pkg resources

requirements/test.txt

@@ -4,3 +4,4 @@ codecov
 coverage
 pytest-cov
 pytest-env
+sympy

tests/__init__.py

@@ -1,85 +0,0 @@
-#!/usr/bin/env python
-##############################################################################
-#
-# diffpy.srfit      by DANSE Diffraction group
-#                   Simon J. L. Billinge
-#                   (c) 2010 The Trustees of Columbia University
-#                   in the City of New York.  All rights reserved.
-#
-# File coded by:    Pavol Juhas
-#
-# See AUTHORS.txt for a list of people who contributed.
-# See LICENSE_DANSE.txt for license information.
-#
-##############################################################################
-"""Unit tests for diffpy.srfit."""
-
-import logging
-import unittest
-
-# create logger instance for the tests subpackage
-logging.basicConfig()
-logger = logging.getLogger(__name__)
-del logging
-
-
-def testsuite(pattern=""):
-    """Create a unit tests suite for diffpy.srfit package.
-
-    Parameters
-    ----------
-    pattern : str, optional
-        Regular expression pattern for selecting test cases.
-        Select all tests when empty.  Ignore the pattern when
-        any of unit test modules fails to import.
-
-    Returns
-    -------
-    suite : `unittest.TestSuite`
-        The TestSuite object containing the matching tests.
-    """
-    import re
-    from itertools import chain
-    from os.path import dirname
-
-    from pkg_resources import resource_filename
-
-    loader = unittest.defaultTestLoader
-    thisdir = resource_filename(__name__, "")
-    depth = __name__.count(".") + 1
-    topdir = thisdir
-    for i in range(depth):
-        topdir = dirname(topdir)
-    suite_all = loader.discover(thisdir, top_level_dir=topdir)
-    # always filter the suite by pattern to test-cover the selection code.
-    suite = unittest.TestSuite()
-    rx = re.compile(pattern)
-    tsuites = list(chain.from_iterable(suite_all))
-    tsok = all(isinstance(ts, unittest.TestSuite) for ts in tsuites)
-    if not tsok:  # pragma: no cover
-        return suite_all
-    tcases = chain.from_iterable(tsuites)
-    for tc in tcases:
-        tcwords = tc.id().split(".")
-        shortname = ".".join(tcwords[-3:])
-        if rx.search(shortname):
-            suite.addTest(tc)
-    # verify all tests are found for an empty pattern.
-    assert pattern or suite_all.countTestCases() == suite.countTestCases()
-    return suite
-
-
-def test():
-    """Execute all unit tests for the diffpy.srfit package.
-
-    Returns
-    -------
-    result : `unittest.TestResult`
-    """
-    suite = testsuite()
-    runner = unittest.TextTestRunner()
-    result = runner.run(suite)
-    return result
-
-
-# End of file

tests/conftest.py

@@ -1,10 +1,92 @@
+import importlib.resources
 import json
+import logging
+import sys
+from functools import lru_cache
 from pathlib import Path
 
 import pytest
+import six
 
+import diffpy.srfit.equation.literals as literals
+from diffpy.srfit.sas.sasimport import sasimport
 
-@pytest.fixture
+logger = logging.getLogger(__name__)
+
+
+@lru_cache()
+def has_sas():
+    try:
+        sasimport("sas.pr.invertor")
+        sasimport("sas.models")
+        return True
+    except ImportError:
+        return False
+
+
+# diffpy.structure
+@lru_cache()
+def has_diffpy_structure():
+    try:
+        import diffpy.structure as m
+
+        del m
+        return True
+    except ImportError:
+        return False
+        logger.warning(
+            "Cannot import diffpy.structure, Structure tests skipped."
+        )
+
+
+@lru_cache()
+def has_pyobjcryst():
+    try:
+        import pyobjcryst as m
+
+        del m
+        return True
+    except ImportError:
+        return False
+        logger.warning("Cannot import pyobjcryst, pyobjcryst tests skipped.")
+
+
+# diffpy.srreal
+
+
+@lru_cache()
+def has_diffpy_srreal():
+    try:
+        import diffpy.srreal.pdfcalculator as m
+
+        del m
+        return True
+    except ImportError:
+        return False
+        logger.warning("Cannot import diffpy.srreal, PDF tests skipped.")
+
+
+@pytest.fixture(scope="session")
+def sas_available():
+    return has_sas()
+
+
+@pytest.fixture(scope="session")
+def diffpy_structure_available():
+    return has_diffpy_structure()
+
+
+@pytest.fixture(scope="session")
+def diffpy_srreal_available():
+    return has_diffpy_srreal()
+
+
+@pytest.fixture(scope="session")
+def pyobjcryst_available():
+    return has_pyobjcryst()
+
+
+@pytest.fixture(scope="session")
 def user_filesystem(tmp_path):
     base_dir = Path(tmp_path)
     home_dir = base_dir / "home_dir"
@@ -17,3 +99,61 @@
         json.dump(home_config_data, f)
 
     yield tmp_path
+
+
+@pytest.fixture(scope="session")
+def datafile():
+    """Fixture to load a test data file from the testdata package directory."""
+
+    def _datafile(filename):
+        return importlib.resources.files("tests.testdata").joinpath(filename)
+
+    return _datafile
+
+
+@pytest.fixture(scope="session")
+def make_args():
+    def _makeArgs(num):
+        args = []
+        for i in range(num):
+            j = i + 1
+            args.append(literals.Argument(name="v%i" % j, value=j))
+        return args
+
+    return _makeArgs
+
+
+@pytest.fixture(scope="session")
+def noObserversInGlobalBuilders():
+    def _noObserversInGlobalBuilders():
+        """True if no observer function leaks to global builder objects.
+
+        Ensure objects are not immortal due to a reference from static
+        value.
+        """
+        from diffpy.srfit.equation.builder import _builders
+
+        rv = True
+        for n, b in _builders.items():
+            if b.literal and b.literal._observers:
+                rv = False
+                break
+        return rv
+
+    return _noObserversInGlobalBuilders()
+
+
+@pytest.fixture(scope="session")
+def capturestdout():
+    def _capturestdout(f, *args, **kwargs):
+        """Capture the standard output from a call of function f."""
+        savestdout = sys.stdout
+        fp = six.StringIO()
+        try:
+            sys.stdout = fp
+            f(*args, **kwargs)
+        finally:
+            sys.stdout = savestdout
+        return fp.getvalue()
+
+    return _capturestdout