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diff --git a/test/mix/tasks/pleroma/instance_test.exs b/test/mix/tasks/pleroma/instance_test.exs
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+++ b/test/mix/tasks/pleroma/instance_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 Mix.Tasks.Pleroma.InstanceTest do
+  use ExUnit.Case
+
+  setup do
+    File.mkdir_p!(tmp_path())
+
+    on_exit(fn ->
+      File.rm_rf(tmp_path())
+      static_dir = Pleroma.Config.get([:instance, :static_dir], "test/instance_static/")
+
+      if File.exists?(static_dir) do
+        File.rm_rf(Path.join(static_dir, "robots.txt"))
+      end
+
+      Pleroma.Config.put([:instance, :static_dir], static_dir)
+    end)
+
+    :ok
+  end
+
+  defp tmp_path do
+    "/tmp/generated_files/"
+  end
+
+  test "running gen" do
+    mix_task = fn ->
+      Mix.Tasks.Pleroma.Instance.run([
+        "gen",
+        "--output",
+        tmp_path() <> "generated_config.exs",
+        "--output-psql",
+        tmp_path() <> "setup.psql",
+        "--domain",
+        "test.pleroma.social",
+        "--instance-name",
+        "Pleroma",
+        "--admin-email",
+        "admin@example.com",
+        "--notify-email",
+        "notify@example.com",
+        "--dbhost",
+        "dbhost",
+        "--dbname",
+        "dbname",
+        "--dbuser",
+        "dbuser",
+        "--dbpass",
+        "dbpass",
+        "--indexable",
+        "y",
+        "--db-configurable",
+        "y",
+        "--rum",
+        "y",
+        "--listen-port",
+        "4000",
+        "--listen-ip",
+        "127.0.0.1",
+        "--uploads-dir",
+        "test/uploads",
+        "--static-dir",
+        "./test/../test/instance/static/",
+        "--strip-uploads",
+        "y",
+        "--dedupe-uploads",
+        "n",
+        "--anonymize-uploads",
+        "n"
+      ])
+    end
+
+    ExUnit.CaptureIO.capture_io(fn ->
+      mix_task.()
+    end)
+
+    generated_config = File.read!(tmp_path() <> "generated_config.exs")
+    assert generated_config =~ "host: \"test.pleroma.social\""
+    assert generated_config =~ "name: \"Pleroma\""
+    assert generated_config =~ "email: \"admin@example.com\""
+    assert generated_config =~ "notify_email: \"notify@example.com\""
+    assert generated_config =~ "hostname: \"dbhost\""
+    assert generated_config =~ "database: \"dbname\""
+    assert generated_config =~ "username: \"dbuser\""
+    assert generated_config =~ "password: \"dbpass\""
+    assert generated_config =~ "configurable_from_database: true"
+    assert generated_config =~ "http: [ip: {127, 0, 0, 1}, port: 4000]"
+    assert generated_config =~ "filters: [Pleroma.Upload.Filter.ExifTool]"
+    assert File.read!(tmp_path() <> "setup.psql") == generated_setup_psql()
+    assert File.exists?(Path.expand("./test/instance/static/robots.txt"))
+  end
+
+  defp generated_setup_psql do
+    ~s(CREATE USER dbuser WITH ENCRYPTED PASSWORD 'dbpass';\nCREATE DATABASE dbname OWNER dbuser;\n\\c dbname;\n--Extensions made by ecto.migrate that need superuser access\nCREATE EXTENSION IF NOT EXISTS citext;\nCREATE EXTENSION IF NOT EXISTS pg_trgm;\nCREATE EXTENSION IF NOT EXISTS \"uuid-ossp\";\nCREATE EXTENSION IF NOT EXISTS rum;\n)
+  end
+end