Add more Mix task tests in relay_test.exs and uploads_test.exs.

Rename test/tasks/user.exs to test/tasks/user_test.exs.

test/tasks/uploads_test.exs

@@ -0,0 +1,47 @@
+defmodule Mix.Tasks.Pleroma.UploadsTest do
+  alias Pleroma.Upload
+  use Pleroma.DataCase
+
+  import Mock
+
+  setup_all do
+    Mix.shell(Mix.Shell.Process)
+
+    on_exit(fn ->
+      Mix.shell(Mix.Shell.IO)
+    end)
+
+    :ok
+  end
+
+  describe "running migrate_local" do
+    test "uploads migrated" do
+      with_mock Upload,
+        store: fn %Upload{name: _file, path: _path}, _opts -> {:ok, %{}} end do
+        Mix.Tasks.Pleroma.Uploads.run(["migrate_local", "S3"])
+
+        assert_received {:mix_shell, :info, [message]}
+        assert message =~ "Migrating files from local"
+
+        assert_received {:mix_shell, :info, [message]}
+
+        assert %{"total_count" => total_count} =
+                 Regex.named_captures(~r"^Found (?<total_count>\d+) uploads$", message)
+
+        assert_received {:mix_shell, :info, [message]}
+
+        assert %{"count" => ^total_count, "total_count" => ^total_count} =
+                 Regex.named_captures(
+                   ~r"^Uploaded (?<count>\d+)/(?<total_count>\d+) files$",
+                   message
+                 )
+      end
+    end
+
+    test "nonexistent uploader" do
+      assert_raise RuntimeError, ~r/The uploader .* is not an existing/, fn ->
+        Mix.Tasks.Pleroma.Uploads.run(["migrate_local", "nonexistent"])
+      end
+    end
+  end
+end