diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0f58ab35..278c5ec2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
   
 ### **HEAD -> main** 2022/08/31 mandic00@live.com
 
+- minor bug fixes and increased test coverage
 - extend release tests
 - add model load exception handling
 - add softwarekernels config option
diff --git a/TODO.md b/TODO.md
index 0c974544..a3e2af7f 100644
--- a/TODO.md
+++ b/TODO.md
@@ -78,9 +78,13 @@ Enable via `about:config` -> `gfx.offscreencanvas.enabled`
 - Fix `human.match` when using mixed descriptor lengths  
 - Fix **WASM** feature detection issue in TFJS with Edge/Chromium  
   Example: `console.log(human.env.wasm)`  
-- Increased test coverage  
-  **NodeJS**: Run using: `npm run test`  
-  **Browser**: Run using: `demo/browser.html`  
+- Increased **NodeJS** test coverage  
+  Run using: `npm run test`  
+  Runs tests for `tfjs-node`, `tfjs-node-gpu` and `wasm`  
+- Increased **Browser** test coverage  
+  Run using: `demo/browser.html`  
+  Runs tests for `webgl`, `humangl`, `webgpu` and `wasm`  
+  Runs tests for ESM and IIFE versions of library  
 - Increase availability of alternative models  
   See `models/model.json` for full list  
 - Update profiling methods in `human.profile()`  
diff --git a/package.json b/package.json
index 2c14939b..6f9aedf5 100644
--- a/package.json
+++ b/package.json
@@ -97,7 +97,7 @@
     "rimraf": "^3.0.2",
     "seedrandom": "^3.0.5",
     "tslib": "^2.4.0",
-    "typedoc": "0.23.12",
+    "typedoc": "0.23.13",
     "typescript": "4.8.2"
   }
 }
diff --git a/test/build.log b/test/build.log
index 1b4ebb63..e0b8805d 100644
--- a/test/build.log
+++ b/test/build.log
@@ -1,39 +1,39 @@
-2022-08-31 18:30:05 DATA:  Build {"name":"@vladmandic/human","version":"2.9.4"} 
-2022-08-31 18:30:05 INFO:  Application: {"name":"@vladmandic/human","version":"2.9.4"} 
-2022-08-31 18:30:05 INFO:  Environment: {"profile":"production","config":".build.json","package":"package.json","tsconfig":true,"eslintrc":true,"git":true} 
-2022-08-31 18:30:05 INFO:  Toolchain: {"build":"0.7.11","esbuild":"0.15.6","typescript":"4.8.2","typedoc":"0.23.12","eslint":"8.23.0"} 
-2022-08-31 18:30:05 INFO:  Build: {"profile":"production","steps":["clean","compile","typings","typedoc","lint","changelog"]} 
-2022-08-31 18:30:05 STATE: Clean: {"locations":["dist/*","types/lib/*","typedoc/*"]} 
-2022-08-31 18:30:05 STATE: Compile: {"name":"tfjs/nodejs/cpu","format":"cjs","platform":"node","input":"tfjs/tf-node.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":159,"outputBytes":608} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"human/nodejs/cpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node.js","files":75,"inputBytes":655767,"outputBytes":308629} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"tfjs/nodejs/gpu","format":"cjs","platform":"node","input":"tfjs/tf-node-gpu.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":167,"outputBytes":612} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"human/nodejs/gpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-gpu.js","files":75,"inputBytes":655771,"outputBytes":308633} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"tfjs/nodejs/wasm","format":"cjs","platform":"node","input":"tfjs/tf-node-wasm.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":206,"outputBytes":664} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"human/nodejs/wasm","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-wasm.js","files":75,"inputBytes":655823,"outputBytes":308683} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"tfjs/browser/version","format":"esm","platform":"browser","input":"tfjs/tf-version.ts","output":"dist/tfjs.version.js","files":1,"inputBytes":1125,"outputBytes":358} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"tfjs/browser/esm/nobundle","format":"esm","platform":"browser","input":"tfjs/tf-browser.ts","output":"dist/tfjs.esm.js","files":2,"inputBytes":1088,"outputBytes":583} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"human/browser/esm/nobundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm-nobundle.js","files":75,"inputBytes":655742,"outputBytes":307503} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"tfjs/browser/esm/custom","format":"esm","platform":"browser","input":"tfjs/tf-custom.ts","output":"dist/tfjs.esm.js","files":11,"inputBytes":1344,"outputBytes":2821914} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"human/browser/iife/bundle","format":"iife","platform":"browser","input":"src/human.ts","output":"dist/human.js","files":75,"inputBytes":3477073,"outputBytes":1687675} 
-2022-08-31 18:30:06 STATE: Compile: {"name":"human/browser/esm/bundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm.js","files":75,"inputBytes":3477073,"outputBytes":3108312} 
-2022-08-31 18:30:10 STATE: Typings: {"input":"src/human.ts","output":"types/lib","files":30} 
-2022-08-31 18:30:12 STATE: TypeDoc: {"input":"src/human.ts","output":"typedoc","objects":77,"generated":true} 
-2022-08-31 18:30:12 STATE: Compile: {"name":"demo/typescript","format":"esm","platform":"browser","input":"demo/typescript/index.ts","output":"demo/typescript/index.js","files":1,"inputBytes":6714,"outputBytes":3134} 
-2022-08-31 18:30:12 STATE: Compile: {"name":"demo/faceid","format":"esm","platform":"browser","input":"demo/faceid/index.ts","output":"demo/faceid/index.js","files":2,"inputBytes":15488,"outputBytes":7788} 
-2022-08-31 18:30:23 STATE: Lint: {"locations":["*.json","src/**/*.ts","test/**/*.js","demo/**/*.js"],"files":112,"errors":0,"warnings":0} 
-2022-08-31 18:30:23 STATE: ChangeLog: {"repository":"https://github.com/vladmandic/human","branch":"main","output":"CHANGELOG.md"} 
-2022-08-31 18:30:23 STATE: Copy: {"input":"tfjs/tfjs.esm.d.ts"} 
-2022-08-31 18:30:23 INFO:  Done... 
-2022-08-31 18:30:24 STATE: API-Extractor: {"succeeeded":true,"errors":0,"warnings":198} 
-2022-08-31 18:30:24 STATE: Copy: {"input":"types/human.d.ts"} 
-2022-08-31 18:30:24 INFO:  Analyze models: {"folders":8,"result":"models/models.json"} 
-2022-08-31 18:30:24 STATE: Models {"folder":"./models","models":13} 
-2022-08-31 18:30:24 STATE: Models {"folder":"../human-models/models","models":42} 
-2022-08-31 18:30:24 STATE: Models {"folder":"../blazepose/model/","models":4} 
-2022-08-31 18:30:24 STATE: Models {"folder":"../anti-spoofing/model","models":1} 
-2022-08-31 18:30:24 STATE: Models {"folder":"../efficientpose/models","models":3} 
-2022-08-31 18:30:24 STATE: Models {"folder":"../insightface/models","models":5} 
-2022-08-31 18:30:24 STATE: Models {"folder":"../movenet/models","models":3} 
-2022-08-31 18:30:24 STATE: Models {"folder":"../nanodet/models","models":4} 
-2022-08-31 18:30:24 STATE: Models: {"count":57,"totalSize":383017442} 
-2022-08-31 18:30:24 INFO:  Human Build complete... {"logFile":"test/build.log"} 
+2022-09-01 09:05:06 DATA:  Build {"name":"@vladmandic/human","version":"2.9.4"} 
+2022-09-01 09:05:06 INFO:  Application: {"name":"@vladmandic/human","version":"2.9.4"} 
+2022-09-01 09:05:06 INFO:  Environment: {"profile":"production","config":".build.json","package":"package.json","tsconfig":true,"eslintrc":true,"git":true} 
+2022-09-01 09:05:06 INFO:  Toolchain: {"build":"0.7.11","esbuild":"0.15.6","typescript":"4.8.2","typedoc":"0.23.13","eslint":"8.23.0"} 
+2022-09-01 09:05:06 INFO:  Build: {"profile":"production","steps":["clean","compile","typings","typedoc","lint","changelog"]} 
+2022-09-01 09:05:06 STATE: Clean: {"locations":["dist/*","types/lib/*","typedoc/*"]} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"tfjs/nodejs/cpu","format":"cjs","platform":"node","input":"tfjs/tf-node.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":159,"outputBytes":608} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"human/nodejs/cpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node.js","files":75,"inputBytes":655767,"outputBytes":308629} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"tfjs/nodejs/gpu","format":"cjs","platform":"node","input":"tfjs/tf-node-gpu.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":167,"outputBytes":612} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"human/nodejs/gpu","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-gpu.js","files":75,"inputBytes":655771,"outputBytes":308633} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"tfjs/nodejs/wasm","format":"cjs","platform":"node","input":"tfjs/tf-node-wasm.ts","output":"dist/tfjs.esm.js","files":1,"inputBytes":206,"outputBytes":664} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"human/nodejs/wasm","format":"cjs","platform":"node","input":"src/human.ts","output":"dist/human.node-wasm.js","files":75,"inputBytes":655823,"outputBytes":308683} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"tfjs/browser/version","format":"esm","platform":"browser","input":"tfjs/tf-version.ts","output":"dist/tfjs.version.js","files":1,"inputBytes":1125,"outputBytes":358} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"tfjs/browser/esm/nobundle","format":"esm","platform":"browser","input":"tfjs/tf-browser.ts","output":"dist/tfjs.esm.js","files":2,"inputBytes":1088,"outputBytes":583} 
+2022-09-01 09:05:06 STATE: Compile: {"name":"human/browser/esm/nobundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm-nobundle.js","files":75,"inputBytes":655742,"outputBytes":307503} 
+2022-09-01 09:05:07 STATE: Compile: {"name":"tfjs/browser/esm/custom","format":"esm","platform":"browser","input":"tfjs/tf-custom.ts","output":"dist/tfjs.esm.js","files":11,"inputBytes":1344,"outputBytes":2821914} 
+2022-09-01 09:05:07 STATE: Compile: {"name":"human/browser/iife/bundle","format":"iife","platform":"browser","input":"src/human.ts","output":"dist/human.js","files":75,"inputBytes":3477073,"outputBytes":1687675} 
+2022-09-01 09:05:07 STATE: Compile: {"name":"human/browser/esm/bundle","format":"esm","platform":"browser","input":"src/human.ts","output":"dist/human.esm.js","files":75,"inputBytes":3477073,"outputBytes":3108312} 
+2022-09-01 09:05:11 STATE: Typings: {"input":"src/human.ts","output":"types/lib","files":30} 
+2022-09-01 09:05:13 STATE: TypeDoc: {"input":"src/human.ts","output":"typedoc","objects":77,"generated":true} 
+2022-09-01 09:05:13 STATE: Compile: {"name":"demo/typescript","format":"esm","platform":"browser","input":"demo/typescript/index.ts","output":"demo/typescript/index.js","files":1,"inputBytes":6714,"outputBytes":3134} 
+2022-09-01 09:05:13 STATE: Compile: {"name":"demo/faceid","format":"esm","platform":"browser","input":"demo/faceid/index.ts","output":"demo/faceid/index.js","files":2,"inputBytes":15488,"outputBytes":7788} 
+2022-09-01 09:05:24 STATE: Lint: {"locations":["*.json","src/**/*.ts","test/**/*.js","demo/**/*.js"],"files":113,"errors":0,"warnings":0} 
+2022-09-01 09:05:24 STATE: ChangeLog: {"repository":"https://github.com/vladmandic/human","branch":"main","output":"CHANGELOG.md"} 
+2022-09-01 09:05:24 STATE: Copy: {"input":"tfjs/tfjs.esm.d.ts"} 
+2022-09-01 09:05:24 INFO:  Done... 
+2022-09-01 09:05:24 STATE: API-Extractor: {"succeeeded":true,"errors":0,"warnings":198} 
+2022-09-01 09:05:24 STATE: Copy: {"input":"types/human.d.ts"} 
+2022-09-01 09:05:24 INFO:  Analyze models: {"folders":8,"result":"models/models.json"} 
+2022-09-01 09:05:24 STATE: Models {"folder":"./models","models":13} 
+2022-09-01 09:05:24 STATE: Models {"folder":"../human-models/models","models":42} 
+2022-09-01 09:05:24 STATE: Models {"folder":"../blazepose/model/","models":4} 
+2022-09-01 09:05:24 STATE: Models {"folder":"../anti-spoofing/model","models":1} 
+2022-09-01 09:05:24 STATE: Models {"folder":"../efficientpose/models","models":3} 
+2022-09-01 09:05:24 STATE: Models {"folder":"../insightface/models","models":5} 
+2022-09-01 09:05:24 STATE: Models {"folder":"../movenet/models","models":3} 
+2022-09-01 09:05:24 STATE: Models {"folder":"../nanodet/models","models":4} 
+2022-09-01 09:05:25 STATE: Models: {"count":57,"totalSize":383017442} 
+2022-09-01 09:05:25 INFO:  Human Build complete... {"logFile":"test/build.log"} 
diff --git a/test/test-browser-esm.js b/test/test-browser-esm.js
index 6d5b83ad..5c78226c 100644
--- a/test/test-browser-esm.js
+++ b/test/test-browser-esm.js
@@ -71,7 +71,7 @@ async function testDefault(title, testConfig = {}) {
   human.reset();
   res = human.validate(testConfig); // validate
   if (res && res.length > 0) log('  invalid configuration', res);
-  log(`test ${title}/${human.tf.getBackend()}`, human.config);
+  log(`test ${title}/${human.tf.getBackend()}`);
   await human.load();
   const models = Object.keys(human.models).map((model) => ({ name: model, loaded: (human.models[model] !== null) }));
   log('  models', models);
@@ -93,6 +93,54 @@ async function testDefault(title, testConfig = {}) {
   return res;
 }
 
+async function testMatch() {
+  human.reset();
+  await human.warmup({ warmup: 'face' });
+  const img1 = await image('../../samples/in/ai-body.jpg');
+  const input1 = await human.image(img1);
+  const img2 = await image('../../samples/in/ai-face.jpg');
+  const input2 = await human.image(img2);
+  const res1 = await human.detect(input1.tensor);
+  const res2 = await human.detect(input2.tensor);
+  const desc1 = res1?.face?.[0]?.embedding;
+  const desc2 = res2?.face?.[0]?.embedding;
+  const similarity = await human.similarity(desc1, desc2);
+  const descArray = [];
+  for (let i = 0; i < 100; i++) descArray.push(desc2);
+  const match = await human.match(desc1, descArray);
+  log(`test similarity/${human.tf.getBackend()}`, match, similarity);
+}
+
+async function testWorker() {
+  log(`test webworker/${human.tf.getBackend()}`);
+  const img = await image('../../samples/in/ai-body.jpg');
+  const canvas = document.createElement('canvas');
+  canvas.width = img.naturalWidth;
+  canvas.height = img.naturalHeight;
+  const ctx = canvas.getContext('2d');
+  ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
+  const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
+  const worker = new Worker('test-browser-worker.js');
+  let res;
+  const userConfig = {
+    backend: human.tf.getBackend(),
+    debug: true,
+    face: { enabled: false },
+    hand: { enabled: false },
+    body: { enabled: true },
+    object: { enabled: false },
+  };
+  return new Promise((resolve) => {
+    worker.addEventListener('message', (msg) => {
+      res = msg.data.result;
+      log('  summary', { face: res.face.length, body: res.body.length, hand: res.hand.length, object: res.object.length, gesture: res.gesture.length });
+      resolve();
+    });
+    // pass image data as arraybuffer to worker by reference to avoid copy
+    worker.postMessage({ image: imageData.data.buffer, width: canvas.width, height: canvas.height, userConfig }, [imageData.data.buffer]);
+  });
+}
+
 async function runBenchmark() {
   const img = await image('../../samples/in/ai-face.jpg');
   human.reset();
@@ -142,12 +190,11 @@ async function main() {
     await testDefault('sync', { debug: true, async: false });
     await testDefault('none', { debug: true, async: true, face: { enabled: false }, body: { enabled: false }, hand: { enabled: false }, gesture: { enabled: false }, segmentation: { enabled: false }, object: { enabled: false } });
     await testDefault('object', { debug: true, async: true, face: { enabled: false }, body: { enabled: false }, hand: { enabled: false }, gesture: { enabled: false }, segmentation: { enabled: false }, object: { enabled: true } });
+    await testMatch();
+    await testWorker();
     // TBD detectors only
     // TBD segmentation
-    // TBD face match
     // TBD non-default models
-    // TBD web workers
-    // TBD multiple instances
   }
   log('tests complete');
   for (const backend of backends) {
diff --git a/test/test-browser-worker.js b/test/test-browser-worker.js
new file mode 100644
index 00000000..f77dad74
--- /dev/null
+++ b/test/test-browser-worker.js
@@ -0,0 +1,18 @@
+/// <reference lib="webworker"/>
+
+// load Human using IIFE script as Chome Mobile does not support Modules as Workers
+self.importScripts('../dist/human.js'); // eslint-disable-line no-restricted-globals
+
+// eslint-disable-next-line new-cap, no-undef
+const human = new Human.default();
+
+onmessage = async (msg) => { // receive message from main thread
+  console.log('worker onmessage', msg.data); // eslint-disable-line no-console
+  const image = new ImageData(new Uint8ClampedArray(msg.data.image), msg.data.width, msg.data.height);
+  const result = await human.detect(image, msg.data.userConfig);
+  result.tensors = human.tf.engine().state.numTensors; // append to result object so main thread get info
+  result.backend = human.tf.getBackend(); // append to result object so main thread get info
+  result.canvas = null; // must strip original canvas from return value as it cannot be transfered from worker thread
+  console.log('worker result', result); // eslint-disable-line no-console
+  postMessage({ result }); // send message back to main thread without canvas
+};