def test_calculated_columns():
col = NamedCollection(*BASIC_DATA)
col.add_calculated_column("d", "{a} + {b}")
assert col[0]['d'] == 3
col = NamedCollection(*BASIC_DATA, calculated_columns=(('d', '{a} + {b}',),))
assert col[1]['d'] == 9
def test_filter():
col = NamedCollection(*BASIC_DATA)
col.filter(lambda x: x['a'] < 2)
assert len(col) == 1
col = NamedCollection(*BASIC_DATA, filter=(lambda x: x['a'] < 2,))
assert len(col) == 1
def test_formatted_columns():
names, data = STRING_DATA
col = NamedCollection(names, data)
col.add_formatted_column('d', '{c} {a} {b}')
assert list(col)[0]['d'] == 'baz foo bar'
assert len(col.names) == 4
col = NamedCollection(names, data,
formatted_columns=(('d', '{c} {b} {a}'),))
assert list(col)[0]['d'] == 'baz bar foo'
def test_group():
col_ref = NamedCollection(*GROUP_DATA)
col1 = NamedCollection(*GROUP_DATA)
col1.group(['a'])
col2 = NamedCollection(*GROUP_DATA, group=['a'])
for col in [col1, col2]:
assert len(col) == 2
assert col[0]['a'] == 1
assert col[1]['a'] == 2
assert len(col[0].children) == 3
assert type(col) == type(col[0].children)
assert set(col[0].children) <= set(col_ref)
for row in col:
assert len(row) == 2