Failing test

This test will eventually collect a bad port and throw Errno::EADDRINUSE

This problem has been seen in real world testing.

spec/server_spec.rb

@@ -74,6 +74,21 @@ RSpec.describe Capybara::Server do
     end
   end
 
+  def use_port(host, port)
+    server = TCPServer.new(host, port)
+  ensure
+    server&.close
+  end
+
+  it 'should handle that getting available ports fails randomly' do
+    expect {
+      100000.times do |count|
+        port = Capybara::Server.new(Object.new).send(:find_available_port, "0.0.0.0")
+        use_port("0.0.0.0", port)
+      end
+    }.not_to raise_error
+  end
+
   it 'should return its #base_url' do
     app = proc { |_env| [200, {}, ['Hello Server!']] }
     server = described_class.new(app).boot