Update tests and documentation for crate version features

tox/src/lib.rs

@@ -5,15 +5,19 @@ pub use tox_crypto as crypto;
 pub use tox_encryptsave as encryptsave;
 pub use tox_packet as packet;
 
+/// The tox crate version string in the form "major.minor.patch" (e.g. "1.2.3")
 pub fn crate_version() -> String {
     env!("CARGO_PKG_VERSION").to_string()
 }
+/// The tox crate major version represented as unsigned integer
 pub fn crate_version_major() -> u32 {
     env!("CARGO_PKG_VERSION_MAJOR").parse().expect("Invalid major version")
 }
+/// The tox crate minor version represented as unsigned integer
 pub fn crate_version_minor() -> u32 {
     env!("CARGO_PKG_VERSION_MINOR").parse().expect("Invalid minor version")
 }
+/// The tox crate patch version represented as unsigned integer
 pub fn crate_version_patch() -> u32 {
     env!("CARGO_PKG_VERSION_PATCH").parse().expect("Invalid patch version")
 }
@@ -27,16 +31,19 @@ mod tests {
 
     #[test]
     fn crate_version_major() {
-        crate::crate_version_major();
+        let v = crate::crate_version_major();
+        assert_eq!(v, env!("CARGO_PKG_VERSION_MAJOR").parse::<u32>().unwrap());
     }
 
     #[test]
     fn crate_version_minor() {
-        crate::crate_version_minor();
+        let v = crate::crate_version_minor();
+        assert_eq!(v, env!("CARGO_PKG_VERSION_MINOR").parse::<u32>().unwrap());
     }
 
     #[test]
     fn crate_version_patch() {
-        crate::crate_version_patch();
+        let v = crate::crate_version_patch();
+        assert_eq!(v, env!("CARGO_PKG_VERSION_PATCH").parse::<u32>().unwrap());
     }
 }