diff --git a/.gitignore b/.gitignore
index 95fb987d3..8563e66cd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,8 @@ pages/**/*.js.map
 pogen/**/*.js.map
 test/**/*.js.map
 content_scripts/**/*.js.map
+testlib/**/*.js.map
+testlib/talertest.js
 background/*.js
 pogen/*.js
 test/*.js
@@ -20,4 +22,8 @@ build/
 taler-wallet-*.tar.gz
 taler-wallet-*.directive
 taler-wallet-*.directive.asc
-taler-wallet-*.sig
\ No newline at end of file
+taler-wallet-*.sig
+
+# Even though node_modules are tracked in git,
+# per default we don't want them to show up in git status
+node_modules
diff --git a/lib/emscripten/taler-emscripten-lib.d.ts b/lib/emscripten/taler-emscripten-lib.d.ts
index 0b180781a..97821d9ef 100644
--- a/lib/emscripten/taler-emscripten-lib.d.ts
+++ b/lib/emscripten/taler-emscripten-lib.d.ts
@@ -51,4 +51,6 @@ export declare namespace Module {
   function writeStringToMemory(s: string,
                                buffer: number,
                                dontAddNull?: boolean): void;
-}
\ No newline at end of file
+}
+
+export default Module;
diff --git a/lib/wallet/cryptoApi-test.ts b/lib/wallet/cryptoApi-test.ts
new file mode 100644
index 000000000..6399367b1
--- /dev/null
+++ b/lib/wallet/cryptoApi-test.ts
@@ -0,0 +1,6 @@
+import {CryptoApi} from "./cryptoApi";
+import {test, TestLib} from "testlib/talertest";
+
+test("string hashing", (t: TestLib) => {
+
+});
diff --git a/lib/wallet/cryptoWorker.ts b/lib/wallet/cryptoWorker.ts
index 22feb8eb7..0689c910e 100644
--- a/lib/wallet/cryptoWorker.ts
+++ b/lib/wallet/cryptoWorker.ts
@@ -45,7 +45,7 @@ if ("object" !== typeof Module) {
 // we can use it from TypeScript by importing it.
 
 {
-  let mod = System.newModule({Module: Module});
+  let mod = System.newModule({Module: Module, default: Module});
   let modName = System.normalizeSync("../emscripten/taler-emscripten-lib");
   console.log("registering", modName);
   System.set(modName, mod);
@@ -58,4 +58,4 @@ System.import("./cryptoLib")
       .catch((e) => {
         console.log("crypto worker failed");
         console.error(e.stack);
-      });
\ No newline at end of file
+      });
diff --git a/lib/wallet/emscriptif-test.ts b/lib/wallet/emscriptif-test.ts
new file mode 100644
index 000000000..a3a9229bb
--- /dev/null
+++ b/lib/wallet/emscriptif-test.ts
@@ -0,0 +1,11 @@
+import {test, TestLib} from "testlib/talertest";
+import * as native from "./emscriptif";
+
+test("string hashing", (t: TestLib) => {
+  let x = native.ByteArray.fromStringWithNull("hello taler");
+  let h = "8RDMADB3YNF3QZBS3V467YZVJAMC2QAQX0TZGVZ6Q5PFRRAJFT70HHN0QF661QR9QWKYMMC7YEMPD679D2RADXCYK8Y669A2A5MKQFR"
+  let hc = x.hash().toCrock();
+  console.log(`# hc ${hc}`);
+  t.assert(h === hc, "must equal");
+  t.pass();
+});
diff --git a/lib/wallet/emscriptif.ts b/lib/wallet/emscriptif.ts
index aad5a12a2..3ae2db72a 100644
--- a/lib/wallet/emscriptif.ts
+++ b/lib/wallet/emscriptif.ts
@@ -15,7 +15,7 @@
  */
 
 import {AmountJson} from "./types";
-import * as EmscWrapper from "../emscripten/taler-emscripten-lib";
+import Module, {EmscFunGen} from "../emscripten/taler-emscripten-lib";
 
 /**
  * High-level interface to emscripten-compiled modules used
@@ -34,14 +34,12 @@ const GNUNET_YES = 1;
 const GNUNET_NO = 0;
 const GNUNET_SYSERR = -1;
 
-let Module = EmscWrapper.Module;
-
 
 function myCcall(name: string, ret: any, argTypes: any[], args: any[]) {
   return Module.ccall(name, ret, argTypes, args);
 }
 
-let getEmsc: EmscWrapper.EmscFunGen = (name: string, ret: any,
+let getEmsc: EmscFunGen = (name: string, ret: any,
                                        argTypes: any[]) => {
   return (...args: any[]) => {
     return myCcall(name, ret, argTypes, args);
diff --git a/package.json b/package.json
index 406a15858..cd08e3196 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "map-stream": "0.0.6",
     "mocha": "^2.4.5",
     "po2json": "git+https://github.com/mikeedwards/po2json",
+    "selenium-webdriver": "^3.0.0-beta-3",
     "systemjs": "^0.19.14",
     "through2": "^2.0.1",
     "typescript": "^2.0.3",
diff --git a/scripts/prove-node b/scripts/prove-node
index de9c8931a..ca8405324 100755
--- a/scripts/prove-node
+++ b/scripts/prove-node
@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-exec prove -e "node ./testlib/testruntime.js" "$@"
+exec prove -e "node ./testlib/node/runtime.js" "$@"
diff --git a/scripts/prove-selenium b/scripts/prove-selenium
new file mode 100755
index 000000000..d2bd957a5
--- /dev/null
+++ b/scripts/prove-selenium
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+exec prove -e "node ./testlib/selenium/runtime.js" "$@"
diff --git a/testlib/testruntime.js b/testlib/node/runtime.js
similarity index 85%
rename from testlib/testruntime.js
rename to testlib/node/runtime.js
index 236807265..29ee508cc 100644
--- a/testlib/testruntime.js
+++ b/testlib/node/runtime.js
@@ -26,7 +26,7 @@ let vm = require("vm");
 let fs = require("fs");
 let process = require("process");
 
-let emsc = require("../lib/emscripten/taler-emscripten-lib.js");
+let emsc = require("../../lib/emscripten/taler-emscripten-lib.js");
 
 // Do it here, since it breaks 'require'' for libwrapper
 let System = require("systemjs");
@@ -49,13 +49,13 @@ System.config({
 
 console.log("TAP version 13");
 
-let mod = System.newModule({Module: emsc});
-let modName = System.normalizeSync(__dirname + "/../lib/emscripten/taler-emscripten-lib.js");
+let mod = System.newModule({Module: emsc, default: emsc});
+let modName = System.normalizeSync(__dirname + "/../../lib/emscripten/taler-emscripten-lib.js");
 System.set(modName, mod);
 
 
 let testName = process.argv[2];
-System.import("./testlib/talertest")
+System.import("testlib/talertest")
   .then(tt => {
     SystemJS.import(testName)
       .then(() => {
diff --git a/testlib/selenium/runtime.js b/testlib/selenium/runtime.js
new file mode 100644
index 000000000..0cf6c6d18
--- /dev/null
+++ b/testlib/selenium/runtime.js
@@ -0,0 +1,100 @@
+/*
+ This file is part of TALER
+ (C) 2016 Inria
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ *
+ * @author Florian Dold
+ */
+
+"use strict";
+
+var webdriver = require('selenium-webdriver');
+var chrome = require('selenium-webdriver/chrome');
+var path = require("path");
+var process = require("process");
+
+var p = "file://" + __dirname + "/testhost.html";
+
+if (!process.argv[2]) {
+  console.log("no test script given");
+  process.exit(1);
+}
+
+var testScript = path.resolve(process.argv[2]);
+
+var script = `
+  function f() {
+    System.import("testlib/talertest")
+      .then(tt => {
+        SystemJS.import("file://${testScript}")
+          .then(() => {
+            return tt.run();
+          })
+          .then(() => {
+            window.__test_over = true;
+          })
+          .catch((e) => {
+            window.__test_over = true;
+            console.error(e)
+          });
+      })
+      .catch((e) => {
+        console.error("can't locate talertest");
+        console.error(e);
+      });
+  }
+  if (document.readyState == "complete") {
+    f();
+  } else {
+    document.addEventListener("DOMContentLoaded", f);
+  }
+`;
+
+function untilTestOver() {
+  return driver.executeScript("return window.__test_over");
+}
+
+console.log("TAP version 13");
+
+var driver = new webdriver.Builder()
+  .setLoggingPrefs({browser: 'ALL'})
+  .forBrowser('chrome')
+  .build();
+
+driver.get(p);
+driver.executeScript(script);
+driver.wait(untilTestOver);
+
+driver.manage().logs().get("browser").then((logs) => {
+  for (let l of logs) {
+    if (l.level.name != "INFO") {
+      continue;
+    }
+    if (l.message.startsWith("{")) {
+      // format not understood, sometimes messages are logged
+      // with more structure, just pass it on
+      console.log(l.message);
+      continue;
+    }
+    let s1 = l.message.indexOf(" ") + 1;
+    let s2 = l.message.indexOf(" ", s1) + 1;
+    // Skip file url and LINE:COL
+    console.log(l.message.substring(s2));
+  }
+});
+
+driver.quit();
+
diff --git a/testlib/selenium/testhost.html b/testlib/selenium/testhost.html
new file mode 100644
index 000000000..263fe6316
--- /dev/null
+++ b/testlib/selenium/testhost.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<html>
+  <head>
+    <title>Browser Test Host</title>
+    <script src="../../lib/vendor/system-csp-production.src.js"></script>
+    <script>
+    System.config({
+        baseURL: "../../",
+        defaultJSExtensions: true,
+        meta: {
+          "lib/emscripten/taler-emscripten-lib": {
+            format: "global",
+            exports: "Module",
+          }
+        },
+    });
+    </script>
+  </head>
+</html>
diff --git a/testlib/talertest.ts b/testlib/talertest.ts
index 5dcaff457..14074620b 100644
--- a/testlib/talertest.ts
+++ b/testlib/talertest.ts
@@ -82,6 +82,7 @@ export async function run() {
       await p;
       console.log(`ok ${Number(i) + 1} ${lastMsg}`);
     } catch (e) {
+      console.error(e);
       console.log(`not ok ${Number(i) + 1} ${lastMsg}`);
     }
   }