1 files changed, 68 insertions, 0 deletions
diff --git a/spec/ruby/core/io/close_write_spec.rb b/spec/ruby/core/io/close_write_spec.rb
new file mode 100644
index 0000000000..60b41505c3
--- /dev/null
+++ b/spec/ruby/core/io/close_write_spec.rb
@@ -0,0 +1,68 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "IO#close_write" do
+  before :each do
+    cmd = platform_is(:windows) ? 'rem' : 'cat'
+    @io = IO.popen cmd, 'r+'
+    @path = tmp('io.close.txt')
+  end
+
+  after :each do
+    @io.close unless @io.closed?
+    rm_r @path
+  end
+
+  it "closes the write end of a duplex I/O stream" do
+    @io.close_write
+
+    -> { @io.write "attempt to write" }.should.raise(IOError)
+  end
+
+  it "does nothing on subsequent invocations" do
+    @io.close_write
+
+    @io.close_write.should == nil
+  end
+
+  it "allows subsequent invocation of close" do
+    @io.close_write
+
+    -> { @io.close }.should_not.raise
+  end
+
+  it "raises an IOError if the stream is readable and not duplexed" do
+    io = File.open @path, 'w+'
+
+    begin
+      -> { io.close_write }.should.raise(IOError)
+    ensure
+      io.close unless io.closed?
+    end
+  end
+
+  it "closes the stream if it is neither readable nor duplexed" do
+    io = File.open @path, 'w'
+
+    io.close_write
+
+    io.should.closed?
+  end
+
+  # Windows didn't have command like cat
+  platform_is_not :windows do
+    it "flushes and closes the write stream" do
+      @io.puts '12345'
+
+      @io.close_write
+
+      @io.read.should == "12345\n"
+    end
+  end
+
+  it "does nothing on closed stream" do
+    @io.close
+
+    @io.close_write.should == nil
+  end
+end