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import abc
from collections import OrderedDict
from ..metadata import MetaData, MergeConflictError, merge, enable_merge_strategies
from ...utils import metadata
from ...tests.helper import pytest
from ...io import fits
class OrderedDictSubclass(OrderedDict):
pass
class MetaBaseTest(object):
__metaclass__ = abc.ABCMeta
def test_none(self):
d = self.test_class(*self.args)
assert isinstance(d.meta, OrderedDict)
assert len(d.meta) == 0
@pytest.mark.parametrize(('meta'), ([dict([('a', 1)]),
OrderedDict([('a', 1)]),
OrderedDictSubclass([('a', 1)])]))
def test_mapping_init(self, meta):
d = self.test_class(*self.args, meta=meta)
assert type(d.meta) == type(meta)
assert d.meta['a'] == 1
@pytest.mark.parametrize(('meta'), (["ceci n'est pas un meta", 1.2, [1, 2, 3]]))
def test_non_mapping_init(self, meta):
with pytest.raises(TypeError):
self.test_class(*self.args, meta=meta)
@pytest.mark.parametrize(('meta'), ([dict([('a', 1)]),
OrderedDict([('a', 1)]),
OrderedDictSubclass([('a', 1)])]))
def test_mapping_set(self, meta):
d = self.test_class(*self.args, meta=meta)
assert type(d.meta) == type(meta)
assert d.meta['a'] == 1
@pytest.mark.parametrize(('meta'), (["ceci n'est pas un meta", 1.2, [1, 2, 3]]))
def test_non_mapping_set(self, meta):
with pytest.raises(TypeError):
d = self.test_class(*self.args, meta=meta)
def test_meta_fits_header(self):
header = fits.header.Header()
header.set('observer', 'Edwin Hubble')
header.set('exptime', '3600')
d = self.test_class(*self.args, meta=header)
assert d.meta['OBSERVER'] == 'Edwin Hubble'
class ExampleData(object):
meta = MetaData()
def __init__(self, meta=None):
self.meta = meta
class TestMetaExampleData(MetaBaseTest):
test_class = ExampleData
args = ()
def test_metadata_merging_conflict_exception():
"""Regression test for issue #3294.
Ensure that an exception is raised when a metadata conflict exists
and ``metadata_conflicts='error'`` has been set.
"""
data1 = ExampleData()
data2 = ExampleData()
data1.meta['somekey'] = {'x': 1, 'y': 1}
data2.meta['somekey'] = {'x': 1, 'y': 999}
with pytest.raises(MergeConflictError):
merge(data1.meta, data2.meta, metadata_conflicts='error')
import numpy as np
def test_metadata_merging():
# Recursive merge
meta1 = {'k1': {'k1': [1, 2],
'k2': 2},
'k2': 2,
'k4': (1, 2)}
meta2 = {'k1': {'k1': [3]},
'k3': 3,
'k4': (3,)}
out = merge(meta1, meta2, metadata_conflicts='error')
assert out == {'k1': {'k2': 2,
'k1': [1, 2, 3]},
'k2': 2,
'k3': 3,
'k4': (1, 2, 3)}
# Merge two ndarrays
meta1 = {'k1': np.array([1, 2])}
meta2 = {'k1': np.array([3])}
out = merge(meta1, meta2, metadata_conflicts='error')
assert np.all(out['k1'] == np.array([1, 2, 3]))
# Merge list and np.ndarray
meta1 = {'k1': [1, 2]}
meta2 = {'k1': np.array([3])}
assert np.all(out['k1'] == np.array([1, 2, 3]))
# Can't merge two scalar types
meta1 = {'k1': 1}
meta2 = {'k1': 2}
with pytest.raises(MergeConflictError):
merge(meta1, meta2, metadata_conflicts='error')
# Conflicting shape
meta1 = {'k1': np.array([1, 2])}
meta2 = {'k1': np.array([[3]])}
with pytest.raises(MergeConflictError):
merge(meta1, meta2, metadata_conflicts='error')
# Conflicting array type
meta1 = {'k1': np.array([1, 2])}
meta2 = {'k1': np.array(['3'])}
with pytest.raises(MergeConflictError):
merge(meta1, meta2, metadata_conflicts='error')
# Conflicting array type with 'silent' merging
meta1 = {'k1': np.array([1, 2])}
meta2 = {'k1': np.array(['3'])}
out = merge(meta1, meta2, metadata_conflicts='silent')
assert np.all(out['k1'] == np.array(['3']))
def test_metadata_merging_new_strategy():
original_merge_strategies = list(metadata.MERGE_STRATEGIES)
class MergeNumbersAsList(metadata.MergeStrategy):
"""
Scalar float or int values are joined in a list.
"""
types = ((int, float), (int, float))
@classmethod
def merge(cls, left, right):
return [left, right]
class MergeConcatStrings(metadata.MergePlus):
"""
Scalar string values are concatenated
"""
types = (str, str)
enabled = False
# Normally can't merge two scalar types
meta1 = {'k1': 1, 'k2': 'a'}
meta2 = {'k1': 2, 'k2': 'b'}
# Enable new merge strategy
with enable_merge_strategies(MergeNumbersAsList, MergeConcatStrings):
assert MergeNumbersAsList.enabled
assert MergeConcatStrings.enabled
out = merge(meta1, meta2, metadata_conflicts='error')
assert out['k1'] == [1, 2]
assert out['k2'] == 'ab'
assert not MergeNumbersAsList.enabled
assert not MergeConcatStrings.enabled
# Confirm the default enabled=False behavior
with pytest.raises(MergeConflictError):
merge(meta1, meta2, metadata_conflicts='error')
# Enable all MergeStrategy subclasses
with enable_merge_strategies(metadata.MergeStrategy):
assert MergeNumbersAsList.enabled
assert MergeConcatStrings.enabled
out = merge(meta1, meta2, metadata_conflicts='error')
assert out['k1'] == [1, 2]
assert out['k2'] == 'ab'
assert not MergeNumbersAsList.enabled
assert not MergeConcatStrings.enabled
metadata.MERGE_STRATEGIES = original_merge_strategies
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