BUG: Fix typos in test method names (#62197)

Author: brchristian

pandas/tests/groupby/test_libgroupby.py

@@ -285,7 +285,7 @@ def test_cython_group_mean_not_datetimelike_but_has_NaT_values():
     )
 
 
-def test_cython_group_mean_Inf_at_begining_and_end():
+def test_cython_group_mean_Inf_at_beginning_and_end():
     # GH 50367
     actual = np.array([[np.nan, np.nan], [np.nan, np.nan]], dtype="float64")
     counts = np.array([0, 0], dtype="int64")
@@ -314,7 +314,7 @@ def test_cython_group_mean_Inf_at_begining_and_end():
         ([[np.inf], [-np.inf], [-np.inf]], [[np.inf], [-np.inf]]),
     ],
 )
-def test_cython_group_sum_Inf_at_begining_and_end(values, out):
+def test_cython_group_sum_Inf_at_beginning_and_end(values, out):
     # GH #53606
     actual = np.array([[np.nan], [np.nan]], dtype="float64")
     counts = np.array([0, 0], dtype="int64")

pandas/tests/reshape/test_from_dummies.py

@@ -100,7 +100,7 @@ def test_error_contains_non_dummies():
         from_dummies(dummies)
 
 
-def test_error_with_prefix_multiple_seperators():
+def test_error_with_prefix_multiple_separators():
     dummies = DataFrame(
         {
             "col1_a": [1, 0, 1],