fix: Guard against jest.useRealTimers not existing

[ph-fritsche]

What:

Check if jest.useRealTimers is a function before calling it.
Closes #905

Why:

In some environments (e.g. codesandbox) jest exists but is either null or the useRealTimers and useFakeTimers don't exist.

Checklist:

• N/A Documentation added to the
  docs site
• N/A Tests
• N/A Typescript definitions updated
• Ready to be merged

[codesandbox-ci]

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Sandbox	Source
react-testing-library-examples	Configuration

[codecov]

Codecov Report

Merging #934 (80a6af8) into master (793d598) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #934   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines          948       953    +5     
  Branches       284       289    +5     
=========================================
+ Hits           948       953    +5     

Flag	Coverage Δ
node-10.14.2	100.00% <100.00%> (ø)
node-12	100.00% <100.00%> (ø)
node-14	100.00% <100.00%> (ø)
node-16	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/helpers.js	100.00% <100.00%> (ø)

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[eps1lon]

Looks good. Just one potential ReferenceError slipped through I think.

[eps1lon]

Verified this change actually fixes #905 with

diff --git a/package.json b/package.json
index 76ba73e..8ab24e3 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "license": "Apache License, Version 2.0",
   "type": "module",
   "dependencies": {
-    "@tmtsoftware/esw-ts": "git+https://github.com/tmtsoftware/esw-ts#2a03d094a7439b4f21bd262c10f13d9f2ef76033",
+    "@tmtsoftware/esw-ts": "https://github.com/eps1lon/esw-ts#fad5e14e22ab4e6019bf8a1012906044ec36aa7e",
     "antd": "^4.13.1",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
@@ -66,5 +66,8 @@
     "stylelint-config-standard": "^21.0.0",
     "ts-mockito": "^2.6.1",
     "typescript": "^4.2.3"
+  },
+  "resolutions": {
+    "**/@testing-library/dom": "https://pkg.csb.dev/testing-library/dom-testing-library/commit/80a6af82/@testing-library/dom"
   }
 }

[github-actions]

🎉 This PR is included in version 7.30.4 🎉

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