isbn verifier exercise

python/isbn-verifier/isbn_verifier_test.py

@@ -0,0 +1,63 @@
+import unittest
+
+from isbn_verifier import is_valid
+
+
+# Tests adapted from `problem-specifications//canonical-data.json` @ v2.7.0
+
+class IsbnVerifierTest(unittest.TestCase):
+
+    def test_valid_isbn_number(self):
+        self.assertIs(is_valid('3-598-21508-8'), True)
+
+    def test_invalid_check_digit(self):
+        self.assertIs(is_valid('3-598-21508-9'), False)
+
+    def test_valid_with_X_check_digit(self):
+        self.assertIs(is_valid('3-598-21507-X'), True)
+
+    def test_invalid_check_digit_other_than_X(self):
+        self.assertIs(is_valid('3-598-21507-A'), False)
+
+    def test_invalid_character_in_isbn(self):
+        self.assertIs(is_valid('3-598-P1581-X'), False)
+
+    def test_invalid_X_other_than_check_digit(self):
+        self.assertIs(is_valid('3-598-2X507-9'), False)
+
+    def test_valid_isbn_without_separating_dashes(self):
+        self.assertIs(is_valid('3598215088'), True)
+
+    def test_valid_isbn_without_separating_dashes_with_X_check_digit(self):
+        self.assertIs(is_valid('359821507X'), True)
+
+    def test_invalid_isbn_without_check_digit_and_dashes(self):
+        self.assertIs(is_valid('359821507'), False)
+
+    def test_invalid_too_long_isbn_with_no_dashes(self):
+        self.assertIs(is_valid('3598215078X'), False)
+
+    def test_invalid_too_short_isbn(self):
+        self.assertIs(is_valid('00'), False)
+
+    def test_invalid_isbn_without_check_digit(self):
+        self.assertIs(is_valid('3-598-21507'), False)
+
+    def test_invalid_check_digit_X_used_for_0(self):
+        self.assertIs(is_valid('3-598-21515-X'), False)
+
+    def test_valid_empty_isbn(self):
+        self.assertIs(is_valid(''), False)
+
+    def test_input_is_nine_characters(self):
+        self.assertIs(is_valid('134456729'), False)
+
+    def test_invalid_characters_are_not_ignored(self):
+        self.assertIs(is_valid('3132P34035'), False)
+
+    def test_input_is_too_long_but_contains_a_valid_isbn(self):
+        self.assertIs(is_valid('98245726788'), False)
+
+
+if __name__ == '__main__':
+    unittest.main()