armstrong numbers

rust/armstrong-numbers/tests/armstrong_numbers.rs

@@ -0,0 +1,46 @@
+use armstrong_numbers::*;
+
+#[test]
+fn zero_is_an_armstrong_number() {
+    assert!(is_armstrong_number(0))
+}
+
+#[test]
+fn single_digit_numbers_are_armstrong_numbers() {
+    assert!(is_armstrong_number(5))
+}
+
+#[test]
+fn there_are_no_two_digit_armstrong_numbers() {
+    assert!(!is_armstrong_number(10))
+}
+
+#[test]
+fn three_digit_number_that_is_an_armstrong_number() {
+    assert!(is_armstrong_number(153))
+}
+
+#[test]
+fn three_digit_number_that_is_not_an_armstrong_number() {
+    assert!(!is_armstrong_number(100))
+}
+
+#[test]
+fn four_digit_number_that_is_an_armstrong_number() {
+    assert!(is_armstrong_number(9_474))
+}
+
+#[test]
+fn four_digit_number_that_is_not_an_armstrong_number() {
+    assert!(!is_armstrong_number(9_475))
+}
+
+#[test]
+fn seven_digit_number_that_is_an_armstrong_number() {
+    assert!(is_armstrong_number(9_926_315))
+}
+
+#[test]
+fn seven_digit_number_that_is_not_an_armstrong_number() {
+    assert!(!is_armstrong_number(9_926_314))
+}