De/serialize for HashSet<T, S>

serde_tests/tests/macros.rs

@@ -62,6 +62,14 @@ macro_rules! hashset {
             $(set.insert($value);)+
             set
         }
+    };
+    ($hasher:ident @ $($value:expr),+) => {
+        {
+            use std::hash::BuildHasherDefault;
+            let mut set = HashSet::with_hasher(BuildHasherDefault::<$hasher>::default());
+            $(set.insert($value);)+
+            set
+        }
     }
 }
 

serde_tests/tests/test_de.rs

@@ -287,6 +287,18 @@ declare_tests! {
             Token::TupleStructStart("Anything", Some(0)),
             Token::SeqEnd,
         ],
+        hashset![FnvHasher @ 1, 2, 3] => vec![
+            Token::SeqStart(Some(3)),
+                Token::SeqSep,
+                Token::I32(1),
+
+                Token::SeqSep,
+                Token::I32(2),
+
+                Token::SeqSep,
+                Token::I32(3),
+            Token::SeqEnd,
+        ],
     }
     test_vec {
         Vec::<isize>::new() => vec![

serde_tests/tests/test_ser.rs

@@ -1,4 +1,4 @@
-use std::collections::{BTreeMap, HashMap};
+use std::collections::{BTreeMap, HashMap, HashSet};
 use std::net;
 use std::path::{Path, PathBuf};
 use std::str;
@@ -147,6 +147,24 @@ declare_ser_tests! {
             Token::SeqEnd,
         ],
     }
+    test_hashset {
+        HashSet::<isize>::new() => &[
+            Token::SeqStart(Some(0)),
+            Token::SeqEnd,
+        ],
+        hashset![1] => &[
+            Token::SeqStart(Some(1)),
+                Token::SeqSep,
+                Token::I32(1),
+            Token::SeqEnd,
+        ],
+        hashset![FnvHasher @ 1] => &[
+            Token::SeqStart(Some(1)),
+                Token::SeqSep,
+                Token::I32(1),
+            Token::SeqEnd,
+        ],
+    }
     test_tuple {
         (1,) => &[
             Token::TupleStart(1),