Why does this require fail from rake but succeed when ran explicitly?

问题

Help me understand why this project's tests run when executed directly but do not when run via rake. The error when run via a Rake TestTask:

** Execute test
/home/myockey/.rvm/rubies/ruby-1.9.2-p136/bin/ruby -I"lib:test" "/home/myockey/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.8.7/lib/rake/rake_test_loader.rb" "test/unit/data_test.rb" "test/unit/station_test.rb" "test/unit/raw_test.rb" "test/unit/parser_test.rb" "test/unit/report_test.rb" 
<internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- test/unit/../metar_test_helper.rb (LoadError)
    from <internal:lib/rubygems/custom_require>:29:in `require'
    from test/unit/data_test.rb:4:in `<top (required)>'
    from /home/myockey/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `load'
    from /home/myockey/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `block in <main>'
    from /home/myockey/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `each'
    from /home/myockey/.rvm/gems/ruby-1.9.2-p136/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `<main>'
rake aborted!

When I run the script directly I get the following:

myockey@myockey-K61IC:~/opt/joeyates-metar-parser-cdca19f/test/unit$ ruby data_test.rb 
Loaded suite data_test
Started
...................................................
Finished in 0.084939 seconds.

51 tests, 121 assertions, 0 failures, 0 errors, 0 skips

The top of the ruby files looks like this:

#!/usr/bin/env ruby
# encoding: utf-8

require File.dirname(__FILE__) + '/../metar_test_helper'

class TestMetarData < Test::Unit::TestCase

Note that I tried adding the .rb file extension to metar_test_helper to no avail. Rest assured that a file named metar_test_helper.rb exists in the parent directory of the file and that it has sufficient permissions to be accessible.

Added a bounty. I know this must be a simple path issue, but I'd really appreciate some guidance solving it and helping me understand it.

回答1:

Are you using Ruby 1.9.2 in both scenarios?

1.9.2 doesn't include "." in the path ($:), whereas pre-1.9.2 versions do.

To check what version of Ruby you're using, and what the path is, do

STDERR.puts "RUBY_VERSION is #{RUBY_VERSION}"
STDERR.puts "Path is #{$:}"

before the exception-inducing line

require File.dirname(__FILE__) + '/../metar_test_helper'

If that doesn't solve it, ask it what it's requiring, by doing

STDERR.puts "The file I'm requiring is #{File.dirname(__FILE__) + '/../metar_test_helper'}"

and see what it's like in both approaches.

You may want to see other tips on debugging in How do I debug Ruby scripts?

回答2:

This is just a path issue that you need to resolve. When you are running the test manually you are in the test/unit directory which appears to have that file 1 level up. In the rake task you are at the parent of the test dir (assuming RAILS_HOME).

来源：https://stackoverflow.com/questions/5495386/why-does-this-require-fail-from-rake-but-succeed-when-ran-explicitly

标签

ruby

rake