From b255613f3792ec6dc1c57876e59d95c33538b607 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Fri, 9 Aug 2019 12:24:09 -0400
Subject: Add tests for USB descriptor layout.

---
 .gitignore        |  1 +
 src/descriptor.rs | 28 ++++++++++++++++++++++++++++
 src/lib.rs        |  2 ++
 3 files changed, 31 insertions(+)
 mode change 100755 => 100644 src/lib.rs

diff --git a/.gitignore b/.gitignore
index 1d8e8c5..c4448c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+/target
 */target
 **/*.rs.bk
 Cargo.lock
diff --git a/src/descriptor.rs b/src/descriptor.rs
index 8461413..c0d3314 100644
--- a/src/descriptor.rs
+++ b/src/descriptor.rs
@@ -1,4 +1,5 @@
 #[derive(Clone, Copy, Debug)]
+#[repr(u8)]
 pub enum DescriptorType {
     Device = 1,
     Configuration = 2,
@@ -66,3 +67,30 @@ pub struct EndpointDescriptor {
     pub w_max_packet_size: u16,
     pub b_interval: u8,
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    use core::mem;
+
+    #[test]
+    fn device_descriptor_layout() {
+        assert_eq!(mem::size_of::<DeviceDescriptor>(), 18);
+    }
+
+    #[test]
+    fn configuration_descriptor_layout() {
+        assert_eq!(mem::size_of::<ConfigurationDescriptor>(), 9);
+    }
+
+    #[test]
+    fn interface_descriptor_layout() {
+        assert_eq!(mem::size_of::<InterfaceDescriptor>(), 9);
+    }
+
+    #[test]
+    fn endpoint_descriptor_layout() {
+        assert_eq!(mem::size_of::<EndpointDescriptor>(), 7);
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
old mode 100755
new mode 100644
index 551824a..742e02c
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,5 @@
+//! Traits for a hardware-agnostic USB host interface.
+
 #![no_std]
 
 mod descriptor;
-- 
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