remove duplicates, add tests

Author: derek73

nameparser/config/prefixes.py

@@ -42,7 +42,6 @@
     'ste',
     'van',
     'vander',
-    'van der',
     'vel',
     'von',
     'vom',

tests.py

@@ -1979,6 +1979,21 @@ def test_title_with_periods_lastname_comma(self):
         self.m(hn.first, "John", hn)
         self.m(hn.last, "Doe", hn)
 
+    def test_mac_with_spaces(self):
+        hn = HumanName("Jane Mac Beth")
+        self.m(hn.first, "Jane", hn)
+        self.m(hn.last, "Mac Beth", hn)
+
+    def test_mac_as_first_name(self):
+        hn = HumanName("Mac Miller")
+        self.m(hn.first, "Mac", hn)
+        self.m(hn.last, "Miller", hn)
+
+    def test_multiple_prefixes(self):
+        hn = HumanName("Mike van der Velt")
+        self.m(hn.first, "Mike", hn)
+        self.m(hn.last, "van der Velt", hn)
+
 
 class HumanNameCapitalizationTestCase(HumanNameTestBase):
     def test_capitalization_exception_for_III(self):