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"""
Helpers for writing unit tests of ASDF support.
"""
from io import BytesIO
import asdf
def roundtrip_object(obj, version=None):
"""
Add the specified object to an AsdfFile's tree, write the file to
a buffer, then read it back in and return the deserialized object.
Parameters
----------
obj : object
Object to serialize.
version : str or None.
ASDF Standard version. If None, use the library's default version.
Returns
-------
object
The deserialized object.
"""
buff = BytesIO()
with asdf.AsdfFile(version=version) as af:
af["obj"] = obj
af.write_to(buff)
buff.seek(0)
with asdf.open(buff, lazy_load=False, copy_arrays=True) as af:
return af["obj"]
def yaml_to_asdf(yaml_content, version=None):
"""
Given a string of YAML content, adds the extra pre-
and post-amble to make it an ASDF file.
Parameters
----------
yaml_content : string or bytes
YAML content.
version : str or None.
ASDF Standard version. If None, use the library's default version.
Returns
-------
io.BytesIO
A file-like object containing the ASDF file.
"""
if isinstance(yaml_content, str):
yaml_content = yaml_content.encode("utf-8")
buff = BytesIO()
with asdf.AsdfFile(version=version) as af:
af["$REPLACE"] = "ME"
af.write_to(buff)
buff.seek(0)
asdf_content = buff.read().replace(b"$REPLACE: ME", yaml_content)
return BytesIO(asdf_content)
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