diff --git a/ramda/private/_has.py b/ramda/private/_has.py
index 4e84c95..0e48386 100644
--- a/ramda/private/_has.py
+++ b/ramda/private/_has.py
@@ -1,4 +1,9 @@
 def _has(obj, key):
+  '''
+  Since python object can not have None property, we just check for dict.
+  '''
+  if key is None:
+    return isinstance(obj, dict) and key in obj
   if isinstance(obj, dict):
     return key in obj or hasattr(obj, key)
   return hasattr(obj, key)
diff --git a/test/test_ap.py b/test/test_ap.py
new file mode 100644
index 0000000..781300d
--- /dev/null
+++ b/test/test_ap.py
@@ -0,0 +1,25 @@
+
+import unittest
+
+import ramda as R
+
+"""
+https://github.com/ramda/ramda/blob/master/test/ap.js
+"""
+
+
+class TestAp(unittest.TestCase):
+  def test_returns_an_array_of_tuples(self):
+    a = [1, 2, 3]
+    b = [100, 200, 300]
+    self.assertEqual([[1, 100], [2, 200], [3, 300]], R.zip(a, b))
+
+  def test_returns_a_list_as_long_as_the_shorter_of_the_lists_input(self):
+    a = [1, 2, 3]
+    b = [100, 200, 300, 400]
+    c = [10, 20]
+    self.assertEqual([[1, 100], [2, 200], [3, 300]], R.zip(a, b))
+    self.assertEqual([[1, 10], [2, 20]], R.zip(a, c))
+
+if __name__ == '__main__':
+  unittest.main()
diff --git a/test/test_into.py b/test/test_into.py
index 66f903e..a727f53 100644
--- a/test/test_into.py
+++ b/test/test_into.py
@@ -21,20 +21,28 @@ class TestInto(unittest.TestCase):
   def test_transduces_into_arrays(self):
     self.assertEqual([2, 3, 4, 5], R.into([], R.map(add(1)), [1, 2, 3, 4]))
     self.assertEqual([1, 3], R.into([], R.filter(isOdd), [1, 2, 3, 4]))
-    # TODO: take
+    self.assertEqual([2, 3], R.into([], R.compose(R.map(add(1)), R.take(2)), [1, 2, 3, 4]))
 
   def test_transduces_into_strings(self):
     self.assertEqual('2345', R.into('', R.map(add(1)), [1, 2, 3, 4]))
     self.assertEqual('13', R.into('', R.filter(isOdd), [1, 2, 3, 4]))
-    # TODO: take
+    self.assertEqual('23', R.into('', R.compose(R.map(add(1)), R.take(2)), [1, 2, 3, 4]))
 
   def test_transduces_into_dicts(self):
     self.assertEqual({'a': 1, 'b': 2}, R.into({}, R.identity, [['a', 1], ['b', 2]]))
     self.assertEqual({'a': 1, 'b': 2, 'c': 3}, R.into({}, R.identity, [{'a': 1}, {'b': 2, 'c': 3}]))
 
   def test_dispatches_to_objects_that_implement_reduce(self):
-    pass
-    # TODO: we do not support object currently
+    class Obj:
+      def __init__(self, x):
+        self.x = x
+
+      def reduce(self, f, acc):
+        return 'override'
+
+    obj = Obj([1, 2, 3])
+    self.assertEqual('override', R.into([], R.map(add(1)), obj))
+    self.assertEqual('override', R.into([], R.filter(isOdd), obj))
 
   def test_allows_custom_transformer(self):
     intoSum = R.into(addXf)
diff --git a/test/test_juxt.py b/test/test_juxt.py
index 63aef92..60e20f0 100644
--- a/test/test_juxt.py
+++ b/test/test_juxt.py
@@ -2,6 +2,7 @@
 import unittest
 
 import ramda as R
+from ramda.private._inspect import funcArgsLength
 
 """
 https://github.com/ramda/ramda/blob/master/test/juxt.js
@@ -42,8 +43,8 @@ def test_works_with_some_functions_and_some_value(self):
     self.assertEqual([5, 6], R.juxt([R.add, R.multiply])(2, 3))
 
   def test_retains_the_highest_arity(self):
-    # TODO: nAry
-    pass
+    f = R.juxt([R.nAry(1, R.T), R.nAry(3, R.T), R.nAry(2, R.T)])
+    self.assertEqual(3, funcArgsLength(f))
 
   def test_returns_a_curried_function(self):
     self.assertEqual([6, 5], R.juxt([R.multiply, R.add])(2)(3))
diff --git a/test/test_prop.py b/test/test_prop.py
index 55e8b95..74b15d8 100644
--- a/test/test_prop.py
+++ b/test/test_prop.py
@@ -27,11 +27,9 @@ def test_shows_the_same_behaviour_as_path_for_a_nonexistent_property(self):
     self.assertEqual(propResult, pathResult)
 
   def test_shows_the_same_behaviour_as_path_for_a_None_property(self):
-    # TODO: fix getAttribute
-    # propResult = R.prop(None, fred)
-    # pathResult = R.path([None], fred)
-    # self.assertEqual(propResult, pathResult)
-    pass
+    propResult = R.prop(None, fred)
+    pathResult = R.path([None], fred)
+    self.assertEqual(propResult, pathResult)
 
   def test_shows_the_same_behaviour_as_path_for_a_valid_property_and_object(self):
     propResult = R.prop('age', fred)
@@ -59,11 +57,9 @@ def test_shows_the_same_behaviour_as_path_for_a_nonexistent_property(self):
     self.assertEqual(propResult, pathResult)
 
   def test_shows_the_same_behaviour_as_path_for_a_None_property(self):
-    # TODO: fix getAttribute
-    # propResult = R.prop(None, fredObj)
-    # pathResult = R.path([None], fredObj)
-    # self.assertEqual(propResult, pathResult)
-    pass
+    propResult = R.prop(None, fredObj)
+    pathResult = R.path([None], fredObj)
+    self.assertEqual(propResult, pathResult)
 
   def test_shows_the_same_behaviour_as_path_for_a_valid_property_and_object(self):
     propResult = R.prop('age', fredObj)