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-rw-r--r--vendor/crossbeam-utils/tests/cache_padded.rs113
1 files changed, 113 insertions, 0 deletions
diff --git a/vendor/crossbeam-utils/tests/cache_padded.rs b/vendor/crossbeam-utils/tests/cache_padded.rs
new file mode 100644
index 0000000..86e9a77
--- /dev/null
+++ b/vendor/crossbeam-utils/tests/cache_padded.rs
@@ -0,0 +1,113 @@
+use std::cell::Cell;
+use std::mem;
+
+use crossbeam_utils::CachePadded;
+
+#[test]
+fn default() {
+ let x: CachePadded<u64> = Default::default();
+ assert_eq!(*x, 0);
+}
+
+#[test]
+fn store_u64() {
+ let x: CachePadded<u64> = CachePadded::new(17);
+ assert_eq!(*x, 17);
+}
+
+#[test]
+fn store_pair() {
+ let x: CachePadded<(u64, u64)> = CachePadded::new((17, 37));
+ assert_eq!(x.0, 17);
+ assert_eq!(x.1, 37);
+}
+
+#[test]
+fn distance() {
+ let arr = [CachePadded::new(17u8), CachePadded::new(37u8)];
+ let a = &*arr[0] as *const u8;
+ let b = &*arr[1] as *const u8;
+ let align = mem::align_of::<CachePadded<()>>();
+ assert!(align >= 32);
+ assert_eq!(unsafe { a.add(align) }, b);
+}
+
+#[test]
+fn different_sizes() {
+ CachePadded::new(17u8);
+ CachePadded::new(17u16);
+ CachePadded::new(17u32);
+ CachePadded::new([17u64; 0]);
+ CachePadded::new([17u64; 1]);
+ CachePadded::new([17u64; 2]);
+ CachePadded::new([17u64; 3]);
+ CachePadded::new([17u64; 4]);
+ CachePadded::new([17u64; 5]);
+ CachePadded::new([17u64; 6]);
+ CachePadded::new([17u64; 7]);
+ CachePadded::new([17u64; 8]);
+}
+
+#[test]
+fn large() {
+ let a = [17u64; 9];
+ let b = CachePadded::new(a);
+ assert!(mem::size_of_val(&a) <= mem::size_of_val(&b));
+}
+
+#[test]
+fn debug() {
+ assert_eq!(
+ format!("{:?}", CachePadded::new(17u64)),
+ "CachePadded { value: 17 }"
+ );
+}
+
+#[test]
+fn drops() {
+ let count = Cell::new(0);
+
+ struct Foo<'a>(&'a Cell<usize>);
+
+ impl<'a> Drop for Foo<'a> {
+ fn drop(&mut self) {
+ self.0.set(self.0.get() + 1);
+ }
+ }
+
+ let a = CachePadded::new(Foo(&count));
+ let b = CachePadded::new(Foo(&count));
+
+ assert_eq!(count.get(), 0);
+ drop(a);
+ assert_eq!(count.get(), 1);
+ drop(b);
+ assert_eq!(count.get(), 2);
+}
+
+#[allow(clippy::clone_on_copy)] // This is intentional.
+#[test]
+fn clone() {
+ let a = CachePadded::new(17);
+ let b = a.clone();
+ assert_eq!(*a, *b);
+}
+
+#[test]
+fn runs_custom_clone() {
+ let count = Cell::new(0);
+
+ struct Foo<'a>(&'a Cell<usize>);
+
+ impl<'a> Clone for Foo<'a> {
+ fn clone(&self) -> Foo<'a> {
+ self.0.set(self.0.get() + 1);
+ Foo::<'a>(self.0)
+ }
+ }
+
+ let a = CachePadded::new(Foo(&count));
+ let _ = a.clone();
+
+ assert_eq!(count.get(), 1);
+}