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Clarify the need for mix_stderr in when accessing the output of stderr in tests #1045

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2 changes: 1 addition & 1 deletion docs/tutorial/testing.md
Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,7 @@ Then we check that the text printed to "standard output" contains the text that

/// tip

You could also check `result.stderr` for "standard error" independently from "standard output" if your `CliRunner` instance is created with the `mix_stderr=False` argument.
**Checking for output sent to standard error?** Make sure your `CliRunner` instance is created with the `mix_stderr=False` argument. You need this to be able to access `result.stderr` in tests.

///

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