1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/library/stringio/close_write_spec.rb b/spec/ruby/library/stringio/close_write_spec.rb
new file mode 100644
index 0000000000..6637fe6043
--- /dev/null
+++ b/spec/ruby/library/stringio/close_write_spec.rb
@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "StringIO#close_write" do
+  before :each do
+    @io = StringIO.new("example")
+  end
+
+  it "returns nil" do
+    @io.close_write.should be_nil
+  end
+
+  it "prevents further writing" do
+    @io.close_write
+    lambda { @io.write('x') }.should raise_error(IOError)
+  end
+
+  it "allows further reading" do
+    @io.close_write
+    @io.read(1).should == 'e'
+  end
+
+  it "raises an IOError when in read-only mode" do
+    io = StringIO.new("example", "r")
+    lambda { io.close_write }.should raise_error(IOError)
+
+    io = StringIO.new("example")
+    io.close_write
+    ruby_version_is ''...'2.3' do
+      lambda { io.close_write }.should raise_error(IOError)
+    end
+    ruby_version_is '2.3' do
+      io.close_write.should == nil
+    end
+  end
+end