add working test case for explicit params

We will later make it fail, but want to show a nice diff in the next
commit.

test_classy/test_decorators.py

@@ -56,4 +56,6 @@ def test_params_decorator_delete():
     eq_(b"Params Decorator Delete 1234", resp.data)
 
 
-
+def test_explicit_params_decorator():
+    resp = client.get('/decorated/explicit/foo/bar')
+    eq_(b"Explicit param foobar", resp.data)

test_classy/view_classes.py

@@ -186,6 +186,13 @@ def decorated_function(*args, **kwargs):
     return decorator
 
 
+def explicit_params_decorator(f):
+    @wraps(f)
+    def wrapper(*args, **kwargs):
+        return f(*args, **kwargs)
+    return wrapper
+
+
 def recursive_decorator(f):
     @wraps(f)
     def decorated_view(*args, **kwargs):
@@ -253,6 +260,9 @@ def someval(self, val):
     def anotherval(self, val):
         return "Anotherval " + val
 
+    @explicit_params_decorator
+    def explicit(self, arg1, arg2):
+        return "Explicit param " + arg1 + arg2
 
 
 class InheritanceView(BasicView):