diff --git a/test/test_functest.py b/test/test_functest.py
index 1ec92a8d..465b639a 100644
--- a/test/test_functest.py
+++ b/test/test_functest.py
@@ -43,7 +43,7 @@ def check_functest(implementation):
 def check_functest_sanitizers(implementation):
     env = None
     if platform.machine() == 'ppc' and os.environ.get('CC', 'gcc') == 'clang':
-        raise unittest.SkipTest()
+        raise unittest.SkipTest("Clang does not support ASAN on ppc")
     elif platform.machine() in ['armv7l', 'aarch64']:
         env = {'ASAN_OPTIONS': 'detect_leaks=0'}
     else:
diff --git a/test/test_metadata.py b/test/test_metadata.py
index b5112576..71ca7798 100644
--- a/test/test_metadata.py
+++ b/test/test_metadata.py
@@ -23,7 +23,7 @@ def check_metadata(scheme):
         specification = itertools.chain(specification,
                                         SIGNATURE_FIELDS.items())
     else:
-        assert(False)
+        assert False, "Wrong type of metadata"
 
     check_spec(copy.deepcopy(metadata), specification)
 
diff --git a/test/test_symbol_namespace.py b/test/test_symbol_namespace.py
index 654d2dda..5d6ea9a0 100644
--- a/test/test_symbol_namespace.py
+++ b/test/test_symbol_namespace.py
@@ -10,18 +10,17 @@ import unittest
 
 
 def test_symbol_namespace():
-    if sys.platform not in ['linux', 'darwin']:
-        raise unittest.SkipTest()
     for scheme in pqclean.Scheme.all_schemes():
         for implementation in scheme.implementations:
             yield check_symbol_namespace, implementation
 
 
 def check_symbol_namespace(implementation):
+    if sys.platform not in ['linux', 'darwin']:
+        raise unittest.SkipTest("Unsupported platform")
     helpers.make(working_dir=implementation.path())
     out = helpers.run_subprocess(
-        ['nm', '-g', 'lib{}_{}.a'.format(implementation.scheme.name,
-                                         implementation.name)],
+        ['nm', '-g', implementation.libname()],
         implementation.path()
     )