Added armstrong numbers back in because configlit was unhappy.

exercises/practice/armstrong-numbers/armstrong_numbers_test.py

@@ -0,0 +1,40 @@
+import unittest
+
+from armstrong_numbers import (
+    is_armstrong_number,
+)
+
+# Tests adapted from `problem-specifications//canonical-data.json`
+
+
+class ArmstrongNumbersTest(unittest.TestCase):
+    def test_zero_is_an_armstrong_number(self):
+        self.assertIs(is_armstrong_number(0), True)
+
+    def test_single_digit_numbers_are_armstrong_numbers(self):
+        self.assertIs(is_armstrong_number(5), True)
+
+    def test_there_are_no_two_digit_armstrong_numbers(self):
+        self.assertIs(is_armstrong_number(10), False)
+
+    def test_three_digit_number_that_is_an_armstrong_number(self):
+        self.assertIs(is_armstrong_number(153), True)
+
+    def test_three_digit_number_that_is_not_an_armstrong_number(self):
+        self.assertIs(is_armstrong_number(100), False)
+
+    def test_four_digit_number_that_is_an_armstrong_number(self):
+        self.assertIs(is_armstrong_number(9474), True)
+
+    def test_four_digit_number_that_is_not_an_armstrong_number(self):
+        self.assertIs(is_armstrong_number(9475), False)
+
+    def test_seven_digit_number_that_is_an_armstrong_number(self):
+        self.assertIs(is_armstrong_number(9926315), True)
+
+    def test_seven_digit_number_that_is_not_an_armstrong_number(self):
+        self.assertIs(is_armstrong_number(9926314), False)
+
+
+if __name__ == "__main__":
+    unittest.main()