(df)
| 1347 | |
| 1348 | |
| 1349 | def test_copy(df): |
| 1350 | original = df.copy() |
| 1351 | columns = tuple(original.columns) |
| 1352 | |
| 1353 | df["z"] = df.x + df.y |
| 1354 | |
| 1355 | assert tuple(original.columns) == columns |
| 1356 | assert "z" not in original.columns |
| 1357 | |
| 1358 | |
| 1359 | def test_partitions(pdf, df): |