Hi,
I'm trying to use RSpec (latest version, 2.1.0) with MacRuby, but there seems
to be information missing from the exception backtraces which makes it
difficult to see where exactly specs fail.
Running a straightforward helloworld_spec.rb with a failing example for
instance, shows a reference to the failing line (hello_world.greeting.should ==
"Hello World!") in MRI Ruby 1.9.2:
Failures:
1) A new HelloWorld object should return the appropriate greeting
Failure/Error: hello_world.greeting.should == "Hello World!"
expected: "Hello World!",
got: "Hello Earth!" (using ==)
# ./Spec/helloworld_spec.rb:6:in `block (2 levels) in <top (required)>'
In MacRuby (0.7.1) however, RSpec displays a 'Failure/Error: Unable to find
matching line from backtrace' instead, which makes sense with no traces present
referring to the actual spec:
Failures:
1) A new HelloWorld object should return the appropriate greeting
Failure/Error: Unable to find matching line from backtrace
expected: "Hello World!",
got: "Hello Earth!" (using ==)
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:41:in
`block'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:39:in
`block'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:75:in
`block'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:74:in
`with_pending_capture'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:32:in
`run:'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example_group.rb:260:in
`block'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example_group.rb:257:in
`run_examples:'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/example_group.rb:222:in
`run:'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/command_line.rb:26:in
`block'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/command_line.rb:15:in
`run:'
#
/usr/local/rvm/gems/macruby-0....@test/gems/rspec-core-2.1.0/lib/rspec/core/runner.rb:10:in
`block'
'
Looking at the complete backtrace in MRI Ruby 1.9.2 shows there seems to be a
lot of information missing from the MacRuby backtrace. Apart from missing
information about the context of a block and other differences in descriptions,
MacRuby doesn't seem to list any traces beyond the instance_eval. The RSpec
source (example.rb) shows it indeed uses instance_eval to evaluate the example
block. I checked the backtraces in the rescue clauses there, but they don't
contain traces from any execution beyond the instance_eval call. Is loss of
exception backtraces in instance_eval a known limitations of MacRuby? Are there
any plans to improve backtraces?
Failures:
1) A new HelloWorld object should return the appropriate greeting
Failure/Error: hello_world.greeting.should == "Hello World!"
expected: "Hello World!",
got: "Hello Earth!" (using ==)
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-expectations-2.1.0/lib/rspec/expectations/fail_with.rb:29:in
`fail_with'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-expectations-2.1.0/lib/rspec/matchers/operator_matcher.rb:48:in
`fail_with_message'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-expectations-2.1.0/lib/rspec/matchers/operator_matcher.rb:70:in
`__delegate_operator'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-expectations-2.1.0/lib/rspec/matchers/operator_matcher.rb:60:in
`eval_match'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-expectations-2.1.0/lib/rspec/matchers/operator_matcher.rb:29:in
`block in use_custom_matcher_or_delegate'
# ./Spec/helloworld_spec.rb:6:in `block (2 levels) in <top (required)>'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:42:in
`instance_eval'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:42:in
`block (2 levels) in run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:81:in
`call'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:81:in
`with_around_hooks'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:39:in
`block in run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:75:in
`call'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:75:in
`block in with_pending_capture'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:74:in
`catch'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:74:in
`with_pending_capture'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example.rb:38:in
`run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example_group.rb:261:in
`block in run_examples'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example_group.rb:257:in
`map'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example_group.rb:257:in
`run_examples'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/example_group.rb:231:in
`run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/command_line.rb:27:in
`block (2 levels) in run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/command_line.rb:27:in
`map'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/command_line.rb:27:in
`block in run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/reporter.rb:12:in
`report'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/command_line.rb:24:in
`run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/runner.rb:55:in
`run_in_process'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/runner.rb:46:in
`run'
#
/usr/local/rvm/gems/ruby-1.9.2...@test/gems/rspec-core-2.1.0/lib/rspec/core/runner.rb:10:in
`block in autorun'
Just for completeness' sake, this is the code from example.rb that runs the
example:
begin
unless pending
with_pending_capture do
with_around_hooks do
begin
run_before_each
@example_group_instance.instance_eval(&@example_block)
rescue Exception => e
set_exception(e)
ensure
run_after_each
end
end
end
end
rescue Exception => e
set_exception(e)
ensure
@example_group_instance.example = nil
assign_auto_description
end
Thanks,
Martijn
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