Eliminate warnings from test suite

.travis.yml

@@ -71,6 +71,9 @@ matrix:
     # Test against an installed asdf package
     - env: TOXENV=packaged
 
+    # Test with warnings converted to errors
+    - env: TOXENV=warnings
+
     # Test on OS X
     - env:
         - TOXENV=py38
@@ -102,6 +105,8 @@ matrix:
 
     - env: TOXENV=py38-numpydev
 
+    - env: TOXENV=warnings
+
 install: pip install tox
 
 script: tox

CHANGES.rst

@@ -9,6 +9,9 @@
 
 - Fix bugs and code style found by adding F and W ``flake8`` checks. [#797]
 
+- Eliminate warnings in pytest plugin by using ``from_parent``
+  when available. [#799]
+
 2.6.1 (unreleased)
 ------------------
 

asdf/commands/tests/test_info.py

@@ -1,5 +1,7 @@
 from functools import partial
 
+import pytest
+
 from ...tests import helpers
 from . import data as test_data
 
@@ -9,6 +11,10 @@
 get_test_data_path = partial(helpers.get_test_data_path, module=test_data)
 
 
+# The test file we're using here contains objects whose schemas
+# have been dropped from the ASDF Standard.  We should select
+# a new file once the locations of schemas are more stable.
+@pytest.mark.filterwarnings("ignore::asdf.exceptions.AsdfConversionWarning")
 def test_info_command(capsys):
     file_path = get_test_data_path("frames0.asdf")
 

asdf/tests/helpers.py

@@ -416,7 +416,7 @@ def _assert_extension_type_correctness(extension, extension_type, resolver):
 
         try:
             with generic_io.get_file(schema_location) as f:
-                schema = yaml.load(f.read())
+                schema = yaml.safe_load(f.read())
         except Exception:
             assert False, (
                 "{} supports tag, {}, ".format(extension_type.__name__, check_type.yaml_tag) +

pytest_asdf/plugin.py

@@ -38,19 +38,24 @@ def pytest_addoption(parser):
 
 
 class AsdfSchemaFile(pytest.File):
+    @classmethod
+    def from_parent(cls, parent, *, fspath, skip_examples=False, ignore_unrecognized_tag=False, **kwargs):
+        if hasattr(super(), "from_parent"):
+            result = super().from_parent(parent, fspath=fspath, **kwargs)
+        else:
+            result = AsdfSchemaFile(fspath, parent, **kwargs)
 
-    def __init__(self, *args, skip_examples=False, ignore_unrecognized_tag=False, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.skip_examples = skip_examples
-        self.ignore_unrecognized_tag = ignore_unrecognized_tag
+        result.skip_examples = skip_examples
+        result.ignore_unrecognized_tag = ignore_unrecognized_tag
+        return result
 
     def collect(self):
-        yield AsdfSchemaItem(str(self.fspath), self)
+        yield AsdfSchemaItem.from_parent(self, self.fspath)
         if not self.skip_examples:
             for example in self.find_examples_in_schema():
-                yield AsdfSchemaExampleItem(
-                    str(self.fspath),
+                yield AsdfSchemaExampleItem.from_parent(
                     self,
+                    self.fspath,
                     example,
                     ignore_unrecognized_tag=self.ignore_unrecognized_tag
                 )
@@ -71,9 +76,15 @@ def find_examples_in_schema(self):
 
 
 class AsdfSchemaItem(pytest.Item):
-    def __init__(self, schema_path, parent):
-        super(AsdfSchemaItem, self).__init__(schema_path, parent)
-        self.schema_path = schema_path
+    @classmethod
+    def from_parent(cls, parent, schema_path, **kwargs):
+        if hasattr(super(), "from_parent"):
+            result = super().from_parent(parent, name=str(schema_path), **kwargs)
+        else:
+            result = AsdfSchemaItem(str(schema_path), parent, **kwargs)
+
+        result.schema_path = schema_path
+        return result
 
     def runtest(self):
         from asdf import schema
@@ -122,12 +133,17 @@ def parse_schema_filename(filename):
 
 
 class AsdfSchemaExampleItem(pytest.Item):
-    def __init__(self, schema_path, parent, example, ignore_unrecognized_tag=False):
+    @classmethod
+    def from_parent(cls, parent, schema_path, example, ignore_unrecognized_tag=False, **kwargs):
         test_name = "{}-example".format(schema_path)
-        super(AsdfSchemaExampleItem, self).__init__(test_name, parent)
-        self.filename = str(schema_path)
-        self.example = example
-        self.ignore_unrecognized_tag = ignore_unrecognized_tag
+        if hasattr(super(), "from_parent"):
+            result = super().from_parent(parent, name=test_name, **kwargs)
+        else:
+            result = AsdfSchemaExampleItem(test_name, parent, **kwargs)
+        result.filename = str(schema_path)
+        result.example = example
+        result.ignore_unrecognized_tag = ignore_unrecognized_tag
+        return result
 
     def _find_standard_version(self, name, version):
         from asdf import versioning
@@ -211,9 +227,9 @@ def pytest_collect_file(path, parent):
 
     for root in schema_roots:
         if str(path).startswith(root) and path.purebasename not in skip_names:
-            return AsdfSchemaFile(
-                path,
+            return AsdfSchemaFile.from_parent(
                 parent,
+                fspath=path,
                 skip_examples=(path.purebasename in skip_examples),
                 ignore_unrecognized_tag=ignore_unrecognized_tag,
             )

setup.cfg

@@ -80,6 +80,10 @@ norecursedirs = build docs/_build
 doctest_plus = enabled
 remote_data_strict = True
 open_files_ignore = test.fits asdf.fits
+# The asdf.asdftypes module emits a warning on import,
+# which pytest trips over during collection:
+filterwarnings =
+    ignore::asdf.exceptions.AsdfDeprecationWarning:asdf.asdftypes
 # Configuration for pytest-doctestplus
 text_file_format = rst
 # Account for both the astropy test runner case and the native pytest case

tox.ini

@@ -24,6 +24,8 @@ deps=
     numpy12: numpy==1.12
     numpydev,astrodev,s390x: cython
 extras= all,tests
+# astropy will complain if the home directory is missing
+passenv= HOME
 commands=
     pytest --remote-data
 
@@ -37,6 +39,11 @@ install_command= python -m pip install --no-cache-dir {opts} {packages}
 basepython= python3.8
 pip_pre= true
 
+[testenv:warnings]
+basepython= python3.8
+commands=
+    pytest --remote-data -W error -W ignore::asdf.exceptions.AsdfDeprecationWarning:asdf.asdftypes
+
 [testenv:packaged]
 basepython= python3.8
 # The default tox working directory is in .tox in the source directory.  If we