leap: Updated exercise to 1.4.0 version

exercises/leap/Cargo.toml

@@ -1,3 +1,3 @@
 [package]
 name = "leap"
-version = "1.0.0"
+version = "1.4.0"

exercises/leap/example.rs

@@ -1,4 +1,4 @@
-pub fn is_leap_year(year: i32) -> bool {
+pub fn is_leap_year(year: u64) -> bool {
     let has_factor = |n| year % n == 0;
     has_factor(4) && (!has_factor(100) || has_factor(400))
 }

exercises/leap/src/lib.rs

@@ -1,3 +1,3 @@
-pub fn is_leap_year(year: i32) -> bool {
+pub fn is_leap_year(year: u64) -> bool {
     unimplemented!("true if {} is a leap year", year)
 }

exercises/leap/tests/leap.rs

@@ -1,8 +1,36 @@
 extern crate leap;
 
+fn process_leapyear_case(year: u64, expected: bool) {
+    assert_eq!(leap::is_leap_year(year), expected);
+}
+
+#[test]
+fn test_year_divisible_by_4_not_divisible_by_100_leap_year() {
+    process_leapyear_case(1996, true);
+}
+
+#[test]
+#[ignore]
+fn test_year_not_divisible_by_4_common_year() {
+    process_leapyear_case(2015, false);
+}
+
 #[test]
-fn test_vanilla_leap_year() {
-    assert_eq!(leap::is_leap_year(1996), true);
+#[ignore]
+fn test_year_divisible_by_200_not_divisible_by_400_common_year() {
+    process_leapyear_case(1800, false);
+}
+
+#[test]
+#[ignore]
+fn test_year_divisible_by_100_not_divisible_by_400_common_year() {
+    process_leapyear_case(2100, false);
+}
+
+#[test]
+#[ignore]
+fn test_year_divisible_by_400_leap_year() {
+    process_leapyear_case(2000, true);
 }
 
 #[test]