Measure the test coverage without SimpleCov

Now `make test-all COVERAGE=true` measures the test coverage by using
`coverage.so` directly, and visualize the result by simplecov-html.

There has been some problems in coverage measurement with SimpleCov.
(They are not SimpleCov's fault, though.)

(1) It is difficult to extract the measured data as a machine-readable
format, such as Marshal.  I want to visualize the coverage data with
other coverage tools, such as LCOV and Cobertura.
(I know we can use SimpleCov's formatter mechanism, but I don't want
to depend upon SimpleCov so much.)

(2) SimpleCov seems to miss some coverage data.  For example,
`lib/cgi.rb` and `lib/ostruct.rb` are dropped.  I don't know why.

(3) I have a plan to enhance `coverage.so` with branch coverage.
It would be difficult to continue to only use SimpleCov as is.
This is the most important reason.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59770 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 8 deletions

diff --git a/test/runner.rb b/test/runner.rb
index 1fe32fcfc8..02cc4610df 100644
--- a/test/runner.rb
+++ b/test/runner.rb
@@ -26,14 +26,7 @@ require_relative 'lib/zombie_hunter'
 require_relative 'lib/iseq_loader_checker'
 
 if ENV['COVERAGE']
-  %w[doclie simplecov-html simplecov].each do |f|
-    $LOAD_PATH.unshift "#{src_testdir}/../coverage/#{f}/lib"
-  end
-
-  require 'simplecov'
-  SimpleCov.start do
-    add_filter "/test/"
-  end
+  require "tool/test-coverage.rb"
 end
 
 begin