TEST: Add extra debugging information to CPU features detection

1 files changed, 49 insertions, 5 deletions

diff --git a/numpy/core/tests/test_cpu_features.py b/numpy/core/tests/test_cpu_features.py
index 337b7330c..44671b61c 100644
--- a/numpy/core/tests/test_cpu_features.py
+++ b/numpy/core/tests/test_cpu_features.py
@@ -1,8 +1,53 @@
 import sys, platform, re, pytest
-
-from numpy.testing import assert_equal
 from numpy.core._multiarray_umath import __cpu_features__
 
+def assert_equal(actual, desired, fname):
+    __tracebackhide__ = True  # Hide traceback for py.test
+    actual, desired = str(actual), str(desired)
+    if actual == desired:
+        return
+    detected = str(__cpu_features__).replace("'", "")
+    try:
+        with open("/proc/cpuinfo", "r") as fd:
+            cpuinfo = fd.read(2048)
+    except Exception as err:
+        cpuinfo = str(err)
+
+    try:
+        import subprocess
+        auxv = subprocess.check_output(['/bin/true'], env=dict(LD_SHOW_AUXV="1"))
+        auxv = auxv.decode()
+    except Exception as err:
+        auxv = str(err)
+
+    import textwrap
+    error_report = textwrap.indent(
+"""
+###########################################
+### Extra debugging information
+###########################################
+-------------------------------------------
+--- NumPy Detections
+-------------------------------------------
+%s
+-------------------------------------------
+--- SYS / CPUINFO
+-------------------------------------------
+%s....
+-------------------------------------------
+--- SYS / AUXV
+-------------------------------------------
+%s
+""" % (detected, cpuinfo, auxv), prefix='\r')
+
+    raise AssertionError((
+        "Failure Detection\n"
+        " NAME: '%s'\n"
+        " ACTUAL: %s\n"
+        " DESIRED: %s\n"
+        "%s"
+    ) % (fname, actual, desired, error_report))
+
 class AbstractTest(object):
     features = []
     features_groups = {}
@@ -12,17 +57,16 @@ class AbstractTest(object):
     def load_flags(self):
         # a hook
         pass
-
     def test_features(self):
         self.load_flags()
         for gname, features in self.features_groups.items():
             test_features = [self.cpu_have(f) for f in features]
-            assert_equal(__cpu_features__.get(gname), all(test_features))
+            assert_equal(__cpu_features__.get(gname), all(test_features), gname)
 
         for feature_name in self.features:
             cpu_have = self.cpu_have(feature_name)
             npy_have = __cpu_features__.get(feature_name)
-            assert_equal(npy_have, cpu_have)
+            assert_equal(npy_have, cpu_have, feature_name)
 
     def cpu_have(self, feature_name):
         map_names = self.features_map.get(feature_name, feature_name)