Fix typos

test-all.bat

@@ -26,7 +26,7 @@ cmd /c cargo build --release || goto error
 call :banner Debug build
 cmd /c cargo build || goto error
 
-call :banner Rust unit tests
+call :banner Rust unit and integration tests
 set RUST_BACKTRACE=1
 cmd /c cargo test --all || goto error
 
@@ -43,4 +43,4 @@ echo ===== %* =====
 exit /b 0
 
 :error
-exit /b 1
+exit /b 1

tests/runtime/mod.rs

@@ -42,7 +42,7 @@ pub fn instantiate<S: AsRef<str>>(
             &[bin_name.as_ref().to_owned(), ".".to_owned()],
             &[],
         )
-        .expect("instantiating wasi"),
+        .map_err(|e| format!("error instantiating WASI: {}", e))?,
     );
 
     // Compile and instantiating a wasm module.