diff --git a/.gitignore b/.gitignore
index 7f7c00b..b8a823a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 /*.wasm
 /*.wat
+/.coverage
 /venv
 
 __pycache__
diff --git a/examples/buffer.html b/examples/buffer.html
index cf4e442..a9e46ee 100644
--- a/examples/buffer.html
+++ b/examples/buffer.html
@@ -11,38 +11,39 @@
 <div style="white-space: pre;" id="results"></div>
 
 
+<script type="text/javascript" src="./include.js"></script>
 <script type="text/javascript">
 let importObject = {};
 
-let results = document.getElementById('results');
-
-function log(txt)
+// Run a single test
+function run_test(app, str)
 {
-  let span = document.createElement('span');
-  span.innerHTML = txt;
-  results.appendChild(span);
-  let br = document.createElement('br');
-  results.appendChild(br);
+  let offset = alloc_bytes(app, str);
+
+  let js_chars = [];
+  let wasm_chars = [];
+  for(let idx = 0; idx < str.length; ++idx) {
+    js_chars.push(str.charCodeAt(idx));
+    wasm_chars.push(app.instance.exports.index(offset, idx));
+  }
+
+  let result = js_chars.every(function(value, index) { return value === wasm_chars[index]})
+
+  test_result(result, {
+    'summary': 'js_chars == wasm_chars, for "' + str + '"',
+    'attributes': {
+      'js_chars': js_chars,
+      'wasm_chars': wasm_chars,
+    }
+  });
 }
 
 WebAssembly.instantiateStreaming(fetch('buffer.wasm'), importObject)
   .then(app => {
-    // Allocate room within the memory of the WebAssembly class
-    let size = 8;
-
-    stdlib_types___alloc_bytes__ = app.instance.exports['stdlib.types.__alloc_bytes__']
-
-    let offset = stdlib_types___alloc_bytes__(size)
-    var i8arr = new Uint8Array(app.instance.exports.memory.buffer, offset + 4, size);
-
-    log('len(i8arr) = ' + app.instance.exports.length(offset));
-
-    //Fill it
-    for (var i = 0; i < size; i++) {
-      i8arr[i] = i + 5;
-      let from_wasm = app.instance.exports.index(offset, i);
-      log('i8arr[' + i + '] = ' + from_wasm);
-    }
+    run_test(app, '');
+    run_test(app, 'a');
+    run_test(app, 'Hello');
+    run_test(app, 'The quick brown fox jumps over the lazy dog');
   });
 </script>
 
diff --git a/examples/crc32.html b/examples/crc32.html
index 7bd228a..d867f5b 100644
--- a/examples/crc32.html
+++ b/examples/crc32.html
@@ -11,35 +11,80 @@
 <div style="white-space: pre;" id="results"></div>
 
 
+<script type="text/javascript" src="./include.js"></script>
 <script type="text/javascript">
 let importObject = {};
 
-let results = document.getElementById('results');
-
-function log(txt)
-{
-  let span = document.createElement('span');
-  span.innerHTML = txt;
-  results.appendChild(span);
-  let br = document.createElement('br');
-  results.appendChild(br);
+// Build up a JS version
+var makeCRCTable = function(){
+    var c;
+    var crcTable = [];
+    for(var n =0; n < 256; n++){
+        c = n;
+        for(var k =0; k < 8; k++){
+            c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
+        }
+        crcTable[n] = c;
+    }
+    return crcTable;
 }
 
+window.crcTable = makeCRCTable();
+
+var crc32_js = function(i8arr) {
+    var crcTable = window.crcTable;
+    var crc = 0 ^ (-1);
+
+    for (var i = 0; i < i8arr.length; i++ ) {
+        crc = (crc >>> 8) ^ crcTable[(crc ^ i8arr[i]) & 0xFF];
+    }
+
+    return (crc ^ (-1)) >>> 0;
+};
+
+// Run a single test
+function run_test(app, str)
+{
+  // Cast to Uint32 in Javascript
+  let crc32_wasm = (offset) => (app.instance.exports.crc32(offset) >>> 0);
+
+  let data = Uint8Array.from(str.split('').map(x => x.charCodeAt()));
+
+  offset = alloc_bytes(app, data);
+
+  // Run once to get the result
+  // For some reason, the JS version takes 2ms on the first run
+  let wasm_result = crc32_wasm(offset);
+  let js_result = crc32_js(data);
+
+  let wasm_time = run_times(100, () => crc32_wasm(offset));
+  let js_time = run_times(100, () => crc32_js(data));
+
+  test_result((js_result == wasm_result) && ((js_time == 0) || (wasm_time < js_time)), {
+    'summary': 'crc32(' + (str
+      ? (str.length < 64 ? '"' + str + '"' : '"' + str.substring(0, 64) + '..." (' + str.length + ')')
+      : '""') + ')',
+    'attributes': {
+      'str': str,
+      'wasm_result': wasm_result,
+      'wasm_time': wasm_time,
+      'js_result': js_result,
+      'js_time': js_time,
+      'speedup': (js_time == wasm_time) ? '-' : (js_time / wasm_time),
+    },
+  });
+}
+
+// Load WebAssembly, and run all tests
 WebAssembly.instantiateStreaming(fetch('crc32.wasm'), importObject)
   .then(app => {
-    // Allocate room within the memory of the WebAssembly class
-    stdlib_types___alloc_bytes__ = app.instance.exports['stdlib.types.__alloc_bytes__']
-
-    let offset0 = stdlib_types___alloc_bytes__(0);
-    let offset1 = stdlib_types___alloc_bytes__(1);
-
-    // Write into allocated memory
-    var i8arr0 = new Uint8Array(app.instance.exports.memory.buffer, offset0 + 4, 0);
-    var i8arr1 = new Uint8Array(app.instance.exports.memory.buffer, offset1 + 4, 1);
-    i8arr1[0] = 0x61;
-
-    log('crc32([' + i8arr0 + ']) = ' + app.instance.exports.crc32(offset0));
-    log('crc32([' + i8arr1 + ']) = ' + app.instance.exports.crc32(offset1));
+    run_test(app, "");
+    run_test(app, "a");
+    run_test(app, "Z");
+    run_test(app, "ab");
+    run_test(app, "abcdefghijklmnopqrstuvwxyz");
+    run_test(app, "The quick brown fox jumps over the lazy dog");
+    run_test(app, "The quick brown fox jumps over the lazy dog".repeat(1024)); // FIXME: Too slow :(
   });
 </script>
 
diff --git a/examples/crc32.py b/examples/crc32.py
index d531056..294b3c5 100644
--- a/examples/crc32.py
+++ b/examples/crc32.py
@@ -13,72 +13,39 @@
 #   return crc32;
 # }
 
-# Might be the wrong table
 _CRC32_Table: u32[256] = (
-    0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
-    0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
-    0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
-    0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
-    0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
-    0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
-    0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
-    0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
-    0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
-    0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
-    0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
-    0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
-    0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
-    0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
-    0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
-    0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
-    0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
-    0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
-    0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
-    0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
-    0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
-    0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
-    0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
-    0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
-    0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
-    0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
-    0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
-    0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
-    0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
-    0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
-    0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
-    0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
-    0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
-    0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
-    0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
-    0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
-    0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
-    0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
-    0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
-    0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
-    0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
-    0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
-    0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
-    0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
-    0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
-    0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
-    0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
-    0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
-    0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
-    0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
-    0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
-    0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
-    0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
-    0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
-    0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
-    0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
-    0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
-    0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
-    0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
-    0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
-    0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
-    0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
-    0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
-    0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351,
+    0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+    0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+    0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+    0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+    0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+    0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+    0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+    0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+    0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+    0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+    0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+    0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+    0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+    0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+    0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+    0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+    0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+    0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+    0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+    0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+    0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+    0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+    0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+    0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
+    0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
+    0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+    0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+    0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+    0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+    0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+    0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
 )
 
 def _crc32_f(crc: u32, byt: u8) -> u32:
diff --git a/examples/fib.html b/examples/fib.html
index 7a2bccb..35c6109 100644
--- a/examples/fib.html
+++ b/examples/fib.html
@@ -10,23 +10,44 @@
 <div style="white-space: pre;" id="results"></div>
 
 
+<script type="text/javascript" src="./include.js"></script>
 <script type="text/javascript">
 let importObject = {};
 
-let results = document.getElementById('results');
+function run_test(app, number, expected)
+{
+  let actual = app.instance.exports.fib(BigInt(number));
+  console.log(actual);
+
+  test_result(BigInt(expected) == actual, {
+    'summary': 'fib(' + number + ')',
+    'attributes': {
+      'expected': expected,
+      'actual': actual
+    },
+  });
+}
 
 WebAssembly.instantiateStreaming(fetch('fib.wasm'), importObject)
   .then(app => {
-    //  93:  7540113804746346429
+    //  92:  7540113804746346429
     // i64:  9223372036854775807
-    //  94: 19740274219868223167
-    for(let i = BigInt(1); i < 93; ++i) {
-      let span = document.createElement('span');
-      span.innerHTML = 'fib(' + i + ') = ' + app.instance.exports.fib(i);
-      results.appendChild(span);
-      let br = document.createElement('br');
-      results.appendChild(br);
-    }
+    //  93: 12200160415121876738
+
+    run_test(app,  1, '1');
+    run_test(app,  2, '1');
+    run_test(app,  3, '2');
+    run_test(app,  4, '3');
+    run_test(app, 10, '55');
+    run_test(app, 20, '6765');
+    run_test(app, 30, '832040');
+    run_test(app, 40, '102334155');
+    run_test(app, 50, '12586269025');
+    run_test(app, 60, '1548008755920');
+    run_test(app, 70, '190392490709135');
+    run_test(app, 80, '23416728348467685');
+    run_test(app, 90, '2880067194370816120');
+    run_test(app, 92, '7540113804746346429');
   });
 </script>
 
diff --git a/examples/fold.html b/examples/fold.html
index d47e580..0a9f93f 100644
--- a/examples/fold.html
+++ b/examples/fold.html
@@ -10,51 +10,37 @@
 
 <div style="white-space: pre;" id="results"></div>
 
-
+<script type="text/javascript" src="./include.js"></script>
 <script type="text/javascript">
-let importObject = {
-  'imports': {
-    'log': log,
-  }
-};
+let importObject = {};
 
-let results = document.getElementById('results');
-
-function log(txt)
+function run_test(app, data, expected)
 {
-  let span = document.createElement('span');
-  span.innerHTML = txt;
-  results.appendChild(span);
-  let br = document.createElement('br');
-  results.appendChild(br);
+  let offset = alloc_bytes(app, data);
+
+  let actual = app.instance.exports.foldl_u8_or_1(offset);
+
+  test_result(expected == actual, {
+    'summary': 'foldl(or, 1, [' + data + ']) == ' + expected,
+    'attributes': {
+      'data': data,
+      'expected': expected,
+      'offset': offset,
+      'actual': actual,
+    },
+  });
 }
 
+
 WebAssembly.instantiateStreaming(fetch('fold.wasm'), importObject)
   .then(app => {
-    stdlib_types___alloc_bytes__ = app.instance.exports['stdlib.types.__alloc_bytes__']
-
-    let offset0 = stdlib_types___alloc_bytes__(0);
-    let offset1 = stdlib_types___alloc_bytes__(1);
-    let offset2 = stdlib_types___alloc_bytes__(2);
-    let offset4 = stdlib_types___alloc_bytes__(4);
-
-    var i8arr0 = new Uint8Array(app.instance.exports.memory.buffer, offset0 + 4, 0);
-    var i8arr1 = new Uint8Array(app.instance.exports.memory.buffer, offset1 + 4, 1);
-    i8arr1[0] = 0x20;
-    var i8arr2 = new Uint8Array(app.instance.exports.memory.buffer, offset2 + 4, 2);
-    i8arr2[0] = 0x20;
-    i8arr2[1] = 0x10;
-    var i8arr4 = new Uint8Array(app.instance.exports.memory.buffer, offset4 + 4, 4);
-    i8arr4[0] = 0x20;
-    i8arr4[1] = 0x10;
-    i8arr4[2] = 0x08;
-    i8arr4[3] = 0x04;
-    i8arr4[4] = 0x02;
-
-    log('foldl(or, 1, [' + i8arr0 + ']) = ' + app.instance.exports.foldl_u8_or_1(offset0));
-    log('foldl(or, 1, [' + i8arr1 + ']) = ' + app.instance.exports.foldl_u8_or_1(offset1));
-    log('foldl(or, 1, [' + i8arr2 + ']) = ' + app.instance.exports.foldl_u8_or_1(offset2));
-    log('foldl(or, 1, [' + i8arr4 + ']) = ' + app.instance.exports.foldl_u8_or_1(offset4));
+    run_test(app, [], 1);
+    run_test(app, [0x20], 0x21);
+    run_test(app, [0x20, 0x10], 0x31);
+    run_test(app, [0x20, 0x10, 0x08], 0x39);
+    run_test(app, [0x20, 0x10, 0x08, 0x04], 0x3D);
+    run_test(app, [0x20, 0x10, 0x08, 0x04, 0x02], 0x3F);
+    run_test(app, [0x20, 0x10, 0x08, 0x04, 0x02, 0x01], 0x3F);
   });
 </script>
 
diff --git a/examples/imported.html b/examples/imported.html
index a69c02e..b0a6957 100644
--- a/examples/imported.html
+++ b/examples/imported.html
@@ -10,7 +10,7 @@
 
 <div style="white-space: pre;" id="results"></div>
 
-
+<script type="text/javascript" src="./include.js"></script>
 <script type="text/javascript">
 let importObject = {
   'imports': {
@@ -18,25 +18,41 @@ let importObject = {
   }
 };
 
-let results = document.getElementById('results');
+let log_result = [];
 
-function log(txt)
+function log(inp)
 {
-  let span = document.createElement('span');
-  span.innerHTML = txt;
-  results.appendChild(span);
-  let br = document.createElement('br');
-  results.appendChild(br);
+  log_result.push(inp);
+}
+
+function run_test(app, a, b)
+{
+  log_result = [];
+
+  let expected = a * b;
+
+  app.instance.exports.mult_and_log(a, b);
+
+  let actual = log_result[0];
+
+  test_result(expected == actual, {
+    'summary': 'mult_and_log(' + a + ', ' + b + ') == ' + expected,
+    'attributes': {
+      'a': a,
+      'b': b,
+      'expected': expected,
+      'actual': actual,
+    },
+  });
 }
 
 WebAssembly.instantiateStreaming(fetch('imported.wasm'), importObject)
   .then(app => {
-    console.log(WebAssembly.Module.imports(app.module));
-    app.instance.exports.run(1, 1);
-    app.instance.exports.run(3, 5);
-    app.instance.exports.run(8, 19);
-    app.instance.exports.run(12, 127);
-    app.instance.exports.run(79, 193);
+    run_test(app,  1,   1);
+    run_test(app,  3,   5);
+    run_test(app,  8,  19);
+    run_test(app, 12, 127);
+    run_test(app, 79, 193);
   });
 </script>
 
diff --git a/examples/imported.py b/examples/imported.py
index f5c2663..4083986 100644
--- a/examples/imported.py
+++ b/examples/imported.py
@@ -3,5 +3,5 @@ def log(no: i32) -> None:
     pass
 
 @exported
-def run(a: i32, b: i32) -> None:
+def mult_and_log(a: i32, b: i32) -> None:
     return log(a * b)
diff --git a/examples/include.js b/examples/include.js
new file mode 100644
index 0000000..bd93dcf
--- /dev/null
+++ b/examples/include.js
@@ -0,0 +1,64 @@
+function alloc_bytes(app, data)
+{
+  let stdlib_types___alloc_bytes__ = app.instance.exports['stdlib.types.__alloc_bytes__']
+
+  if( typeof data == 'string' ) {
+    // TODO: Unicode
+    data = Uint8Array.from(data.split('').map(x => x.charCodeAt()));
+  }
+
+  let offset = stdlib_types___alloc_bytes__(data.length);
+  let i8arr = new Uint8Array(app.instance.exports.memory.buffer, offset + 4, data.length);
+  i8arr.set(data);
+
+  return offset;
+}
+
+function run_times(times, callback)
+{
+  let sum = 0;
+  for(let idx = 0; idx < times; idx += 1) {
+    const t0 = performance.now();
+    callback();
+    const t1 = performance.now();
+    sum += t1 - t0;
+  }
+  console.log(sum);
+  return sum / times;
+}
+
+function test_result(is_pass, data)
+{
+  data = data || {};
+
+  let result_details = document.createElement('details');
+
+  let result_summary = document.createElement('summary');
+  result_summary.textContent =
+    (is_pass ? 'Test passed: ' : 'Test failed: ')
+    + (data.summary ?? '(no summary)')
+  ;
+  result_summary.setAttribute('style', is_pass ? 'background: green' : 'background: red');
+  result_details.appendChild(result_summary);
+
+  if( data.attributes ) {
+    let table = document.createElement('table');
+
+    Object.keys(data.attributes).forEach(idx => {
+      let td0 = document.createElement('td');
+      td0.textContent = idx;
+      let td1 = document.createElement('td');
+      td1.textContent = data.attributes[idx];
+
+      let tr = document.createElement('tr');
+      tr.appendChild(td0);
+      tr.appendChild(td1);
+
+      table.appendChild(tr);
+    });
+    result_details.append(table);
+  }
+
+  let results = document.getElementById('results');
+  results.appendChild(result_details);
+}