fixed test runner fatal error reporting

test/index.js

@@ -1,4 +1,14 @@
 function requireAll(req) {
-    req.keys().forEach(req);
+    req.keys().forEach((mod) => {
+        try {
+            req(mod);
+        } catch (ex) {
+            // eslint-disable-next-line no-console
+            console.error('Error while running test', mod, ex.toString());
+            if ('testErrors' in global) {
+                global.testErrors++;
+            }
+        }
+    });
 }
 requireAll(require.context('test/src/', true, /\.js$/));

test/runner.html

@@ -23,11 +23,15 @@
         <script class="mocha-init">
             mocha.setup('bdd');
             mocha.checkLeaks();
+            window.testErrors = 0;
         </script>
         <script src="dist/test.bundle.js"></script>
         <script class="mocha-exec">
             mocha.reporter('spec');
-            mocha.run(failures => (window.done = { failures }));
+            mocha.run((failures) => {
+                failures += window.testErrors;
+                window.done = { failures };
+            });
         </script>
     </body>
 </html>