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diff --git a/deps/rabbitmq_cli/test/core/os_pid_test.exs b/deps/rabbitmq_cli/test/core/os_pid_test.exs
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+## This Source Code Form is subject to the terms of the Mozilla Public
+## License, v. 2.0. If a copy of the MPL was not distributed with this
+## file, You can obtain one at https://mozilla.org/MPL/2.0/.
+##
+## Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
+
+
+defmodule OsPidTest do
+  use ExUnit.Case, async: false
+  import TestHelper
+
+  @subject RabbitMQ.CLI.Core.OsPid
+
+  #
+  # Tests
+  #
+
+  describe "#read_pid_from_file with should_wait = false" do
+    test "with a valid pid file returns an integer value" do
+      path = fixture_file_path("valid_pidfile.pid")
+
+      assert (File.exists?(path) and File.regular?(path))
+      assert @subject.read_pid_from_file(path, false) == 13566
+    end
+
+    test "with a valid pid file that includes spaces returns an integer value" do
+      path = fixture_file_path("valid_pidfile_with_spaces.pid")
+
+      assert (File.exists?(path) and File.regular?(path))
+      assert @subject.read_pid_from_file(path, false) == 83777
+    end
+
+    test "with an empty file" do
+      path = fixture_file_path("empty_pidfile.pid")
+
+      assert (File.exists?(path) and File.regular?(path))
+      assert match?({:error, :could_not_read_pid_from_file, _}, @subject.read_pid_from_file(path, false))
+    end
+
+    test "with a non-empty file full of garbage (that doesn't parse)" do
+      path = fixture_file_path("invalid_pidfile.pid")
+
+      assert (File.exists?(path) and File.regular?(path))
+      assert match?({:error, :could_not_read_pid_from_file, _}, @subject.read_pid_from_file(path, false))
+    end
+
+    test "with a file that does not exist" do
+      path = fixture_file_path("pidfile_that_does_not_exist_128787df8s7f8%4&^.pid")
+
+      assert !File.exists?(path)
+      assert match?({:error, :could_not_read_pid_from_file, _}, @subject.read_pid_from_file(path, false))
+    end
+  end
+end