pydata__xarray-5131

Now I have the relevant code. The issue is clear:

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Content

Now I have the relevant code. The issue is clear:

1. In `groupby.py` line 439, the `__repr__` method has a trailing space before `\n`:
   ```python
   return "{}, grouped over {!r} \n{!r} groups with labels {}.".format(
   ```
   The space after `{!r}` and before `\n` is causing the trailing whitespace.

2. The tests in `test_groupby.py` also have the trailing space to match the current (incorrect) output:
   - Line 394: `expected += ", grouped over %r " % dim`
   - Line 408: `expected += ", grouped over 'month' "`

Let me generate the patch to fix this:

--- a/xarray/core/groupby.py
+++ b/xa

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