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Add warning to stub/3 #169

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Merged
josevalim merged 3 commits into from
Nov 6, 2025
Merged

Add warning to stub/3 #169

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3bb1d91
Add warning to stub/3
Nov 5, 2025
5f6f734
Update lib/mox.ex
josevalim Nov 6, 2025
ac5fdf7
Update lib/mox.ex
josevalim Nov 6, 2025
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10 changes: 10 additions & 0 deletions lib/mox.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -597,6 +597,16 @@ defmodule Mox do
stub(MockWeatherAPI, :get_temp, fn _loc -> {:ok, 30} end)

`stub/3` will overwrite any previous calls to `stub/3`.

> #### Warning {: .warning}
>
> `stub/3` does **not verify that a call occurred**.
> If the code stops calling the stubbed function
> (for example, after a refactor), the test will still pass.
>
> This can lead to unused stubs lingering in tests.
> Always use `expect/3` when you want to ensure the
> function is actually invoked.
"""
@spec stub(mock, atom(), function()) :: mock when mock: t()
def stub(mock, name, code)
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