diff --git a/lib/utils/objects.js b/lib/utils/objects.js
index 6999ec06d..edc709edd 100644
--- a/lib/utils/objects.js
+++ b/lib/utils/objects.js
@@ -1,122 +1,119 @@
 // @flow
 
 import stableStringify from 'fast-json-stable-stringify';
 import invariant from 'invariant';
-import _difference from 'lodash/fp/difference.js';
 import _isEqual from 'lodash/fp/isEqual.js';
 import _isPlainObject from 'lodash/fp/isPlainObject.js';
 import stringHash from 'string-hash';
 
 type ObjectMap<K, T> = { +[key: K]: T };
 type NestedObjectMap<K, T> = { +[key: K]: T | NestedObjectMap<K, T> };
 
 function findMaximumDepth(obj: Object): ?{ path: string, depth: number } {
   let longestPath = null;
   let longestDepth = null;
   for (const key in obj) {
     const value = obj[key];
     if (typeof value !== 'object' || !value) {
       if (!longestDepth) {
         longestPath = key;
         longestDepth = 1;
       }
       continue;
     }
     const childResult = findMaximumDepth(obj[key]);
     if (!childResult) {
       continue;
     }
     const { path, depth } = childResult;
     const ourDepth = depth + 1;
     if (longestDepth === null || ourDepth > longestDepth) {
       longestPath = `${key}.${path}`;
       longestDepth = ourDepth;
     }
   }
   if (!longestPath || !longestDepth) {
     return null;
   }
   return { path: longestPath, depth: longestDepth };
 }
 
 function values<K, T>(map: ObjectMap<K, T>): T[] {
   return Object.values
     ? // https://github.com/facebook/flow/issues/2221
       // $FlowFixMe - Object.values currently does not have good flow support
       Object.values(map)
     : Object.keys(map).map((key: K): T => map[key]);
 }
 
 function keys<K, T>(map: ObjectMap<K, T>): K[] {
   return Object.keys(map);
 }
 
 function assignValueWithKey<K, T>(
   obj: NestedObjectMap<K, T>,
   key: K,
   value: T | NestedObjectMap<K, T>,
 ): NestedObjectMap<K, T> {
   return {
     ...obj,
     ...Object.fromEntries([[key, value]]),
   };
 }
 
 function hash(obj: ?Object): number {
   if (!obj) {
     return -1;
   }
   return stringHash(stableStringify(obj));
 }
 
 // returns an object with properties from obj1 not included in obj2
 function deepDiff<K, T>(
   obj1: NestedObjectMap<K, T>,
   obj2: NestedObjectMap<K, T>,
 ): NestedObjectMap<K, T> {
   let diff: NestedObjectMap<K, T> = {};
   keys(obj1).forEach((key: K) => {
     if (_isEqual(obj1[key], obj2[key])) {
       return;
     }
 
     if (!_isPlainObject(obj1[key]) || !_isPlainObject(obj2[key])) {
       diff = assignValueWithKey(diff, key, obj1[key]);
       return;
     }
 
     const nestedObj1: ObjectMap<K, T> = (obj1[key]: any);
     const nestedObj2: ObjectMap<K, T> = (obj2[key]: any);
 
     const nestedDiff = deepDiff(nestedObj1, nestedObj2);
     if (Object.keys(nestedDiff).length > 0) {
       diff = assignValueWithKey(diff, key, nestedDiff);
     }
   });
   return diff;
 }
 
 function assertObjectsAreEqual<K, T>(
   processedObject: ObjectMap<K, T>,
   expectedObject: ObjectMap<K, T>,
   message: string,
 ) {
-  const processedObjectKeys = Object.keys(processedObject);
-  const expectedObjectKeys = Object.keys(expectedObject);
-
-  const inProcessedButNotExpected =
-    _difference(processedObjectKeys)(expectedObjectKeys);
-  const inExpectedButNotProcessed =
-    _difference(expectedObjectKeys)(processedObjectKeys);
+  if (_isEqual(processedObject)(expectedObject)) {
+    return;
+  }
+  const dataProcessedButNotExpected = deepDiff(processedObject, expectedObject);
+  const dataExpectedButNotProcessed = deepDiff(expectedObject, processedObject);
 
   invariant(
-    _isEqual(processedObject)(expectedObject),
+    false,
     `${message}: Objects should be equal.` +
-      ` Object keys processed but not expected:` +
-      ` ${inExpectedButNotProcessed.toString()}` +
-      ` Object keys expected but not processed:` +
-      ` ${inProcessedButNotExpected.toString()}`,
+      ` Data processed but not expected:` +
+      ` ${JSON.stringify(dataProcessedButNotExpected)}` +
+      ` Data expected but not processed:` +
+      ` ${JSON.stringify(dataExpectedButNotProcessed)}`,
   );
 }
 
 export { findMaximumDepth, values, hash, assertObjectsAreEqual, deepDiff };