Add a test after parsing a route to ensure it doesn't contain duplica…

…te parameter names

src/lib.rs

@@ -3,6 +3,7 @@ use nfa::NFA;
 use std::cmp::Ordering;
 use std::collections::btree_map;
 use std::collections::BTreeMap;
+use std::collections::HashSet;
 use std::ops::Index;
 
 pub mod nfa;
@@ -173,6 +174,12 @@ impl<T> Router<T> {
                 metadata.statics += 1;
             }
         }
+        let mut hashes = HashSet::new();
+        for name in metadata.param_names.iter() {
+            if !hashes.insert(name.to_string()) {
+                panic!("Duplicate name '{}' in route {}", name.to_string(), &route);
+            }
+        }
 
         nfa.acceptance(state);
         nfa.metadata(state, metadata);
@@ -362,6 +369,41 @@ fn unnamed_parameters() {
     assert_eq!(m.params, params("bar", "test"));
 }
 
+#[test]
+#[should_panic]
+fn duplicate_named_parameter() {
+    let mut router = Router::new();
+    router.add("/foo/:bar/:bar", "test".to_string());
+}
+
+#[test]
+#[should_panic]
+fn duplicate_star_parameter() {
+    let mut router = Router::new();
+    router.add("/foo/*bar/*bar", "test".to_string());
+}
+
+#[test]
+#[should_panic]
+fn duplicate_mixed_parameter() {
+    let mut router = Router::new();
+    router.add("/foo/*bar/:bar", "test".to_string());
+}
+
+#[test]
+#[should_panic]
+fn duplicate_mixed_reversed_parameter() {
+    let mut router = Router::new();
+    router.add("/foo/:bar/*bar", "test".to_string());
+}
+
+#[test]
+#[should_panic]
+fn duplicate_separated_parameter() {
+    let mut router = Router::new();
+    router.add("/foo/:bar/bleg/:bar", "test".to_string());
+}
+
 #[allow(dead_code)]
 fn params(key: &str, val: &str) -> Params {
     let mut map = Params::new();