1 files changed, 123 insertions, 0 deletions
diff --git a/third_party/rust/plain/src/tests.rs b/third_party/rust/plain/src/tests.rs
new file mode 100644
index 0000000000..7ab1c3753e
--- /dev/null
+++ b/third_party/rust/plain/src/tests.rs
@@ -0,0 +1,123 @@
+
+
+#![allow(dead_code)]
+
+use ::*;
+use core::mem;
+
+#[repr(C)]
+#[derive(Debug, Default, Copy, Eq, Clone, PartialEq)]
+struct Dummy1 {
+    field1: u64,
+    field2: u32,
+    field3: u16,
+    field4: u8,
+    field5: u8,
+}
+
+unsafe impl Plain for Dummy1 {}
+
+#[repr(C)]
+#[derive(Debug, Default, Copy, Eq, Clone, PartialEq)]
+struct Dummy2 {
+    field1: u8,
+    field2: u8,
+    field3: u16,
+    field4: u32,
+    field5: u64,
+}
+
+unsafe impl Plain for Dummy2 {}
+
+fn as_bytes<T: ?Sized>(r: &T) -> &[u8] {
+    unsafe { methods::as_bytes(r) }
+}
+
+fn as_mut_bytes<T: Plain + ?Sized>(r: &mut T) -> &mut [u8] {
+    unsafe { methods::as_mut_bytes(r) }
+}
+
+#[test]
+fn one_too_short() {
+    let b = vec![0u8; mem::size_of::<Dummy1>() - 1];
+
+    let r = Dummy1::from_bytes(&b);
+    assert!(r == Err(Error::TooShort));
+}
+
+#[test]
+fn unaligned() {
+    let b = vec![0u8; mem::size_of::<Dummy1>() + 1];
+    let b = &b[1..];
+
+    let r = Dummy1::from_bytes(&b);
+    assert!(r == Err(Error::BadAlignment));
+}
+
+#[test]
+fn copy_test() {
+    let t1 = Dummy1 {
+        field1: 0xaaaaaaaaaaaaaaaau64,
+        field2: 0xbbbbbbbbu32,
+        field3: 0xccccu16,
+        field4: 0xddu8,
+        field5: 0xeeu8,
+    };
+
+    let mut t2 = Dummy2::default();
+
+    assert!(t2.copy_from_bytes(as_bytes(&t1)) == Ok(()));
+
+    assert!(t2.field1 == 0xaau8);
+    assert!(t2.field2 == 0xaau8);
+    assert!(t2.field3 == 0xaaaau16);
+    assert!(t2.field4 == 0xaaaaaaaau32);
+    assert!(t2.field5 == 0xbbbbbbbbccccddeeu64 || t2.field5 == 0xeeddccccbbbbbbbbu64);
+
+    let sz = mem::size_of::<Dummy2>();
+    assert!(t2.copy_from_bytes(&as_bytes(&t1)[..sz - 1]) == Err(Error::TooShort));
+}
+
+#[test]
+fn basic_function() {
+    let t1 = Dummy1 {
+        field1: 0xaaaaaaaaaaaaaaaau64,
+        field2: 0xbbbbbbbbu32,
+        field3: 0xccccu16,
+        field4: 0xddu8,
+        field5: 0xeeu8,
+    };
+
+    let r1: &Dummy2 = from_bytes(as_bytes(&t1)).unwrap();
+
+    assert!(r1.field1 == 0xaau8);
+    assert!(r1.field2 == 0xaau8);
+    assert!(r1.field3 == 0xaaaau16);
+    assert!(r1.field4 == 0xaaaaaaaau32);
+    assert!(r1.field5 == 0xbbbbbbbbccccddeeu64 || r1.field5 == 0xeeddccccbbbbbbbbu64);
+
+    let r2 = as_bytes(r1);
+    assert!(r2.len() == mem::size_of::<Dummy1>());
+    assert!(r2[5] == 0xaa);
+
+    let size = r2.len();
+    let r3 = as_bytes(r2);
+    assert!(r3.len() == size);
+
+    let r4 = Dummy1::from_bytes(r3).unwrap();
+
+    let r5 = from_bytes::<Dummy2>(as_bytes(r4)).unwrap();
+
+    {
+        let r6 = slice_from_bytes::<Dummy1>(as_bytes(r5)).unwrap();
+
+        assert!(r6.len() == 1);
+        assert!(t1 == r6[0]);
+    }
+
+    let r7 = slice_from_bytes::<u64>(as_bytes(r5)).unwrap();
+    assert!(r7.len() == 2);
+
+    assert!(r7[0] == 0xaaaaaaaaaaaaaaaau64);
+    assert!(r7[1] == 0xbbbbbbbbccccddeeu64 || r7[1] == 0xeeddccccbbbbbbbbu64);
+}