1 files changed, 85 insertions, 0 deletions
diff --git a/spec/rubyspec/core/io/read_nonblock_spec.rb b/spec/rubyspec/core/io/read_nonblock_spec.rb
new file mode 100644
index 0000000000..2b314987bc
--- /dev/null
+++ b/spec/rubyspec/core/io/read_nonblock_spec.rb
@@ -0,0 +1,85 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "IO#read_nonblock" do
+  before :each do
+    @read, @write = IO.pipe
+  end
+
+  after :each do
+    @read.close if @read && !@read.closed?
+    @write.close if @write && !@write.closed?
+  end
+
+  it "raises an exception extending IO::WaitReadable when there is no data" do
+    lambda { @read.read_nonblock(5) }.should raise_error(IO::WaitReadable) { |e|
+      platform_is_not :windows do
+        e.should be_kind_of(Errno::EAGAIN)
+      end
+      platform_is :windows do
+        e.should be_kind_of(Errno::EWOULDBLOCK)
+      end
+    }
+  end
+
+  ruby_version_is "2.3" do
+    context "when exception option is set to false" do
+      context "when there is no data" do
+        it "returns :wait_readable" do
+          @read.read_nonblock(5, exception: false).should == :wait_readable
+        end
+      end
+
+      context "when the end is reached" do
+        it "returns nil" do
+          @write << "hello"
+          @write.close
+
+          @read.read_nonblock(5)
+
+          @read.read_nonblock(5, exception: false).should be_nil
+        end
+      end
+    end
+  end
+
+  it "returns at most the number of bytes requested" do
+    @write << "hello"
+    @read.read_nonblock(4).should == "hell"
+  end
+
+  it "returns less data if that is all that is available" do
+    @write << "hello"
+    @read.read_nonblock(10).should == "hello"
+  end
+
+  it "allows for reading 0 bytes before any write" do
+    @read.read_nonblock(0).should == ""
+  end
+
+  it "allows for reading 0 bytes after a write" do
+    @write.write "1"
+    @read.read_nonblock(0).should == ""
+    @read.read_nonblock(1).should == "1"
+  end
+
+  it "reads into the passed buffer" do
+    buffer = ""
+    @write.write("1")
+    @read.read_nonblock(1, buffer)
+    buffer.should == "1"
+  end
+
+  it "raises IOError on closed stream" do
+    lambda { IOSpecs.closed_io.read_nonblock(5) }.should raise_error(IOError)
+  end
+
+  it "raises EOFError when the end is reached" do
+    @write << "hello"
+    @write.close
+
+    @read.read_nonblock(5)
+
+    lambda { @read.read_nonblock(5) }.should raise_error(EOFError)
+  end
+end