add test.ts

deno_test_wasm/test_wasm/build.sh

@@ -0,0 +1 @@
+cargo build --target wasm32-unknown-unknown

deno_test_wasm/test_wasm/src/lib.rs

@@ -7,6 +7,7 @@ pub extern "C" fn malloc(len: usize) -> *mut c_char {
     s.into_raw()
 }
 
+#[no_mangle]
 pub extern "C" fn to_uppercase(ptr: *mut c_char) -> *mut c_char {
     let s = unsafe { CString::from_raw(ptr) };
     let s2 = CString::new(s.to_string_lossy().to_uppercase()).unwrap();