test: multiply op

tests/arithmetic/mod.rs

@@ -0,0 +1 @@
+mod multiply;

tests/arithmetic/multiply.rs

@@ -0,0 +1,27 @@
+/// A simple function to multiply by 2 a i32 value and return the result
+#[test_log::test]
+pub fn multiply() {
+    use wasm::{validate, RuntimeInstance};
+
+    let wat = r#"
+    (module
+        (func (export "multiply") (param $x i32) (result i32)
+            local.get $x
+            i32.const 3
+            i32.mul)
+    )
+    "#;
+
+    let wasm_bytes = wat::parse_str(wat).unwrap();
+
+    let validation_info = validate(&wasm_bytes).expect("validation failed");
+
+    let mut instance = RuntimeInstance::new(&validation_info).expect("instantiation failed");
+
+    assert_eq!(33, instance.invoke_func(0, 11));
+    assert_eq!(0, instance.invoke_func(0, 0));
+    assert_eq!(-30, instance.invoke_func(0, -10));
+
+    assert_eq!(i32::MAX - 5, instance.invoke_func(0, i32::MAX-1));
+    assert_eq!(i32::MIN + 3, instance.invoke_func(0, i32::MIN+1));
+}

tests/lib.rs

@@ -0,0 +1 @@
+mod arithmetic;