From 5e9376c6980b9867a6875937ac32534bd17a98f8 Mon Sep 17 00:00:00 2001
From: Matthew Dean <matthew.dean@digicatapult.org.uk>
Date: Thu, 11 Jan 2024 09:46:09 +0000
Subject: [PATCH] polyfil for TextDecoder in jsdom as according to
 https://github.com/jsdom/jsdom/issues/2524\#issuecomment-1118254830

---
 jest-setup.ts    | 12 ++++++++++++
 jest.config.json |  4 ++++
 package.json     |  4 ++--
 3 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 jest-setup.ts

diff --git a/jest-setup.ts b/jest-setup.ts
new file mode 100644
index 0000000..638cd6b
--- /dev/null
+++ b/jest-setup.ts
@@ -0,0 +1,12 @@
+import * as util from 'util'
+
+// ref: https://jestjs.io/docs/manual-mocks#mocking-methods-which-are-not-implemented-in-jsdom
+// ref: https://github.com/jsdom/jsdom/issues/2524
+Object.defineProperty(window, 'TextEncoder', {
+  writable: true,
+  value: util.TextEncoder
+})
+Object.defineProperty(window, 'TextDecoder', {
+  writable: true,
+  value: util.TextDecoder
+})
diff --git a/jest.config.json b/jest.config.json
index e7b7eb1..178ebba 100644
--- a/jest.config.json
+++ b/jest.config.json
@@ -20,6 +20,10 @@
   "testPathIgnorePatterns": [
     "<rootDir>/lib/"
   ],
+  "setupFiles": [
+    "dotenv/config",
+    "./jest-setup.ts"
+  ],
   "testEnvironment": "jsdom",
   "moduleNameMapper": {
     "^(\\.{1,2}/.*\\.util)\\.js$": "$1.mock",
diff --git a/package.json b/package.json
index 89c8bf5..e521047 100755
--- a/package.json
+++ b/package.json
@@ -21,11 +21,11 @@
     "clean": "rm -rf ./lib",
     "build": "npm run clean && tsc",
     "build:watch": "npm run clean && tsc --watch",
-    "coverage": "jest --coverage --setupFiles dotenv/config",
+    "coverage": "jest --coverage",
     "depcheck": "depcheck",
     "lint": "eslint .",
     "storybook": "storybook dev -p 9000",
-    "test": "jest --setupFiles dotenv/config"
+    "test": "jest"
   },
   "peerDependencies": {
     "react": "^18.2.0"