Issue #19857 has been updated by mame (Yusuke Endoh).
By the way, did you realise, eval coverage is already merged, if it's a subset of the eval'ed code?
Yes, I think that that is bad. I think I missed it because I didn't review https://github.com/ruby/ruby/pull/6396 enough. I want to limit it even from now. I think "coverage for eval" feature was a good idea for measuring the coverage of Rails view code, but I would like to design it to the minimum necessary for that purpose. Currently, I think it is too flexible than I expected. The design I am currently considering is as follows. * If there are loaded and eval'ed codes with the same path, only the loaded code is measured * If there are multiple codes eval'd with the same path, the first (or the last) eval'ed code is measured I need to take time to understand and organize the current situation and carefully consider how it should be designed. However, I am not likely to be able to spend sufficient time to the coverage library for a while, so please wait. BTW, I'm not keen on having `Coverage.start` have a new keyword argument for this purpose. Coverage library already has many different modes. I don't want to complicate things further. (This is mostly my fault, of course.) ---------------------------------------- Bug #19857: Eval coverage is reset after each `eval`. https://bugs.ruby-lang.org/issues/19857#change-104488 * Author: ioquatix (Samuel Williams) * Status: Open * Priority: Normal * Assignee: ioquatix (Samuel Williams) * Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED ---------------------------------------- It seems like `eval` based coverage is reset every time eval is invoked. ```ruby #!/usr/bin/env ruby require 'coverage' def measure(flag) c = Class.new c.class_eval(<<~RUBY, "foo.rb", 1) def foo(flag) if flag puts "foo" else puts "bar" end end RUBY return c.new.foo(flag) end Coverage.start(lines: true, eval: true) # Depending on the order of these two operations, different coverage is calculated, because the evaluation of the code is considered different, even if the content/path is the same. measure(false) measure(true) p Coverage.result ``` Further investigation is required. -- https://bugs.ruby-lang.org/