Added tests for string algorithms

Author: OmkarPathak

tests/test_string.py

@@ -0,0 +1,29 @@
+import unittest
+
+from pygorithm.string import (
+    anagram,
+    isogram,
+    pangram,
+    palindrome)
+
+class TestAnagram(unittest.TestCase):
+    def test_anagram(self):
+        self.assertEqual(anagram.is_anagram('ant', ['tan', 'stand', 'at']), ['tan'])
+
+class TestPangram(unittest.TestCase):
+    def test_pangram(self):
+        self.assertTrue(pangram.is_pangram('the quick brown fox jumps over the lazy dog'))
+        self.assertFalse(pangram.is_pangram('omkar'))
+
+class TestIsogram(unittest.TestCase):
+    def test_isogram(self):
+        self.assertTrue(isogram.is_isogram('isogram'))
+        self.assertFalse(isogram.is_isogram('eleven'))
+
+class TestPalindrome(unittest.TestCase):
+    def test_palindrome(self):
+        self.assertTrue(palindrome.is_palindrome('madam'))
+        self.assertFalse(palindrome.is_palindrome('eleven'))
+
+if __name__ == '__main__':
+    unittest.main()