1 files changed, 117 insertions, 0 deletions
diff --git a/gfx/wr/peek-poke/tests/max_size.rs b/gfx/wr/peek-poke/tests/max_size.rs
new file mode 100644
index 0000000000..67cd1ca4a6
--- /dev/null
+++ b/gfx/wr/peek-poke/tests/max_size.rs
@@ -0,0 +1,117 @@
+// Copyright 2019 The Servo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(dead_code)]
+
+use peek_poke::{PeekPoke, Poke};
+use std::{marker::PhantomData, mem::size_of};
+
+#[test]
+fn test_numbers() {
+    assert_eq!(u8::max_size(), size_of::<u8>());
+    assert_eq!(u16::max_size(), size_of::<u16>());
+    assert_eq!(u32::max_size(), size_of::<u32>());
+    assert_eq!(u64::max_size(), size_of::<u64>());
+    assert_eq!(usize::max_size(), size_of::<usize>());
+    assert_eq!(i8::max_size(), size_of::<i8>());
+    assert_eq!(i16::max_size(), size_of::<i16>());
+    assert_eq!(i32::max_size(), size_of::<i32>());
+    assert_eq!(i64::max_size(), size_of::<i64>());
+    assert_eq!(isize::max_size(), size_of::<isize>());
+    // floating
+    assert_eq!(f32::max_size(), size_of::<f32>());
+    assert_eq!(f64::max_size(), size_of::<f64>());
+}
+
+#[test]
+fn test_bool() {
+    assert_eq!(bool::max_size(), size_of::<u8>());
+}
+
+#[test]
+fn test_option() {
+    assert_eq!(
+        Option::<usize>::max_size(),
+        <u8>::max_size() + <usize>::max_size()
+    );
+}
+
+#[test]
+fn test_fixed_size_array() {
+    assert_eq!(<[u32; 32]>::max_size(), 32 * size_of::<u32>());
+    assert_eq!(<[u64; 8]>::max_size(), 8 * size_of::<u64>());
+    assert_eq!(<[u8; 19]>::max_size(), 19 * size_of::<u8>());
+}
+
+#[test]
+fn test_tuple() {
+    assert_eq!(<(isize, )>::max_size(), size_of::<isize>());
+    assert_eq!(<(isize, isize, isize)>::max_size(), 3 * size_of::<isize>());
+    assert_eq!(<(isize, ())>::max_size(), size_of::<isize>());
+}
+
+#[test]
+fn test_basic_struct() {
+    #[derive(Debug, PeekPoke)]
+    struct Bar {
+        a: u32,
+        b: u32,
+        c: u32,
+    }
+
+    assert_eq!(<Bar>::max_size(), 3 * <u32>::max_size());
+}
+
+#[test]
+fn test_enum() {
+    #[derive(Clone, Copy, PeekPoke)]
+    enum TestEnum {
+        NoArg,
+        OneArg(usize),
+        Args(usize, usize),
+        AnotherNoArg,
+        StructLike { x: usize, y: f32 },
+    }
+    assert_eq!(
+        TestEnum::max_size(),
+        <u8>::max_size() + 2 * <usize>::max_size()
+    );
+}
+
+#[test]
+fn test_enum_cstyle() {
+    #[repr(u32)]
+    #[derive(Clone, Copy, PeekPoke)]
+    enum BorderStyle {
+        None = 0,
+        Solid = 1,
+        Double = 2,
+        Dotted = 3,
+        Dashed = 4,
+        Hidden = 5,
+        Groove = 6,
+        Ridge = 7,
+        Inset = 8,
+        Outset = 9,
+    }
+    assert_eq!(BorderStyle::max_size(), <u8>::max_size());
+}
+
+#[test]
+fn test_phantom_data() {
+    struct Bar;
+    #[derive(PeekPoke)]
+    struct Foo {
+        x: u32,
+        y: u32,
+        _marker: PhantomData<Bar>,
+    }
+    assert_eq!(Foo::max_size(), 2 * size_of::<u32>())
+}