Exception: Exception

Defined in:
lib/cucumber/core_ext/exception.rb

Overview

Exception extension that tweaks Exception backtraces:

  • The line of the failing .feature line is appended to the backtrace

  • The line that calls #cucumber_instance_exec is replaced with the StepDefinition’s regexp

  • Non intersting lines are stripped out

The result is that backtraces look like this:

features/step_definitions/the_step_definition.rb:in `/some step/'
features/the_feature_file.feature:41:in `Given some step'

or if the exception is raised in the tested code:

lib/myapp/some_file.rb:in `/some_method/'
lib/myapp/some_other_file.rb:in `/some_other_method/'
features/step_definitions/the_step_definition.rb:in `/some step/'
features/the_feature_file.feature:41:in `Given some step'

All backtrace munging can be turned off with the --backtrace switch

Constant Summary collapse

CUCUMBER_FILTER_PATTERNS = 
[
  /vendor\/rails|lib\/cucumber|bin\/cucumber:|lib\/rspec|gems\//
]
INSTANCE_EXEC_OFFSET = 
(Cucumber::RUBY_1_9 || Cucumber::JRUBY) ? -3 : -4

Class Method Summary collapse

Class Method Details

.cucumber_full_backtrace=(v) ⇒ Object 



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# File 'lib/cucumber/core_ext/exception.rb', line 28

def self.cucumber_full_backtrace=(v)
  @@cucumber_full_backtrace = v
end

.cucumber_strip_backtrace!(backtrace, instance_exec_invocation_line, pseudo_method) ⇒ Object

Strips the backtrace from line and down



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# File 'lib/cucumber/core_ext/exception.rb', line 34

def self.cucumber_strip_backtrace!(backtrace, instance_exec_invocation_line, pseudo_method)
  return if @@cucumber_full_backtrace

  instance_exec_pos = backtrace.index(instance_exec_invocation_line)
  if instance_exec_pos
    replacement_line = instance_exec_pos + INSTANCE_EXEC_OFFSET
    backtrace[replacement_line].gsub!(/`.*'/, "`#{pseudo_method}'") if pseudo_method
    backtrace[replacement_line+1..-1] = nil

    backtrace.compact!
  else
    # This happens with rails, because they screw up the backtrace
    # before we get here (injecting erb stacktrace and such)
  end

  backtrace.reject! do |line|
    CUCUMBER_FILTER_PATTERNS.detect{|p| line =~ p}
  end
end