Clarify test case

Author: githeap

pandas/tests/io/parser/test_common.py

@@ -1875,7 +1875,8 @@ def test_infinity_parsing(all_parsers, na_filter):
 c,+Infinity
 """
     expected = DataFrame(
-        {"A": [float("inf"), float("-inf"), float("inf")]}, index=["a", "b", "c"]
+        {"A": [float("infinity"), float("-infinity"), float("+infinity")]},
+        index=["a", "b", "c"],
     )
     result = parser.read_csv(StringIO(data), index_col=0, na_filter=na_filter)
     tm.assert_frame_equal(result, expected)