on long strings, rspec may not display the part of the string that does not match #30
Description
I'm trying to track down an error in a flaky test. Unfortunately the string output presented by rspec does not display the problem.
The following test should be enough to demonstrate the problem:
describe 'a long string' do
it 'shows the right part of the diff' do
got = "a"*100 + "Z" + "a"*100
want = "a" * (1 + 100*2)
expect(got).to eq(want)
end
endYields the following output:
Failures:
1) a long string shows the right part of the diff
Failure/Error: expect(got).to eq(want)
expected: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
got: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
(compared using ==)
# ./longstring_spec.rb:5:in `block (2 levels) in <top (required)>'
The strings displayed by rspec are identical; the diff is in the truncated part. If the string is any shorter, the diff appears correctly.
Running on a Mac in iTerm2.
$ rspec --version
RSpec 3.7
- rspec-core 3.7.1
- rspec-expectations 3.7.0
- rspec-mocks 3.7.0
- rspec-support 3.7.1