1 files changed, 161 insertions, 0 deletions
diff --git a/library/core/tests/hash/mod.rs b/library/core/tests/hash/mod.rs
new file mode 100644
index 000000000..f7934d062
--- /dev/null
+++ b/library/core/tests/hash/mod.rs
@@ -0,0 +1,161 @@
+mod sip;
+
+use std::default::Default;
+use std::hash::{BuildHasher, Hash, Hasher};
+use std::ptr;
+use std::rc::Rc;
+
+struct MyHasher {
+    hash: u64,
+}
+
+impl Default for MyHasher {
+    fn default() -> MyHasher {
+        MyHasher { hash: 0 }
+    }
+}
+
+impl Hasher for MyHasher {
+    fn write(&mut self, buf: &[u8]) {
+        for byte in buf {
+            self.hash += *byte as u64;
+        }
+    }
+    fn write_str(&mut self, s: &str) {
+        self.write(s.as_bytes());
+        self.write_u8(0xFF);
+    }
+    fn finish(&self) -> u64 {
+        self.hash
+    }
+}
+
+#[test]
+fn test_writer_hasher() {
+    fn hash<T: Hash>(t: &T) -> u64 {
+        let mut s = MyHasher { hash: 0 };
+        t.hash(&mut s);
+        s.finish()
+    }
+
+    assert_eq!(hash(&()), 0);
+
+    assert_eq!(hash(&5_u8), 5);
+    assert_eq!(hash(&5_u16), 5);
+    assert_eq!(hash(&5_u32), 5);
+    assert_eq!(hash(&5_u64), 5);
+    assert_eq!(hash(&5_usize), 5);
+
+    assert_eq!(hash(&5_i8), 5);
+    assert_eq!(hash(&5_i16), 5);
+    assert_eq!(hash(&5_i32), 5);
+    assert_eq!(hash(&5_i64), 5);
+    assert_eq!(hash(&5_isize), 5);
+
+    assert_eq!(hash(&false), 0);
+    assert_eq!(hash(&true), 1);
+
+    assert_eq!(hash(&'a'), 97);
+
+    let s: &str = "a";
+    assert_eq!(hash(&s), 97 + 0xFF);
+    let s: Box<str> = String::from("a").into_boxed_str();
+    assert_eq!(hash(&s), 97 + 0xFF);
+    let s: Rc<&str> = Rc::new("a");
+    assert_eq!(hash(&s), 97 + 0xFF);
+    let cs: &[u8] = &[1, 2, 3];
+    assert_eq!(hash(&cs), 9);
+    let cs: Box<[u8]> = Box::new([1, 2, 3]);
+    assert_eq!(hash(&cs), 9);
+    let cs: Rc<[u8]> = Rc::new([1, 2, 3]);
+    assert_eq!(hash(&cs), 9);
+
+    let ptr = ptr::invalid::<i32>(5_usize);
+    assert_eq!(hash(&ptr), 5);
+
+    let ptr = ptr::invalid_mut::<i32>(5_usize);
+    assert_eq!(hash(&ptr), 5);
+
+    if cfg!(miri) {
+        // Miri cannot hash pointers
+        return;
+    }
+
+    let cs: &mut [u8] = &mut [1, 2, 3];
+    let ptr = cs.as_ptr();
+    let slice_ptr = cs as *const [u8];
+    assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64);
+
+    let slice_ptr = cs as *mut [u8];
+    assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64);
+}
+
+struct Custom {
+    hash: u64,
+}
+struct CustomHasher {
+    output: u64,
+}
+
+impl Hasher for CustomHasher {
+    fn finish(&self) -> u64 {
+        self.output
+    }
+    fn write(&mut self, _: &[u8]) {
+        panic!()
+    }
+    fn write_u64(&mut self, data: u64) {
+        self.output = data;
+    }
+}
+
+impl Default for CustomHasher {
+    fn default() -> CustomHasher {
+        CustomHasher { output: 0 }
+    }
+}
+
+impl Hash for Custom {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        state.write_u64(self.hash);
+    }
+}
+
+#[test]
+fn test_custom_state() {
+    fn hash<T: Hash>(t: &T) -> u64 {
+        let mut c = CustomHasher { output: 0 };
+        t.hash(&mut c);
+        c.finish()
+    }
+
+    assert_eq!(hash(&Custom { hash: 5 }), 5);
+}
+
+// FIXME: Instantiated functions with i128 in the signature is not supported in Emscripten.
+// See https://github.com/kripken/emscripten-fastcomp/issues/169
+#[cfg(not(target_os = "emscripten"))]
+#[test]
+fn test_indirect_hasher() {
+    let mut hasher = MyHasher { hash: 0 };
+    {
+        let mut indirect_hasher: &mut dyn Hasher = &mut hasher;
+        5u32.hash(&mut indirect_hasher);
+    }
+    assert_eq!(hasher.hash, 5);
+}
+
+#[test]
+fn test_build_hasher_object_safe() {
+    use std::collections::hash_map::{DefaultHasher, RandomState};
+
+    let _: &dyn BuildHasher<Hasher = DefaultHasher> = &RandomState::new();
+}
+
+// just tests by whether or not this compiles
+fn _build_hasher_default_impl_all_auto_traits<T>() {
+    use std::panic::{RefUnwindSafe, UnwindSafe};
+    fn all_auto_traits<T: Send + Sync + Unpin + UnwindSafe + RefUnwindSafe>() {}
+
+    all_auto_traits::<std::hash::BuildHasherDefault<T>>();
+}