Add Tempfile test which can trigger EAGAIN on blocking write.

gems.rb

@@ -11,7 +11,7 @@
 	gem "bake-gem"
 	gem "bake-modernize"
 
-	gem "utopia-project"#, path: '../utopia-project'
+	gem "utopia-project"
 end
 
 # gem "async-rspec", path: "../async-rspec"

spec/tempfile_spec.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+# Copyright, 2022, by Samuel G. D. Williams. <http://www.codeotaku.com>
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+require 'tempfile'
+
+RSpec.describe Tempfile do
+	it "should be able to read and write" do
+		Sync do
+			1_000_000.times{subject.write("Hello World!")}
+			subject.flush
+
+			subject.seek(0)
+
+			expect(subject.read(12)).to be == "Hello World!"
+		end
+	end
+end