Test for null equality; fix null repr.

2 files changed, 15 insertions, 0 deletions

diff --git a/scss/tests/test_expression.py b/scss/tests/test_expression.py
index c1084c3..ace113b 100644
--- a/scss/tests/test_expression.py
+++ b/scss/tests/test_expression.py
@@ -112,6 +112,9 @@ def test_comparison_stringerific():
     assert not calc('"abc" != "abc"')
     assert not calc('"abc" == "xyz"')
 
+    # Interaction with other types
+    assert calc('123 != "123"')
+
     # Sass strings don't support ordering
     for expression in (
             '"abc" < "xyz"',
@@ -124,6 +127,15 @@ def test_comparison_stringerific():
         with pytest.raises(TypeError):
             calc(expression)
 
+def test_comparison_null():
+    calc = Calculator(Namespace()).calculate
+
+    assert calc('null == null')
+    assert calc('null != 0')
+
+    with pytest.raises(TypeError):
+        calc('null < null')
+
 
 
 # TODO write more!  i'm lazy.
diff --git a/scss/types.py b/scss/types.py
index 35a9691..0314ce6 100644
--- a/scss/types.py
+++ b/scss/types.py
@@ -91,6 +91,9 @@ class NullValue(Value):
     def __str__(self):
         return 'null'
 
+    def __repr__(self):
+        return "<%s>" % (type(self).__name__,)
+
     def __nonzero__(self):
         return False