Fix for jest handling of static assets when running tests. See:

jestjs/jest#2663 (comment)

package.json

@@ -112,10 +112,10 @@
     "url": "https://github.com/coryhouse/react-slingshot"
   },
   "jest": {
-    "moduleNameMapper": {
-      "\\.(css|scss)$": "identity-obj-proxy",
-      "^.+\\.(gif|ttf|eot|svg|woff|woff2|ico)$": "<rootDir>/tools/fileMock.js"
-    }
+    "moduleNameMapper": { 
+    "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/tools/assetsTransformer.js", 
+    "\\.(css|less)$": "<rootDir>/tools/assetsTransformer.js" 
+    }  
   },
   "babel": {
     "presets": [

tools/assetsTransformer.js

@@ -0,0 +1,14 @@
+//---------------------------------------------------------------------
+// This is a fix for jest handling static assets like imported images
+// when running tests. It's configured in jest section of package.json 
+//
+// See:
+// https://github.com/facebook/jest/issues/2663#issuecomment-317109798
+//---------------------------------------------------------------------
+const path = require('path');
+
+module.exports = {
+  process(src, filename /*, config, options */) {
+    return 'module.exports = ' + JSON.stringify(path.basename(filename)) + ';';
+  },
+};