Fix an issue with negative hunk max_size

Resolves #57.

- The `diff_size` should be an absolute value.
- Added a test to ensure that the issue does not introduce a regression.

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/issues_spec.rb b/spec/issues_spec.rb
index 79ddd0b..c4542bb 100644
--- a/spec/issues_spec.rb
+++ b/spec/issues_spec.rb
@@ -54,4 +54,14 @@ describe 'Diff::LCS Issues' do
       ]
     end
   end
+
+  describe "issue #57" do
+    it 'should fail with a correct error' do
+      expect {
+        actual = {:category=>"app.rack.request"}
+        expected = {:category=>"rack.middleware", :title=>"Anonymous Middleware"}
+        expect(actual).to eq(expected)
+      }.to raise_error(RSpec::Expectations::ExpectationNotMetError)
+    end
+  end
 end