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diff --git a/test/pleroma/healthcheck_test.exs b/test/pleroma/healthcheck_test.exs
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+++ b/test/pleroma/healthcheck_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.HealthcheckTest do
+  use Pleroma.DataCase
+  alias Pleroma.Healthcheck
+
+  test "system_info/0" do
+    result = Healthcheck.system_info() |> Map.from_struct()
+
+    assert Map.keys(result) == [
+             :active,
+             :healthy,
+             :idle,
+             :job_queue_stats,
+             :memory_used,
+             :pool_size
+           ]
+  end
+
+  describe "check_health/1" do
+    test "pool size equals active connections" do
+      result = Healthcheck.check_health(%Healthcheck{pool_size: 10, active: 10})
+      refute result.healthy
+    end
+
+    test "chech_health/1" do
+      result = Healthcheck.check_health(%Healthcheck{pool_size: 10, active: 9})
+      assert result.healthy
+    end
+  end
+end