Use nock to mock JWKS

Author: jbarnsley10

jest.config.cjs

@@ -25,6 +25,7 @@ module.exports = {
   modulePathIgnorePatterns: ['<rootDir>/coverage/', '<rootDir>/.server/'],
   coverageDirectory: '<rootDir>/coverage',
   setupFiles: ['<rootDir>/jest.setup.js'],
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.after-env.js'],
   transform: {
     '^.+\\.(cjs|js|mjs)$': [
       'babel-jest',

jest.setup.after-env.js

@@ -0,0 +1,28 @@
+import nock from 'nock'
+
+const jwksUri = process.env.OIDC_JWKS_URI
+const okStatusCode = 200
+
+const testJwks = {
+  keys: [
+    {
+      kty: 'RSA',
+      use: 'sig',
+      kid: 'test-jwks-key',
+      alg: 'RS256',
+      n: 'test-key-modulus',
+      e: 'AQAB'
+    }
+  ]
+}
+
+if (jwksUri) {
+  const { origin, pathname, search } = new URL(jwksUri)
+
+  nock.cleanAll()
+
+  nock(origin)
+    .persist()
+    .get(`${pathname}${search}`)
+    .reply(okStatusCode, testJwks)
+}

package-lock.json

@@ -86,6 +86,7 @@
     "jest": "29.7.0",
     "lint-staged": "^16.1.2",
     "luxon": "^3.6.1",
+    "nock": "14.0.11",
     "nunjucks": "3.2.4",
     "oidc-client-ts": "^3.2.1",
     "prettier": "^3.5.3",