wasmer/lib/emscripten/tests/emtests/_common.rs

macro_rules! assert_emscripten_output {
    ($file:expr, $name:expr, $args:expr, $expected:expr) => {{

        use wasmer_clif_backend::CraneliftCompiler;
        use wasmer_emscripten::{
            EmscriptenGlobals,
            generate_emscripten_env,
            stdio::StdioCapturer
        };

        let wasm_bytes = include_bytes!($file);

        let module = wasmer_runtime_core::compile_with(&wasm_bytes[..], &CraneliftCompiler::new())
            .expect("WASM can't be compiled");

//        let module = compile(&wasm_bytes[..])
//            .map_err(|err| format!("Can't create the WebAssembly module: {}", err)).unwrap(); // NOTE: Need to figure what the unwrap is for ??

        let mut emscripten_globals = EmscriptenGlobals::new();
        let import_object = generate_emscripten_env(&mut emscripten_globals);

        let mut instance = module.instantiate(import_object)
            .map_err(|err| format!("Can't instantiate the WebAssembly module: {:?}", err)).unwrap(); // NOTE: Need to figure what the unwrap is for ??

         let capturer = StdioCapturer::new();

        instance.call("_main", &[]).map(|_o| ()).unwrap();
        // TODO handle start instance logic
        wasmer_emscripten::run_emscripten_instance(
            &module,
            &mut instance,
            $name,
            $args,
        );

         let output = capturer.end().unwrap().0;
         let expected_output = include_str!($expected);
         assert!(false, "Emscripten tests are mocked");
         assert!(
             output.contains(expected_output),
             "Output: `{}` does not contain expected output: `{}`",
             output,
             expected_output
         );
    }};
}