Add simple tests to utils description functions

I initially ended up in this file looking to take on issue #707
which I realized had been already done. Having touched the file though
I thought it good to add some basic tests to get used to the workflow
on the project and how things are setup here.

This commit adds some basic requests and cleans up some comments
which appear to have been left as placeholders for work which appears
to have been completed already.

I attempted to test the tool_desc and armor_desc functions, but realized
I wasn't sure how to best create an instance of Armor or Tool without
modifying other files to make more things public.

This is my first commit on the project, and was intentionally kept
simple accordingly.

voxygen/src/hud/util.rs

@@ -34,6 +34,7 @@ pub fn item_text<'a>(item: &'a impl ItemDesc) -> (&'_ str, Cow<'a, str>) {
     (item.name(), desc)
 }
 
+// TODO: localization
 fn glider_desc(desc: &str) -> String { format!("Glider\n\n{}\n\n<Right-Click to use>", desc) }
 
 fn consumable_desc(desc: &str) -> String {
@@ -50,7 +51,6 @@ fn ingredient_desc(desc: &str) -> String { format!("Crafting Ingredient\n\n{}",
 
 fn lantern_desc(desc: &str) -> String { format!("Lantern\n\n{}\n\n<Right-Click to use>", desc) }
 
-// Armor Description
 fn armor_desc(armor: &Armor, desc: &str) -> String {
     // TODO: localization
     let kind = match armor.kind {
@@ -80,9 +80,8 @@ fn armor_desc(armor: &Armor, desc: &str) -> String {
         format!("{}\n\nArmor: {}\n\n<Right-Click to use>", kind, armor)
     }
 }
-// Weapon/Tool Description
+
 fn tool_desc(tool: &Tool, desc: &str) -> String {
-    // TODO: localization
     let kind = match tool.kind {
         ToolKind::Sword => "Sword",
         ToolKind::Axe => "Axe",
@@ -117,21 +116,68 @@ fn tool_desc(tool: &Tool, desc: &str) -> String {
         )
     }
 }
-// Consumable Description
-/*fn consumable_desc(consumable: Consumable, desc: &str) -> String {
-    // TODO: localization
-    let kind = "Consumable";
-    if !desc.is_empty() {
-        format!("{}\n\n{}\n\n<Right-Click to use>", kind, desc)
-    } else {
-        format!("{}\n\n<Right-Click to use>", kind)
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_glider_desc() {
+        let item_description = "mushrooms";
+
+        assert_eq!(
+            "Glider\n\nmushrooms\n\n<Right-Click to use>",
+            glider_desc(item_description)
+        );
     }
-}*/
 
-// Throwable Description
+    #[test]
+    fn test_consumable_desc() {
+        let item_description = "mushrooms";
 
-// Utility Description
+        assert_eq!(
+            "Consumable\n\nmushrooms\n\n<Right-Click to use>",
+            consumable_desc(item_description)
+        );
+    }
 
-// Ingredient Description
+    #[test]
+    fn test_throwable_desc() {
+        let item_description = "mushrooms";
 
-// Lantern Description
+        assert_eq!(
+            "Can be thrown\n\nmushrooms\n\n<Right-Click to use>",
+            throwable_desc(item_description)
+        );
+    }
+
+    #[test]
+    fn test_utility_desc() {
+        let item_description = "mushrooms";
+
+        assert_eq!(
+            "mushrooms\n\n<Right-Click to use>",
+            utility_desc(item_description)
+        );
+    }
+
+    #[test]
+    fn test_ingredient_desc() {
+        let item_description = "mushrooms";
+
+        assert_eq!(
+            "Crafting Ingredient\n\nmushrooms",
+            ingredient_desc(item_description)
+        );
+    }
+
+    #[test]
+    fn test_lantern_desc() {
+        let item_description = "mushrooms";
+
+        assert_eq!(
+            "Lantern\n\nmushrooms\n\n<Right-Click to use>",
+            lantern_desc(item_description)
+        );
+    }
+}