luhn: sync

part of #1824

exercises/practice/luhn/.docs/instructions.md

@@ -22,7 +22,8 @@ The first step of the Luhn algorithm is to double every second digit, starting f
 We will be doubling
 
 ```text
-4_3_ 3_9_ 0_4_ 6_6_
+4539 3195 0343 6467
+↑ ↑  ↑ ↑  ↑ ↑  ↑ ↑  (double these)
 ```
 
 If doubling the number results in a number greater than 9 then subtract 9 from the product.

exercises/practice/luhn/.meta/test_template.tera

@@ -0,0 +1,9 @@
+use luhn::*;
+
+{% for test in cases %}
+#[test]
+#[ignore]
+fn {{ test.description | make_ident }}() {
+    assert_eq!(is_valid({{ test.input.value | json_encode() }}), {{ test.expected }});
+}
+{% endfor -%}

exercises/practice/luhn/.meta/tests.toml

@@ -1,3 +1,76 @@
-# This is an auto-generated file. Regular comments will be removed when this
-# file is regenerated. Regenerating will not touch any manually added keys,
-# so comments can be added in a "comment" key.
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[792a7082-feb7-48c7-b88b-bbfec160865e]
+description = "single digit strings can not be valid"
+
+[698a7924-64d4-4d89-8daa-32e1aadc271e]
+description = "a single zero is invalid"
+
+[73c2f62b-9b10-4c9f-9a04-83cee7367965]
+description = "a simple valid SIN that remains valid if reversed"
+
+[9369092e-b095-439f-948d-498bd076be11]
+description = "a simple valid SIN that becomes invalid if reversed"
+
+[8f9f2350-1faf-4008-ba84-85cbb93ffeca]
+description = "a valid Canadian SIN"
+
+[1cdcf269-6560-44fc-91f6-5819a7548737]
+description = "invalid Canadian SIN"
+
+[656c48c1-34e8-4e60-9a5a-aad8a367810a]
+description = "invalid credit card"
+
+[20e67fad-2121-43ed-99a8-14b5b856adb9]
+description = "invalid long number with an even remainder"
+
+[7e7c9fc1-d994-457c-811e-d390d52fba5e]
+description = "invalid long number with a remainder divisible by 5"
+
+[ad2a0c5f-84ed-4e5b-95da-6011d6f4f0aa]
+description = "valid number with an even number of digits"
+
+[ef081c06-a41f-4761-8492-385e13c8202d]
+description = "valid number with an odd number of spaces"
+
+[bef66f64-6100-4cbb-8f94-4c9713c5e5b2]
+description = "valid strings with a non-digit added at the end become invalid"
+
+[2177e225-9ce7-40f6-b55d-fa420e62938e]
+description = "valid strings with punctuation included become invalid"
+
+[ebf04f27-9698-45e1-9afe-7e0851d0fe8d]
+description = "valid strings with symbols included become invalid"
+
+[08195c5e-ce7f-422c-a5eb-3e45fece68ba]
+description = "single zero with space is invalid"
+
+[12e63a3c-f866-4a79-8c14-b359fc386091]
+description = "more than a single zero is valid"
+
+[ab56fa80-5de8-4735-8a4a-14dae588663e]
+description = "input digit 9 is correctly converted to output digit 9"
+
+[b9887ee8-8337-46c5-bc45-3bcab51bc36f]
+description = "very long input is valid"
+
+[8a7c0e24-85ea-4154-9cf1-c2db90eabc08]
+description = "valid luhn with an odd number of digits and non zero first digit"
+
+[39a06a5a-5bad-4e0f-b215-b042d46209b1]
+description = "using ascii value for non-doubled non-digit isn't allowed"
+
+[f94cf191-a62f-4868-bc72-7253114aa157]
+description = "using ascii value for doubled non-digit isn't allowed"
+
+[8b72ad26-c8be-49a2-b99c-bcc3bf631b33]
+description = "non-numeric, non-space char in the middle with a sum that's divisible by 10 isn't allowed"

exercises/practice/luhn/tests/luhn.rs

@@ -1,141 +1,135 @@
 use luhn::*;
 
-fn process_valid_case(number: &str, is_luhn_expected: bool) {
-    assert_eq!(is_valid(number), is_luhn_expected);
-}
-
 #[test]
 fn single_digit_strings_can_not_be_valid() {
-    process_valid_case("1", false);
+    assert_eq!(is_valid("1"), false);
 }
 
 #[test]
 #[ignore]
 fn a_single_zero_is_invalid() {
-    process_valid_case("0", false);
+    assert_eq!(is_valid("0"), false);
 }
 
 #[test]
 #[ignore]
 fn a_simple_valid_sin_that_remains_valid_if_reversed() {
-    process_valid_case("059", true);
+    assert_eq!(is_valid("059"), true);
 }
 
 #[test]
 #[ignore]
 fn a_simple_valid_sin_that_becomes_invalid_if_reversed() {
-    process_valid_case("59", true);
+    assert_eq!(is_valid("59"), true);
 }
 
 #[test]
 #[ignore]
 fn a_valid_canadian_sin() {
-    process_valid_case("055 444 285", true);
+    assert_eq!(is_valid("055 444 285"), true);
 }
 
 #[test]
 #[ignore]
 fn invalid_canadian_sin() {
-    process_valid_case("055 444 286", false);
+    assert_eq!(is_valid("055 444 286"), false);
 }
 
 #[test]
 #[ignore]
 fn invalid_credit_card() {
-    process_valid_case("8273 1232 7352 0569", false);
+    assert_eq!(is_valid("8273 1232 7352 0569"), false);
 }
 
 #[test]
 #[ignore]
-fn valid_number_with_an_even_number_of_digits() {
-    process_valid_case("095 245 88", true);
+fn invalid_long_number_with_an_even_remainder() {
+    assert_eq!(is_valid("1 2345 6789 1234 5678 9012"), false);
 }
 
 #[test]
 #[ignore]
-fn strings_that_contain_non_digits_are_invalid() {
-    process_valid_case("055a 444 285", false);
+fn invalid_long_number_with_a_remainder_divisible_by_5() {
+    assert_eq!(is_valid("1 2345 6789 1234 5678 9013"), false);
 }
 
 #[test]
 #[ignore]
-fn valid_strings_with_punctuation_included_become_invalid() {
-    process_valid_case("055-444-285", false);
+fn valid_number_with_an_even_number_of_digits() {
+    assert_eq!(is_valid("095 245 88"), true);
 }
 
 #[test]
 #[ignore]
-fn symbols_are_invalid() {
-    process_valid_case("055£ 444$ 285", false);
+fn valid_number_with_an_odd_number_of_spaces() {
+    assert_eq!(is_valid("234 567 891 234"), true);
 }
 
 #[test]
 #[ignore]
-fn single_zero_with_space_is_invalid() {
-    process_valid_case(" 0", false);
+fn valid_strings_with_a_non_digit_added_at_the_end_become_invalid() {
+    assert_eq!(is_valid("059a"), false);
 }
 
 #[test]
 #[ignore]
-fn more_than_a_single_zero_is_valid() {
-    process_valid_case("0000 0", true);
+fn valid_strings_with_punctuation_included_become_invalid() {
+    assert_eq!(is_valid("055-444-285"), false);
 }
 
 #[test]
 #[ignore]
-fn input_digit_9_is_correctly_converted_to_output_digit_9() {
-    process_valid_case("091", true);
+fn valid_strings_with_symbols_included_become_invalid() {
+    assert_eq!(is_valid("055# 444$ 285"), false);
 }
 
 #[test]
 #[ignore]
-/// using ASCII value for doubled non-digit isn't allowed
-/// Convert non-digits to their ASCII values and then offset them by 48 sometimes accidentally declare an invalid string to be valid.
-/// This test is designed to avoid that solution.
-fn using_ascii_value_for_doubled_nondigit_isnt_allowed() {
-    process_valid_case(":9", false);
+fn single_zero_with_space_is_invalid() {
+    assert_eq!(is_valid(" 0"), false);
 }
 
 #[test]
 #[ignore]
-/// valid strings with a non-digit added at the end become invalid
-fn valid_strings_with_a_nondigit_added_at_the_end_become_invalid() {
-    process_valid_case("059a", false);
+fn more_than_a_single_zero_is_valid() {
+    assert_eq!(is_valid("0000 0"), true);
 }
 
 #[test]
 #[ignore]
-/// valid strings with symbols included become invalid
-fn valid_strings_with_symbols_included_become_invalid() {
-    process_valid_case("055# 444$ 285", false);
+fn input_digit_9_is_correctly_converted_to_output_digit_9() {
+    assert_eq!(is_valid("091"), true);
 }
 
 #[test]
 #[ignore]
-/// using ASCII value for non-doubled non-digit isn't allowed
-/// Convert non-digits to their ASCII values and then offset them by 48 sometimes accidentally declare an invalid string to be valid.
-/// This test is designed to avoid that solution.
-fn using_ascii_value_for_nondoubled_nondigit_isnt_allowed() {
-    process_valid_case("055b 444 285", false);
+fn very_long_input_is_valid() {
+    assert_eq!(
+        is_valid("9999999999 9999999999 9999999999 9999999999"),
+        true
+    );
 }
 
 #[test]
 #[ignore]
-/// valid number with an odd number of spaces
-fn valid_number_with_an_odd_number_of_spaces() {
-    process_valid_case("234 567 891 234", true);
+fn valid_luhn_with_an_odd_number_of_digits_and_non_zero_first_digit() {
+    assert_eq!(is_valid("109"), true);
+}
+
+#[test]
+#[ignore]
+fn using_ascii_value_for_non_doubled_non_digit_isn_t_allowed() {
+    assert_eq!(is_valid("055b 444 285"), false);
 }
 
 #[test]
 #[ignore]
-/// non-numeric, non-space char in the middle with a sum that's divisible by 10 isn't allowed
-fn invalid_char_in_middle_with_sum_divisible_by_10_isnt_allowed() {
-    process_valid_case("59%59", false);
+fn using_ascii_value_for_doubled_non_digit_isn_t_allowed() {
+    assert_eq!(is_valid(":9"), false);
 }
 
 #[test]
 #[ignore]
-/// unicode numeric characters are not allowed in a otherwise valid number
-fn valid_strings_with_numeric_unicode_characters_become_invalid() {
-    process_valid_case("1249①", false);
+fn non_numeric_non_space_char_in_the_middle_with_a_sum_that_s_divisible_by_10_isn_t_allowed() {
+    assert_eq!(is_valid("59%59"), false);
 }