grains: sync

part of #1824

exercises/practice/grains/.meta/test_template.tera

@@ -0,0 +1,22 @@
+use grains::*;
+
+{% for test in cases.0.cases %}
+#[test]
+#[ignore]
+{% if test.expected is object -%}
+#[should_panic]
+{% endif -%}
+fn {{ test.description | make_ident }}() {
+    {% if test.expected is number -%}
+    assert_eq!(square({{ test.input.square }}), {{ test.expected | fmt_num }});
+    {% else %}
+    square({{ test.input.square }});
+    {% endif -%}
+}
+{% endfor -%}
+
+#[test]
+#[ignore]
+fn returns_the_total_number_of_grains_on_the_board() {
+    assert_eq!(grains::total(), 18_446_744_073_709_551_615);
+}

exercises/practice/grains/.meta/tests.toml

@@ -28,6 +28,8 @@ description = "square 0 raises an exception"
 
 [61974483-eeb2-465e-be54-ca5dde366453]
 description = "negative square raises an exception"
+include = false
+comment = "u64 cannot be negative"
 
 [a95e4374-f32c-45a7-a10d-ffec475c012f]
 description = "square greater than 64 raises an exception"

exercises/practice/grains/tests/grains.rs

@@ -1,62 +1,59 @@
-fn process_square_case(input: u32, expected: u64) {
-    assert_eq!(grains::square(input), expected);
-}
+use grains::*;
 
 #[test]
-fn one() {
-    process_square_case(1, 1);
+fn grains_on_square_1() {
+    assert_eq!(square(1), 1);
 }
 
 #[test]
 #[ignore]
-fn two() {
-    process_square_case(2, 2);
+fn grains_on_square_2() {
+    assert_eq!(square(2), 2);
 }
 
 #[test]
 #[ignore]
-fn three() {
-    process_square_case(3, 4);
+fn grains_on_square_3() {
+    assert_eq!(square(3), 4);
 }
 
 #[test]
 #[ignore]
-fn four() {
-    process_square_case(4, 8);
+fn grains_on_square_4() {
+    assert_eq!(square(4), 8);
 }
 
 #[test]
 #[ignore]
-fn sixteen() {
-    process_square_case(16, 32_768);
+fn grains_on_square_16() {
+    assert_eq!(square(16), 32_768);
 }
 
 #[test]
 #[ignore]
-fn thirty_two() {
-    process_square_case(32, 2_147_483_648);
+fn grains_on_square_32() {
+    assert_eq!(square(32), 2_147_483_648);
 }
 
 #[test]
 #[ignore]
-fn sixty_four() {
-    process_square_case(64, 9_223_372_036_854_775_808);
+fn grains_on_square_64() {
+    assert_eq!(square(64), 9_223_372_036_854_775_808);
 }
 
 #[test]
 #[ignore]
-#[should_panic(expected = "Square must be between 1 and 64")]
-fn square_0_raises_an_exception() {
-    grains::square(0);
+#[should_panic]
+fn square_0_is_invalid() {
+    square(0);
 }
 
 #[test]
 #[ignore]
-#[should_panic(expected = "Square must be between 1 and 64")]
-fn square_greater_than_64_raises_an_exception() {
-    grains::square(65);
+#[should_panic]
+fn square_greater_than_64_is_invalid() {
+    square(65);
 }
-
 #[test]
 #[ignore]
 fn returns_the_total_number_of_grains_on_the_board() {