1 files changed, 94 insertions, 0 deletions
diff --git a/lib/spack/external/_pytest/warnings.py b/lib/spack/external/_pytest/warnings.py
new file mode 100644
index 0000000000..926b1f5811
--- /dev/null
+++ b/lib/spack/external/_pytest/warnings.py
@@ -0,0 +1,94 @@
+from __future__ import absolute_import, division, print_function
+
+import warnings
+from contextlib import contextmanager
+
+import pytest
+
+from _pytest import compat
+
+
+def _setoption(wmod, arg):
+    """
+    Copy of the warning._setoption function but does not escape arguments.
+    """
+    parts = arg.split(':')
+    if len(parts) > 5:
+        raise wmod._OptionError("too many fields (max 5): %r" % (arg,))
+    while len(parts) < 5:
+        parts.append('')
+    action, message, category, module, lineno = [s.strip()
+                                                 for s in parts]
+    action = wmod._getaction(action)
+    category = wmod._getcategory(category)
+    if lineno:
+        try:
+            lineno = int(lineno)
+            if lineno < 0:
+                raise ValueError
+        except (ValueError, OverflowError):
+            raise wmod._OptionError("invalid lineno %r" % (lineno,))
+    else:
+        lineno = 0
+    wmod.filterwarnings(action, message, category, module, lineno)
+
+
+def pytest_addoption(parser):
+    group = parser.getgroup("pytest-warnings")
+    group.addoption(
+        '-W', '--pythonwarnings', action='append',
+        help="set which warnings to report, see -W option of python itself.")
+    parser.addini("filterwarnings", type="linelist",
+                  help="Each line specifies a pattern for "
+                  "warnings.filterwarnings. "
+                  "Processed after -W and --pythonwarnings.")
+
+
+@contextmanager
+def catch_warnings_for_item(item):
+    """
+    catches the warnings generated during setup/call/teardown execution
+    of the given item and after it is done posts them as warnings to this
+    item.
+    """
+    args = item.config.getoption('pythonwarnings') or []
+    inifilters = item.config.getini("filterwarnings")
+    with warnings.catch_warnings(record=True) as log:
+        for arg in args:
+            warnings._setoption(arg)
+
+        for arg in inifilters:
+            _setoption(warnings, arg)
+
+        mark = item.get_marker('filterwarnings')
+        if mark:
+            for arg in mark.args:
+                warnings._setoption(arg)
+
+        yield
+
+        for warning in log:
+            warn_msg = warning.message
+            unicode_warning = False
+
+            if compat._PY2 and any(isinstance(m, compat.UNICODE_TYPES) for m in warn_msg.args):
+                new_args = [compat.safe_str(m) for m in warn_msg.args]
+                unicode_warning = warn_msg.args != new_args
+                warn_msg.args = new_args
+
+            msg = warnings.formatwarning(
+                warn_msg, warning.category,
+                warning.filename, warning.lineno, warning.line)
+            item.warn("unused", msg)
+
+            if unicode_warning:
+                warnings.warn(
+                    "Warning is using unicode non convertible to ascii, "
+                    "converting to a safe representation:\n  %s" % msg,
+                    UnicodeWarning)
+
+
+@pytest.hookimpl(hookwrapper=True)
+def pytest_runtest_protocol(item):
+    with catch_warnings_for_item(item):
+        yield