Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 35 insertions, 0 deletions

diff --git a/spec/mspec/lib/mspec/matchers/block_caller.rb b/spec/mspec/lib/mspec/matchers/block_caller.rb
new file mode 100644
index 0000000000..5451950712
--- /dev/null
+++ b/spec/mspec/lib/mspec/matchers/block_caller.rb
@@ -0,0 +1,35 @@
+class BlockingMatcher
+  def matches?(block)
+    started = false
+    blocking = true
+
+    thread = Thread.new do
+      started = true
+      block.call
+
+      blocking = false
+    end
+
+    while !started and status = thread.status and status != "sleep"
+      Thread.pass
+    end
+    thread.kill
+    thread.join
+
+    blocking
+  end
+
+  def failure_message
+    ['Expected the given Proc', 'to block the caller']
+  end
+
+  def negative_failure_message
+    ['Expected the given Proc', 'to not block the caller']
+  end
+end
+
+class Object
+  def block_caller(timeout = 0.1)
+    BlockingMatcher.new
+  end
+end