sum-of-multiples

rust/sum-of-multiples/tests/sum_of_multiples.rs

@@ -0,0 +1,145 @@
+use sum_of_multiples::*;
+
+#[test]
+fn no_multiples_within_limit() {
+    let factors = &[3, 5];
+    let limit = 1;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 0;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn one_factor_has_multiples_within_limit() {
+    let factors = &[3, 5];
+    let limit = 4;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 3;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn more_than_one_multiple_within_limit() {
+    let factors = &[3];
+    let limit = 7;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 9;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn more_than_one_factor_with_multiples_within_limit() {
+    let factors = &[3, 5];
+    let limit = 10;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 23;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn each_multiple_is_only_counted_once() {
+    let factors = &[3, 5];
+    let limit = 100;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 2_318;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn a_much_larger_limit() {
+    let factors = &[3, 5];
+    let limit = 1_000;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 233_168;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn three_factors() {
+    let factors = &[7, 13, 17];
+    let limit = 20;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 51;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn factors_not_relatively_prime() {
+    let factors = &[4, 6];
+    let limit = 15;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 30;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn some_pairs_of_factors_relatively_prime_and_some_not() {
+    let factors = &[5, 6, 8];
+    let limit = 150;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 4_419;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn one_factor_is_a_multiple_of_another() {
+    let factors = &[5, 25];
+    let limit = 51;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 275;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn much_larger_factors() {
+    let factors = &[43, 47];
+    let limit = 10_000;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 2_203_160;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn all_numbers_are_multiples_of_1() {
+    let factors = &[1];
+    let limit = 100;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 4_950;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn no_factors_means_an_empty_sum() {
+    let factors = &[];
+    let limit = 10_000;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 0;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_only_multiple_of_0_is_0() {
+    let factors = &[0];
+    let limit = 1;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 0;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn the_factor_0_does_not_affect_the_sum_of_multiples_of_other_factors() {
+    let factors = &[3, 0];
+    let limit = 4;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 3;
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn solutions_using_include_exclude_must_extend_to_cardinality_greater_than_3() {
+    let factors = &[2, 3, 5, 7, 11];
+    let limit = 10_000;
+    let output = sum_of_multiples(limit, factors);
+    let expected = 39_614_537;
+    assert_eq!(output, expected);
+}