added common file for tests

tests/common.py

@@ -0,0 +1,79 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from functools import wraps
+
+def ok_(b, msg=None):
+    if not msg:
+        assert b
+    else:
+        assert b, msg
+
+def eq_(x, y, msg=None):
+    if msg is None:
+        assert x == y
+    else:
+        assert x == y, msg
+
+def neq_(x, y, msg=None):
+    if msg is None:
+        assert x != y
+    else:
+        assert x != y, msg
+
+def gt_(x, y, msg=None):
+    if msg is None:
+        assert x > y
+    else:
+        assert x > y, msg
+
+def gte_(x, y, msg=None):
+    if msg is None:
+        assert x >= y
+    else:
+        assert x >= y, msg
+
+
+def lt_(x, y, msg=None):
+    if msg is None:
+        assert x < y
+    else:
+        assert x < y, msg
+
+def lte_(x, y, msg=None):
+    if msg is None:
+        assert x <= y
+    else:
+        assert x <= y, msg
+
+class assert_raises:
+    def __init__(self, exception_type):
+        self.exception_type = exception_type
+
+    def __enter__(self):
+        pass
+
+    def __exit__(self, type, value, traceback):
+        if type is None:
+            raise AssertionError("Expected exception %s not raised" % self.exception_type)
+        if type != self.exception_type:
+            raise AssertionError("Expected exception %s, got %s" % (self.exception_type, type))
+        return True
+
+def raises(exception_type):    
+    def decorator(f):
+        @wraps(f)
+        def wrapper(*args, **kwargs):
+            with assert_raises(exception_type):
+                f(*args, **kwargs)
+        return wrapper
+    return decorator