diff --git a/sys/lib/test/README.md b/sys/lib/test/README.md
new file mode 100644
index 000000000..c9cfed377
--- /dev/null
+++ b/sys/lib/test/README.md
@@ -0,0 +1,8 @@
+Development helpers and tests for libnethack.a and nethack.js.
+
+Copy these files to the NetHack root directory. Commands include:
+* run.sh wasm - rebuild makefiles and build nethack.js
+* run.sh runwasm - simple testing of nethack.js
+* run.sh lib - rebuild makefiles and build libnethack.a
+* run.sh runlib - simple testing of libnethack.a
+* run.sh bin - build the MacOS binary
\ No newline at end of file
diff --git a/sys/lib/test/libtest.c b/sys/lib/test/libtest.c
new file mode 100644
index 000000000..9b554b986
--- /dev/null
+++ b/sys/lib/test/libtest.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+
+/* external functions */
+int nhmain(int argc, char *argv[]);
+typedef void(*stub_callback_t)(const char *name, void *ret_ptr, const char *fmt, ...);
+void stub_graphics_set_callback(stub_callback_t cb);
+
+/* forward declarations */
+void window_cb(const char *name, void *ret_ptr, const char *fmt, ...);
+
+
+int main(int argc, char *argv[]) {
+    stub_graphics_set_callback(window_cb);
+    nhmain(argc, argv);
+}
+
+void window_cb(const char *name, void *ret_ptr, const char *fmt, ...) {
+    /* TODO -- see windowCallback below for hints */
+
+    /* DO SOMETHING HERE */
+    *ret_ptr = yourFunctionToRenderGraphics(name, va_list args);
+}
+
+
+
+
+#if 0
+function variadicCallback(name, retPtr, fmt, args) {
+    // console.log ("variadicCallback called...");
+    // console.log("typeof name", typeof name);
+    // console.log("typeof fmt", typeof fmt);
+    // console.log("typeof args", typeof args);
+    name = Module.UTF8ToString(name);
+    fmt = Module.UTF8ToString(fmt);
+    // console.log ("name:", name);
+    // console.log ("fmt:", fmt);
+    let argTypes = fmt.split("");
+    let retType = argTypes.shift();
+    // console.log ("arg count:", argTypes.length);
+    // console.log ("arg types:", argTypes);
+    // console.log ("ret type:", retType);
+
+    let jsArgs = [];
+    for (let i = 0; i < argTypes.length; i++) {
+        let ptr = args + (4*i);
+        let val = typeLookup(argTypes[i], ptr);
+        jsArgs.push(val);
+    }
+    console.log(`graphics callback: ${name} [${jsArgs}]`);
+    setReturn(retPtr, retType);
+}
+
+function setReturn(ptr, type, value = 0) {
+    switch (type) {
+    case "p":
+        throw new Error("not implemented");
+    case "s":
+        value=value?value:"(no value)";
+        var strPtr = Module.getValue(ptr, "i32");
+        Module.stringToUTF8(value, strPtr, 1024);
+        break;
+    case "i":
+        Module.setValue(ptr, value, "i32");
+        break;
+    case "c":
+        Module.setValue(ptr, value, "i8"); // 'Z'
+        break;
+    case "f":
+        // XXX: I'm not sure why 'double' works and 'float' doesn't
+        Module.setValue(ptr, value, "double");
+        break;
+    case "d":
+        Module.setValue(ptr, value, "double");
+        break;
+    case "v":
+        break;
+    default:
+        throw new Error("unknown type");
+    }
+}
+
+function typeLookup(type, ptr) {
+    switch(type) {
+    case "s": // string
+        return Module.UTF8ToString(Module.getValue(ptr, "*"));
+    case "p": // pointer
+        return Module.getValue(Module.getValue(ptr, "*"), "*");
+    case "c": // char
+        return String.fromCharCode(Module.getValue(Module.getValue(ptr, "*"), "i8"));
+    case "0": /* 2^0 = 1 byte */
+        return Module.getValue(Module.getValue(ptr, "*"), "i8");
+    case "1": /* 2^1 = 2 bytes */
+        return Module.getValue(Module.getValue(ptr, "*"), "i16");
+    case "2": /* 2^2 = 4 bytes */
+    case "i": // integer
+    case "n": // number
+        return Module.getValue(Module.getValue(ptr, "*"), "i32");
+    case "f": // float
+        return Module.getValue(Module.getValue(ptr, "*"), "float");
+    case "d": // double
+        return Module.getValue(Module.getValue(ptr, "*"), "double");
+    default:
+        throw new TypeError ("unknown type:" + type);
+    }
+}
+#endif /* 0 */
\ No newline at end of file
diff --git a/sys/lib/test/run.sh b/sys/lib/test/run.sh
new file mode 100755
index 000000000..5e2b36dfe
--- /dev/null
+++ b/sys/lib/test/run.sh
@@ -0,0 +1,40 @@
+#!/bin/bash -x
+
+if [ x$1 == "xlib" ]; then
+    echo Doing lib...
+    make spotless
+    cd sys/lib
+    ./setup.sh hints/macOS.2020
+    cd ../..
+    make
+fi
+
+if [ x$1 == "xrunlib" ]; then
+    LIBS="-Lsrc -lnethack -Llib/lua -llua -lm"
+    BADLIBS="-lncurses"
+    gcc -o nhlibtest libtest.c $LIBS $BADLIBS
+    ./nhlibtest
+fi
+
+if [ x$1 == "xwasm" ]; then
+    echo Doing wasm...
+    make spotless
+    cd sys/lib
+    ./setup.sh hints/wasm
+    cd ../..
+    make
+fi
+
+if [ x$1 == "xrunwasm" ]; then
+    node test.js
+fi
+
+if [ x$1 == "xbin" ]; then
+    echo Doing bin...
+    make spotless
+    cd sys/unix
+    ./setup.sh hints/macOS.2020
+    cd ../..
+    make
+fi
+
diff --git a/sys/lib/test/test.js b/sys/lib/test/test.js
new file mode 100644
index 000000000..146b56d8a
--- /dev/null
+++ b/sys/lib/test/test.js
@@ -0,0 +1,186 @@
+const util = require("util");
+
+// Emscripten Module config
+let Module = {
+    // noInitialRun: true,
+    onRuntimeInitialized: function () {
+        setGraphicsCallback();
+    },
+};
+
+var factory = require("./src/nethack.js");
+
+// load and run the module
+factory(Module);
+
+function setGraphicsCallback() {
+    console.log("setting callback function");
+    let cb = Module.addFunction(windowCallback, "viiii");
+
+    console.log("doing call");
+    Module.ccall(
+        "stub_graphics_set_callback", // C function name
+        null, // return type
+        ["number"], // arg types
+        [cb], // arg values
+        {async: true} // options
+    );
+
+    /* TODO: removeFunction */
+}
+
+function windowCallback(name, retPtr, fmt, args) {
+    // console.log ("variadicCallback called...");
+    // console.log("typeof name", typeof name);
+    // console.log("typeof fmt", typeof fmt);
+    // console.log("typeof args", typeof args);
+    name = Module.UTF8ToString(name);
+    fmt = Module.UTF8ToString(fmt);
+    // console.log ("name:", name);
+    // console.log ("fmt:", fmt);
+    let argTypes = fmt.split("");
+    let retType = argTypes.shift();
+    // console.log ("arg count:", argTypes.length);
+    // console.log ("arg types:", argTypes);
+    // console.log ("ret type:", retType);
+
+    let jsArgs = [];
+    for (let i = 0; i < argTypes.length; i++) {
+        let ptr = args + (4*i);
+        let val = typeLookup(argTypes[i], ptr);
+        jsArgs.push(val);
+    }
+    console.log(`graphics callback: ${name} [${jsArgs}]`);
+    let retVal = doGraphics(name, ... jsArgs);
+    setReturn(name, retPtr, retType, retVal);
+}
+
+function typeLookup(type, ptr) {
+    switch(type) {
+    case "s": // string
+        return Module.UTF8ToString(Module.getValue(ptr, "*"));
+    case "p": // pointer
+        ptr = Module.getValue(ptr, "*");
+        if(!ptr) return 0; // null pointer
+        return Module.getValue(ptr, "*");
+    case "c": // char
+        return String.fromCharCode(Module.getValue(Module.getValue(ptr, "*"), "i8"));
+    case "0": /* 2^0 = 1 byte */
+        return Module.getValue(Module.getValue(ptr, "*"), "i8");
+    case "1": /* 2^1 = 2 bytes */
+        return Module.getValue(Module.getValue(ptr, "*"), "i16");
+    case "2": /* 2^2 = 4 bytes */
+    case "i": // integer
+    case "n": // number
+        return Module.getValue(Module.getValue(ptr, "*"), "i32");
+    case "f": // float
+        return Module.getValue(Module.getValue(ptr, "*"), "float");
+    case "d": // double
+        return Module.getValue(Module.getValue(ptr, "*"), "double");
+    default:
+        throw new TypeError ("unknown type:" + type);
+    }
+}
+
+function setReturn(name, ptr, type, value = 0) {
+
+    switch (type) {
+    case "p":
+        throw new Error("not implemented");
+    case "s":
+        if(typeof value !== "string")
+            throw new TypeError(`expected ${name} return type to be string`);
+        value=value?value:"(no value)";
+        var strPtr = Module.getValue(ptr, "i32");
+        Module.stringToUTF8(value, strPtr, 1024);
+        break;
+    case "i":
+        if(typeof value !== "number" || !Number.isInteger(value))
+            throw new TypeError(`expected ${name} return type to be integer`);
+        Module.setValue(ptr, value, "i32");
+        break;
+    case "c":
+        if(typeof value !== "number" || value < 0 || value > 128)
+            throw new TypeError(`expected ${name} return type to be integer representing an ASCII character`);
+        Module.setValue(ptr, value, "i8");
+        break;
+    case "f":
+        if(typeof value !== "number" || isFloat(value))
+            throw new TypeError(`expected ${name} return type to be float`);
+        // XXX: I'm not sure why 'double' works and 'float' doesn't
+        Module.setValue(ptr, value, "double");
+        break;
+    case "d":
+        if(typeof value !== "number" || isFloat(value))
+            throw new TypeError(`expected ${name} return type to be float`);
+        Module.setValue(ptr, value, "double");
+        break;
+    case "v":
+        break;
+    default:
+        throw new Error("unknown type");
+    }
+
+    function isFloat(n){
+        return n === +n && n !== (n|0) && !Number.isInteger(n);
+    }
+}
+
+let winCount = 0;
+function doGraphics(name, ... args) {
+    switch(name) {
+    case "shim_create_nhwindow":
+        winCount++;
+        console.log("creating window", args, "returning", winCount);
+        return winCount;
+    case "shim_yn_function":
+    case "shim_message_menu":
+        return 121; // 'y'
+    case "shim_nhgetch":
+    case "shim_nh_poskey":
+        return 46;
+    default:
+        return 0;
+    }
+}
+
+// var Module = null;
+// factory(Module).then((ret) => {
+//     if(ret !== Module) {
+//         console.log("ret and Module are not the same");
+//     } else {
+//         console.log("ret and Module are the same");
+//     }
+//     // console.log("Module", util.inspect(Module, {depth: null, showHidden: true}));
+//     // TODO:
+//     // stub_graphics_set_callback();
+
+//     // options:
+//     // https://emscripten.org/docs/api_reference/module.html
+//     // logReadFiles
+//     // printWithColors
+//     // noInitialRun
+//     // onRuntimeInitialized
+//     console.log("doing run");
+//     // Module.run();
+
+//     // // main loop
+//     // console.log("creating function");
+//     // let fn = Module.addFunction(wasmCallback, "vii");
+
+//     // console.log("doing call");
+//     // Module.ccall(
+//     //     "mainloop", // C function name
+//     //     null, // return type
+//     //     ["number"], // arg types
+//     //     [fn], // arg values
+//     //     {async: true} // options
+//     // );
+//     // // TODO: removeFunction(fn)
+
+//     // var i = 0;
+//     // setInterval(function() {
+//     //     console.log("interval", i++);
+//     // },1000);
+// });
+