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diff --git a/deps/rabbitmq_cli/test/diagnostics/observer_command_test.exs b/deps/rabbitmq_cli/test/diagnostics/observer_command_test.exs
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+++ b/deps/rabbitmq_cli/test/diagnostics/observer_command_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 ObserverCommandTest do
+  use ExUnit.Case, async: false
+  import TestHelper
+
+  @command RabbitMQ.CLI.Diagnostics.Commands.ObserverCommand
+
+  setup_all do
+    RabbitMQ.CLI.Core.Distribution.start()
+
+    :ok
+  end
+
+  setup context do
+    {:ok, opts: %{
+        node: get_rabbit_hostname(),
+        interval: 5,
+        timeout: context[:test_timeout] || 15000
+      }}
+  end
+
+  test "merge_defaults: injects a default interval of 5s" do
+    assert @command.merge_defaults([], %{}) == {[], %{interval: 5}}
+  end
+
+  test "validate: treats positional arguments as a failure" do
+    assert @command.validate(["extra-arg"], %{}) == {:validation_failure, :too_many_args}
+  end
+
+  test "validate: treats empty positional arguments and default switches as a success" do
+    assert @command.validate([], %{}) == :ok
+  end
+
+  @tag test_timeout: 3000
+  test "run: targeting an unreachable node throws a badrpc" do
+    assert match?({:badrpc, _}, @command.run([], %{node: :jake@thedog, interval: 5}))
+  end
+end