From d5f18db3c3fca51e5908b683a0ce279c3c4e3893 Mon Sep 17 00:00:00 2001
From: Neil Gentleman <ngentleman@gmail.com>
Date: Tue, 15 Aug 2017 13:06:22 -0700
Subject: [PATCH] Jest 21 expects result.message to always be a function

ref: https://github.com/facebook/jest/issues/3921
ref: https://github.com/facebook/jest/pull/3972
---
 packages/jest-enzyme/src/index.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/jest-enzyme/src/index.js b/packages/jest-enzyme/src/index.js
index 9f228e4..deb5b5f 100644
--- a/packages/jest-enzyme/src/index.js
+++ b/packages/jest-enzyme/src/index.js
@@ -25,22 +25,22 @@ beforeEach(() => {
       [matcherKey](wrapper, ...args) {
         const result = enzymeMatchers[matcherKey].call(this, wrapper, ...args);
 
-        if (this.isNot) {
-          result.message = result.negatedMessage;
-        }
+        let message = this.isNot ? result.negatedMessage : result.message;
 
         if (result.contextualInformation.expected) {
-          result.message += `\n${this.utils.RECEIVED_COLOR(
+          message += `\n${this.utils.RECEIVED_COLOR(
             result.contextualInformation.expected
           )}`;
         }
 
         if (result.contextualInformation.actual) {
-          result.message += `\n${this.utils.EXPECTED_COLOR(
+          message += `\n${this.utils.EXPECTED_COLOR(
             result.contextualInformation.actual
           )}`;
         }
 
+        result.message = () => message;
+
         return result;
       },
     }[matcherKey];