1 files changed, 32 insertions, 0 deletions
diff --git a/spec/lib/gitlab/tcp_checker_spec.rb b/spec/lib/gitlab/tcp_checker_spec.rb
new file mode 100644
index 00000000000..4acf0334496
--- /dev/null
+++ b/spec/lib/gitlab/tcp_checker_spec.rb
@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe Gitlab::TcpChecker do
+  before do
+    @server = TCPServer.new('localhost', 0)
+    _, @port, _, @ip = @server.addr
+  end
+
+  after do
+    @server.close
+  end
+
+  subject(:checker) { described_class.new(@ip, @port) }
+
+  describe '#check' do
+    subject { checker.check }
+
+    it 'can connect to an open port' do
+      is_expected.to be_truthy
+
+      expect(checker.error).to be_nil
+    end
+
+    it 'fails to connect to a closed port' do
+      @server.close
+
+      is_expected.to be_falsy
+
+      expect(checker.error).to be_a(Errno::ECONNREFUSED)
+    end
+  end
+end