update tests

Author: liabru

test/ExampleWorker.js

@@ -185,6 +185,7 @@ const prepareEnvironment = options => {
       height: 600,
       style: {},
       addEventListener: () => {},
+      setAttribute: () => {},
       getAttribute: name => ({
         'data-pixel-ratio': '1'
       }[name]),

test/TestTools.js

@@ -238,7 +238,7 @@ const extrinsicSimilarity = (currentCaptures, referenceCaptures, key='extrinsic'
             }
         }
 
-        result[name] = 1 - (totalSimilarity / totalCount);
+        result[name] = 1 - (totalSimilarity / (totalCount || 1));
     }
 
     return result;