def test_dataframe_append_to_empty():
pdf = pd.DataFrame()
pdf['a'] = []
pdf['b'] = [1, 2, 3]
gdf = DataFrame()
gdf['a'] = []
gdf['b'] = [1, 2, 3]
pd.testing.assert_frame_equal(gdf.to_pandas(), pdf)
def test_dataframe_masked_slicing(nelem, slice_start, slice_end):
gdf = DataFrame()
gdf['a'] = list(range(nelem))
gdf['b'] = list(range(nelem, 2 * nelem))
gdf['a'] = gdf['a'].set_mask(utils.random_bitmask(nelem))
gdf['b'] = gdf['b'].set_mask(utils.random_bitmask(nelem))
def do_slice(x):
return x[slice_start:slice_end]
expect = do_slice(gdf.to_pandas())
got = do_slice(gdf).to_pandas()
pd.testing.assert_frame_equal(expect, got)
