1 files changed, 48 insertions, 0 deletions
diff --git a/spec/frontend/jira_connect/subscriptions/pkce_spec.js b/spec/frontend/jira_connect/subscriptions/pkce_spec.js
new file mode 100644
index 00000000000..4ee88059b7a
--- /dev/null
+++ b/spec/frontend/jira_connect/subscriptions/pkce_spec.js
@@ -0,0 +1,48 @@
+import crypto from 'crypto';
+import { TextEncoder, TextDecoder } from 'util';
+
+import { createCodeVerifier, createCodeChallenge } from '~/jira_connect/subscriptions/pkce';
+
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder;
+
+describe('pkce', () => {
+  beforeAll(() => {
+    Object.defineProperty(global.self, 'crypto', {
+      value: {
+        getRandomValues: (arr) => crypto.randomBytes(arr.length),
+        subtle: {
+          digest: jest.fn().mockResolvedValue(new ArrayBuffer(1)),
+        },
+      },
+    });
+  });
+
+  describe('createCodeVerifier', () => {
+    it('calls `window.crypto.getRandomValues`', () => {
+      window.crypto.getRandomValues = jest.fn();
+      createCodeVerifier();
+
+      expect(window.crypto.getRandomValues).toHaveBeenCalled();
+    });
+
+    it(`returns a string with 128 characters`, () => {
+      const codeVerifier = createCodeVerifier();
+      expect(codeVerifier).toHaveLength(128);
+    });
+  });
+
+  describe('createCodeChallenge', () => {
+    it('calls `window.crypto.subtle.digest` with correct arguments', async () => {
+      await createCodeChallenge('1234');
+
+      expect(window.crypto.subtle.digest).toHaveBeenCalledWith('SHA-256', expect.anything());
+    });
+
+    it('returns base64 URL-encoded string', async () => {
+      const codeChallenge = await createCodeChallenge('1234');
+
+      expect(codeChallenge).toBe('AA');
+    });
+  });
+});