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diff --git a/deps/rabbitmq_cli/test/ctl/join_cluster_command_test.exs b/deps/rabbitmq_cli/test/ctl/join_cluster_command_test.exs
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+++ b/deps/rabbitmq_cli/test/ctl/join_cluster_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) 2016-2020 VMware, Inc. or its affiliates.  All rights reserved.
+
+
+defmodule JoinClusterCommandTest do
+  use ExUnit.Case, async: false
+  import TestHelper
+
+  @command RabbitMQ.CLI.Ctl.Commands.JoinClusterCommand
+
+  setup_all do
+    RabbitMQ.CLI.Core.Distribution.start()
+
+    start_rabbitmq_app()
+
+    on_exit([], fn ->
+      start_rabbitmq_app()
+    end)
+
+    :ok
+  end
+
+  setup do
+    {:ok, opts: %{
+      node: get_rabbit_hostname(),
+      disc: true,
+      ram: false,
+    }}
+  end
+
+  test "validate: specifying both --disc and --ram is reported as invalid", context do
+    assert match?(
+      {:validation_failure, {:bad_argument, _}},
+      @command.validate(["a"], Map.merge(context[:opts], %{disc: true, ram: true}))
+    )
+  end
+  test "validate: specifying no target node is reported as an error", context do
+    assert @command.validate([], context[:opts]) ==
+      {:validation_failure, :not_enough_args}
+  end
+  test "validate: specifying multiple target nodes is reported as an error", context do
+    assert @command.validate(["a", "b", "c"], context[:opts]) ==
+      {:validation_failure, :too_many_args}
+  end
+
+  # TODO
+  #test "run: successful join as a disc node", context do
+  #end
+
+  # TODO
+  #test "run: successful join as a RAM node", context do
+  #end
+
+  test "run: joining self is invalid", context do
+    stop_rabbitmq_app()
+    assert match?(
+      {:error, :cannot_cluster_node_with_itself},
+      @command.run([context[:opts][:node]], context[:opts]))
+    start_rabbitmq_app()
+  end
+
+  # TODO
+  test "run: request to an active node fails", context do
+   assert match?(
+     {:error, :mnesia_unexpectedly_running},
+    @command.run([context[:opts][:node]], context[:opts]))
+  end
+
+  test "run: request to a non-existent node returns a badrpc", context do
+    opts = %{
+      node: :jake@thedog,
+      disc: true,
+      ram: false,
+      timeout: 200
+    }
+    assert match?(
+      {:badrpc, _},
+      @command.run([context[:opts][:node]], opts))
+  end
+
+  test "run: joining a non-existent node returns a badrpc", context do
+    stop_rabbitmq_app()
+    assert match?(
+      {:badrpc_multi, _, [_]},
+      @command.run([:jake@thedog], context[:opts]))
+    start_rabbitmq_app()
+  end
+
+  test "banner", context do
+    assert @command.banner(["a"], context[:opts]) =~
+      ~r/Clustering node #{get_rabbit_hostname()} with a/
+  end
+
+  test "output mnesia is running error", context do
+    exit_code = RabbitMQ.CLI.Core.ExitCodes.exit_software
+    assert match?({:error, ^exit_code,
+                   "Mnesia is still running on node " <> _},
+                   @command.output({:error, :mnesia_unexpectedly_running}, context[:opts]))
+
+  end
+end