Fix non-compiling tests

vulkano/src/buffer.rs

@@ -802,7 +802,7 @@ mod tests {
                                               &queue).unwrap();
 
         match BufferView::new(&buffer) {
-            BufferViewCreationError::WrongBufferUsage => (),
+            Err(BufferViewCreationError::WrongBufferUsage) => (),
             _ => panic!()
         }
     }

vulkano/src/format.rs

@@ -109,6 +109,10 @@ pub unsafe trait Data {
 }
 
 // TODO: that's just an example ; implement for all common data types
+unsafe impl Data for i8 {
+    #[inline]
+    fn ty() -> Format { Format::R8Sint }
+}
 unsafe impl Data for u8 {
     #[inline]
     fn ty() -> Format { Format::R8Uint }

vulkano/src/tests.rs

@@ -10,7 +10,7 @@ macro_rules! instance {
             engine_name: "vulkano tests", engine_version: 1
         };
 
-        match instance::Instance::new(Some(&app), &instance::Extensions::none(), None) {
+        match instance::Instance::new(Some(&app), &instance::InstanceExtensions::none(), None) {
             Ok(i) => i,
             Err(_) => return
         }