我正试图让米奇•傅（metric fu）在一个与我合作的rails项目上运行。每次运行rcov部分指标时，我都会得到：
** Invoke metrics:all (first_time)
** Execute metrics:all
No file to analyze was found. All the files loaded by rcov matched one of the
following expressions, and were thus ignored:
[/\A\/System\/Library\/Frameworks\/Ruby\.framework\/Versions\/1\.8\/usr\/lib/,
/\btc_[^.]*.rb/,
/_test\.rb\z/,
/\btest\//,
/\bvendor\//,
/\A\/Library\/Ruby\/Gems\/1\.8\/gems\/rcov\-0\.9\.7\.1\/lib\/rcov\/formatters\/base_formatter\.rb\z/,
/\bvendor\//,
/\bconfig\//,
/\benvironment\//,
/\/gems\//,
/\/Library\//,
/spec/]
You can solve this by doing one or more of the following:
* rename the files not to be ignored so they don't match the above regexps
* use --include-file to give a list of patterns for files not to be ignored
* use --exclude-only to give the new list of regexps to match against
* structure your code as follows:
test/test_*.rb for the test cases
lib/**/*.rb for the target source code whose coverage you want
making sure that the test/test_*.rb files are loading from lib/, e.g. by
using the -Ilib command-line argument, adding
$:.unshift File.join(File.dirname(__FILE__), "..", "lib")
to test/test_*.rb, or running rcov via a Rakefile (read the RDoc
documentation or README.rake in the source distribution).
rake aborted!
NaN
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/float/rounding.rb:19:in `round_without_precision'
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.3/lib/active_support/core_ext/float/rounding.rb:19:in `round'
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/base/generator.rb:135:in `round_to_tenths'
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/generators/rcov.rb:84:in `to_h'
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/base/generator.rb:131:in `generate_report'
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/base/generator.rb:53:in `generate_report'
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/base/report.rb:54:in `add'
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/../tasks/metric_fu.rake:6
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/../tasks/metric_fu.rake:6:in `each'
/Library/Ruby/Gems/1.8/gems/metric_fu-1.2.0/lib/../tasks/metric_fu.rake:6
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/Library/Ruby/Gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19
单独运行rcov也会遇到同样的问题。如果有帮助的话，我使用的是rspec而不是testunit。
最佳答案
如果使用rake启动metric_fu，则可以使用以下代码段将任何目录添加到rcov路径：
begin
require 'metric_fu'
MetricFu::Configuration.run do |config|
config.rcov[:rcov_opts] << "-Ispec"
end
rescue LoadError
end
这会将-ispec标志添加到rcov选项中，而rcov选项又会将“spec”目录添加到rcov的路径中。