tests: Add UI tests for ABI specific constructor rules

Author: davidsemakula

crates/ink/tests/ui/abi/all/fail/constructors-no-default.rs

@@ -0,0 +1,24 @@
+#![allow(unexpected_cfgs)]
+
+#[ink::contract]
+mod contract {
+    #[ink(storage)]
+    pub struct Contract {}
+
+    impl Contract {
+        #[ink(constructor)]
+        pub fn constructor_1() -> Self {
+            Self {}
+        }
+
+        #[ink(constructor)]
+        pub fn constructor_2() -> Self {
+            Self {}
+        }
+
+        #[ink(message)]
+        pub fn message(&self) {}
+    }
+}
+
+fn main() {}

crates/ink/tests/ui/abi/all/fail/constructors-no-default.stderr

@@ -0,0 +1,9 @@
+error: One constructor used for Solidity ABI encoded instantiation must be annotated with the `default` attribute argument in "all" ABI mode
+  --> tests/ui/abi/all/fail/constructors-no-default.rs:4:1
+   |
+4  | / mod contract {
+5  | |     #[ink(storage)]
+6  | |     pub struct Contract {}
+...  |
+22 | | }
+   | |_^

crates/ink/tests/ui/abi/all/pass/constructors-with-default.rs

@@ -0,0 +1,24 @@
+#![allow(unexpected_cfgs)]
+
+#[ink::contract]
+mod contract {
+    #[ink(storage)]
+    pub struct Contract {}
+
+    impl Contract {
+        #[ink(constructor, default)]
+        pub fn constructor_1() -> Self {
+            Self {}
+        }
+
+        #[ink(constructor)]
+        pub fn constructor_2() -> Self {
+            Self {}
+        }
+
+        #[ink(message)]
+        pub fn message(&self) {}
+    }
+}
+
+fn main() {}

crates/ink/tests/ui/abi/sol/fail/constructors.rs

@@ -0,0 +1,24 @@
+#![allow(unexpected_cfgs)]
+
+#[ink::contract]
+mod contract {
+    #[ink(storage)]
+    pub struct Contract {}
+
+    impl Contract {
+        #[ink(constructor)]
+        pub fn constructor_1() -> Self {
+            Self {}
+        }
+
+        #[ink(constructor)]
+        pub fn constructor_2() -> Self {
+            Self {}
+        }
+
+        #[ink(message)]
+        pub fn message(&self) {}
+    }
+}
+
+fn main() {}

crates/ink/tests/ui/abi/sol/fail/constructors.stderr

@@ -0,0 +1,9 @@
+error: multiple constructors are not supported in Solidity ABI compatibility mode
+  --> tests/ui/abi/sol/fail/constructors.rs:4:1
+   |
+4  | / mod contract {
+5  | |     #[ink(storage)]
+6  | |     pub struct Contract {}
+...  |
+22 | | }
+   | |_^

crates/ink/tests/ui/abi/sol/pass/constructor.rs

@@ -0,0 +1,19 @@
+#![allow(unexpected_cfgs)]
+
+#[ink::contract]
+mod contract {
+    #[ink(storage)]
+    pub struct Contract {}
+
+    impl Contract {
+        #[ink(constructor)]
+        pub fn constructor() -> Self {
+            Self {}
+        }
+
+        #[ink(message)]
+        pub fn message(&self) {}
+    }
+}
+
+fn main() {}