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

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

        use wasmer_emscripten::{
            EmscriptenGlobals,
            generate_emscripten_env,
        };
        use wasmer_runtime_core::{
            backend::Compiler,
        };
        use wasmer_dev_utils::stdio::StdioCapturer;

        #[cfg(feature = "clif")]
        fn get_compiler() -> impl Compiler {
            use wasmer_clif_backend::CraneliftCompiler;
            CraneliftCompiler::new()
        }

        #[cfg(feature = "llvm")]
        fn get_compiler() -> impl Compiler {
            use wasmer_llvm_backend::LLVMCompiler;
            LLVMCompiler::new()
        }

        #[cfg(feature = "singlepass")]
        fn get_compiler() -> impl Compiler {
            use wasmer_singlepass_backend::SinglePassCompiler;
            SinglePassCompiler::new()
        }

        #[cfg(not(any(feature = "llvm", feature = "clif", feature = "singlepass")))]
        fn get_compiler() -> impl Compiler {
            panic!("compiler not specified, activate a compiler via features");
            use wasmer_clif_backend::CraneliftCompiler;
            CraneliftCompiler::new()
        }

        let wasm_bytes = include_bytes!($file);

        let module = wasmer_runtime_core::compile_with(&wasm_bytes[..], &get_compiler())
            .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(&module);
        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();

        wasmer_emscripten::run_emscripten_instance(
            &module,
            &mut instance,
            &mut emscripten_globals,
            $name,
            $args,
            None,
            vec![],
        ).expect("run_emscripten_instance finishes");

        let output = capturer.end().unwrap().0;
        let expected_output = include_str!($expected);

        assert!(
            output.contains(expected_output),
            "Output: `{}` does not contain expected output: `{}`",
            output,
            expected_output
        );
    }};
}

// pub fn assert_emscripten_output(wasm_bytes: &[u8], raw_expected_str: &str) {
//     use wasmer_clif_backend::CraneliftCompiler;
//     use wasmer_emscripten::{generate_emscripten_env, stdio::StdioCapturer, EmscriptenGlobals};

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

//     let mut emscripten_globals = EmscriptenGlobals::new(&module);
//     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();

//     let capturer = StdioCapturer::new();

//     wasmer_emscripten::run_emscripten_instance(&module, &mut instance, "test", vec![])
//         .expect("run_emscripten_instance finishes");

//     let raw_output_string = capturer.end().unwrap().0;

//     // trim the strings to avoid cross-platform line ending and white space issues
//     let output = raw_output_string.trim();
//     let expected_output = raw_expected_str.trim();

//     let contains_output = output.contains(expected_output);

//     assert!(
//         contains_output,
//         "Output: `{}` does not contain expected output: `{}`",
//         output, expected_output
//     );
// }