Add failing test case.

test/io/event/selector.rb

@@ -558,7 +558,7 @@ def transfer
 			end
 
 			expect(events).to be == [:process_finished]
-			expect(result.success?).to be == true
+			expect(result).to be(:success?)
 		end
 
 		it "can wait for a process to terminate" do
@@ -581,6 +581,35 @@ def transfer
 			expect(events).to be == [:process_finished]
 			expect(result).to be(:success?)
 		end
+
+		it "can wait for a process which never starts" do
+			# No fork.
+			skip_if_ruby_platform(/mswin/)
+
+			result = nil
+			events = []
+
+			fiber = Fiber.new do
+				pid = ::Process.fork do
+					Fiber.blocking do
+						exit(-1)
+					end
+				end
+
+				result = selector.process_wait(Fiber.current, pid, 0)
+				expect(result).not.to be(:success?)
+				events << :process_finished
+			end
+
+			fiber.transfer
+
+			while fiber.alive?
+				selector.select(1)
+			end
+
+			expect(events).to be == [:process_finished]
+			expect(result).not.to be(:success?)
+		end
 	end
 
 	with "#resume" do