Fix constraints bug.

Add constraints unittests.
Update invalid words.

test_wordle.py

@@ -0,0 +1,47 @@
+#!/usr/bin/python
+
+
+import wordle
+
+from wordle import LetterResult
+
+import unittest
+
+
+class TestConstraints(unittest.TestCase):
+
+    def test_empty(self):
+        constraints = wordle.Constraints()
+        self.assertTrue(constraints.matches('abcde'))
+        self.assertTrue(constraints.matches('bcdef'))
+
+    def test_correct_single(self):
+        constraints = wordle.Constraints()
+        constraints.update_graded('abcde', [LetterResult.CORRECT, LetterResult.INCORRECT, LetterResult.INCORRECT, LetterResult.INCORRECT, LetterResult.INCORRECT])
+
+        self.assertTrue(constraints.matches('amnop'))
+        self.assertTrue(constraints.matches('aaaaa'))
+
+        self.assertFalse(constraints.matches('abcde'))
+        self.assertFalse(constraints.matches('lmnop'))
+        self.assertFalse(constraints.matches('aedcb'))
+        self.assertFalse(constraints.matches('amnob'))
+
+    def test_correct_duplicate_letter(self):
+        constraints = wordle.Constraints()
+        constraints.update_graded('aazzz', [LetterResult.CORRECT, LetterResult.INCORRECT, LetterResult.INCORRECT, LetterResult.INCORRECT, LetterResult.INCORRECT])
+
+        self.assertTrue(constraints.matches('abcde'))
+        self.assertTrue(constraints.matches('abbbb'))
+
+        self.assertFalse(constraints.matches('aabbb'))
+        self.assertFalse(constraints.matches('abbba'))
+        self.assertFalse(constraints.matches('bbbbb'))
+        self.assertFalse(constraints.matches('bbbba'))
+        self.assertFalse(constraints.matches('babbb'))
+
+
+
+
+if __name__ == '__main__':
+    unittest.main()