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Fix preloading modules in mix test --slowest-modules=N #14811

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Merged
merged 1 commit into from
Oct 5, 2025
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Fix preloading modules in mix test --slowest-modules=N #14811

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9 changes: 8 additions & 1 deletion lib/mix/lib/mix/tasks/test.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -610,7 +610,14 @@ defmodule Mix.Tasks.Test do
# before requiring test_helper.exs so that the configuration is
# available in test_helper.exs
Mix.shell().print_app()
app_start_args = if opts[:slowest], do: ["--preload-modules" | args], else: args

app_start_args =
if opts[:slowest] || opts[:slowest_modules] do
["--preload-modules" | args]
else
args
end

Mix.Task.run("app.start", app_start_args)

# The test helper may change the Mix.shell(), so revert it whenever we raise and after suite
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