================================================================
--- lib/minitest/unit.rb	(revision 19827)
+++ lib/minitest/unit.rb	(working copy)
@@ -87,7 +87,7 @@
     def assert_in_delta exp, act, delta = 0.001, msg = nil
       n = (exp - act).abs
       msg = message(msg) { "Expected #{exp} - #{act} (#{n}) to be < #{delta}" }
-      assert delta > n, msg
+      assert delta >= n, msg
     end
 
     def assert_in_epsilon a, b, epsilon = 0.001, msg = nil
-- 
Tanaka Akira