vm.c: add RubyVM.stat for accessing cache serials

* vm.c (ruby_vm_stat): add RubyVM.stat() for access to internal cache
  counters. this methods behaves like GC.stat, accepting an optional
  hash or symbol argument. [Bug #9190] [ruby-core:58750]
* test/ruby/test_rubyvm.rb: test for new method

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44062 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 16 insertions, 0 deletions

diff --git a/test/ruby/test_rubyvm.rb b/test/ruby/test_rubyvm.rb
new file mode 100644
index 0000000000..c63ee9f2c4
--- /dev/null
+++ b/test/ruby/test_rubyvm.rb
@@ -0,0 +1,16 @@
+require 'test/unit'
+
+class TestRubyVM < Test::Unit::TestCase
+  def test_stat
+    assert_kind_of Hash, RubyVM.stat
+    assert_kind_of Fixnum, RubyVM.stat[:method_serial]
+
+    RubyVM.stat(stat = {})
+    assert_not_empty stat
+    assert_equal stat[:method_serial], RubyVM.stat(:method_serial)
+  end
+
+  def test_stat_unknown
+    assert_raise(ArgumentError){ RubyVM.stat(:unknown) }
+  end
+end