From 5f64df60276611739160d9bbbabaa2701b46e21d Mon Sep 17 00:00:00 2001
From: Alex Coles <alex@alexbcoles.com>
Date: Tue, 5 Sep 2017 12:29:08 +0100
Subject: [PATCH] Jest 21.0.0: Make message in matchers a function

Jest 21.0.0 and above expect `result.message` to be a function.

See Jest commit:
https://github.com/facebook/jest/commit/b3d944e79699fb9a4f399b163b5f0a64cdbf44c4
---
 src/toHaveStyleRule.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/toHaveStyleRule.js b/src/toHaveStyleRule.js
index 7f0bec0..e3962db 100644
--- a/src/toHaveStyleRule.js
+++ b/src/toHaveStyleRule.js
@@ -62,7 +62,7 @@ const getDeclarations = (rules, property) =>
 
 const die = (utils, property) => ({
   pass: false,
-  message: `Property not found: ${utils.printReceived(property)}`,
+  message: () => `Property not found: ${utils.printReceived(property)}`,
 })
 
 function toHaveStyleRule(received, property, value, options = {}) {
@@ -87,7 +87,7 @@ function toHaveStyleRule(received, property, value, options = {}) {
       ? value.test(declaration.value)
       : value === declaration.value
 
-  const message =
+  const message = () =>
     `Expected ${property}${pass ? ' not ' : ' '}to match:\n` +
     `  ${this.utils.printExpected(value)}\n` +
     'Received:\n' +