1 files changed, 35 insertions, 0 deletions
diff --git a/spec/ruby/core/io/pid_spec.rb b/spec/ruby/core/io/pid_spec.rb
new file mode 100644
index 0000000000..04956887ff
--- /dev/null
+++ b/spec/ruby/core/io/pid_spec.rb
@@ -0,0 +1,35 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "IO#pid" do
+  before :each do
+    @io = IOSpecs.io_fixture "lines.txt"
+  end
+
+  after :each do
+    @io.close if @io
+  end
+
+  it "returns nil for IO not associated with a process" do
+    @io.pid.should == nil
+  end
+end
+
+describe "IO#pid" do
+  before :each do
+    @io = IO.popen ruby_cmd('STDIN.read'), "r+"
+  end
+
+  after :each do
+    @io.close if @io && !@io.closed?
+  end
+
+  it "returns the ID of a process associated with stream" do
+    @io.pid.should_not == nil
+  end
+
+  it "raises an IOError on closed stream" do
+    @io.close
+    -> { @io.pid }.should.raise(IOError)
+  end
+end