Test out new interface api

crates/lang/tests/ui/contract/pass/interface-with-event.rs

@@ -0,0 +1,40 @@
+use ink_lang as ink;
+
+#[ink::interface]
+pub mod contract_interface {
+    #[ink(trait_definition)]
+    pub trait ContractInterface {
+        #[ink(constructor)]
+        fn constructor() -> Self;
+
+        #[ink(message)]
+        fn message(&self, value: bool) {}
+    }
+
+    #[ink(event)]
+    pub enum Event {
+        MessageInvoked { value: bool }
+    }
+}
+
+#[ink::contract]
+mod contract {
+    use super::contract_interface;
+
+    #[ink(storage)]
+    pub struct Contract {}
+
+    impl contract_interface::ContractInterface for Contract {
+        #[ink(constructor)]
+        fn constructor() -> Self {
+            Self {}
+        }
+
+        #[ink(message)]
+        fn message(&self, value: bool) {
+            self.env().emit_event(contract_interface::Event::MessageInvoked { value })
+        }
+    }
+}
+
+fn main() {}