new version with a new assertion

README.md

@@ -1,5 +1,5 @@
 # sure
-> Version 0.5.1
+> Version 0.6
 
 # What
 
@@ -26,11 +26,18 @@ a assertion toolbox that works fine with [nose](http://code.google.com/p/python-
     assert that(FooBar).has("attribute_one")
     assert that(FooBar).equals(FooBar)
 
+    # go faster
+
+    assert that(FooBar).at('attribute_one').equals('simple')
+
     # and also for dictionaries
 
     name = dict(john='doe')
     assert that(name).has('john')
 
+    # go faster
+    assert that(name).at('john').equals('doe')
+
 ## strings
 
     from sure import that

sure/__init__.py

@@ -30,7 +30,7 @@
 from pprint import pformat
 from threading import local
 from copy import deepcopy
-version = '0.5.1'
+version = '0.6'
 
 
 def itemize_length(items):
@@ -267,6 +267,14 @@ def differs(self, dst):
     def is_a(self, dst):
         return isinstance(self._src, dst)
 
+    def at(self, key):
+        assert self.has(key)
+        if isinstance(self._src, dict):
+            return that(self._src[key])
+
+        else:
+            return that(getattr(self._src, key))
+
     @explanation('%r should have %r, but have not')
     def has(self, that):
         return that in self

test_sure.py

@@ -163,6 +163,21 @@ class Class:
     assert "jo" in sure.that(name)
 
 
+def test_that_at_key_equals():
+    "sure.that().at(object).equals(object)"
+
+    class Class:
+        name = "some class"
+    Object = Class()
+    dictionary = {
+        'name': 'John',
+    }
+
+    assert that(Class).at("name").equals('some class')
+    assert that(Object).at("name").equals('some class')
+    assert that(dictionary).at("name").equals('John')
+
+
 def test_that_len_is():
     "sure.that() len_is(number)"