rust: add tests for EvmcContainer

bindings/rust/evmc-vm/src/container.rs

@@ -30,8 +30,8 @@ impl<T: EvmcVm + Sized> EvmcContainer<T> {
     }
 
     /// Convert boxed self into an FFI pointer, surrendering ownership of the heap data.
-    pub unsafe fn into_ffi_pointer(boxed: Box<Self>) -> *const ::evmc_sys::evmc_instance {
+    pub unsafe fn into_ffi_pointer(boxed: Box<Self>) -> *mut ::evmc_sys::evmc_instance {
-        Box::into_raw(boxed) as *const ::evmc_sys::evmc_instance
+        Box::into_raw(boxed) as *mut ::evmc_sys::evmc_instance
     }
 }
 
@@ -45,3 +45,39 @@ where
         &self.vm
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{ExecutionContext, ExecutionResult};
+
+    struct TestVm {}
+    impl EvmcVm for TestVm {
+        fn init() -> Self {
+            TestVm {}
+        }
+        fn execute(&self, _code: &[u8], _context: &ExecutionContext) -> ExecutionResult {
+            ExecutionResult::failure()
+        }
+    }
+
+    #[test]
+    fn container_new() {
+        let instance = ::evmc_sys::evmc_instance {
+            abi_version: ::evmc_sys::EVMC_ABI_VERSION as i32,
+            name: std::ptr::null(),
+            version: std::ptr::null(),
+            destroy: None,
+            execute: None,
+            get_capabilities: None,
+            set_tracer: None,
+            set_option: None,
+        };
+
+        let container = EvmcContainer::<TestVm>::new(instance);
+
+        let ptr = unsafe { EvmcContainer::into_ffi_pointer(Box::new(container)) };
+
+        unsafe { EvmcContainer::<TestVm>::from_ffi_pointer(ptr) };
+    }
+}