feat: Deprecation DEPPS5: Config option allowClientClassCreation defaults to false (#8849)

BREAKING CHANGE: The Parse Server option `allowClientClassCreation` defaults to `false`.

spec/ParseUser.spec.js

@@ -4402,3 +4402,31 @@ describe('login as other user', () => {
     done();
   });
 });
+
+describe('allowClientClassCreation option', () => {
+  it('should enforce boolean values', async () => {
+    const options = [[], 'a', '', 0, 1, {}, 'true', 'false'];
+    for (const option of options) {
+      await expectAsync(reconfigureServer({ allowClientClassCreation: option })).toBeRejected();
+    }
+  });
+
+  it('should accept true value', async () => {
+    await reconfigureServer({ allowClientClassCreation: true });
+    expect(Config.get(Parse.applicationId).allowClientClassCreation).toBe(true);
+  });
+
+  it('should accept false value', async () => {
+    await reconfigureServer({ allowClientClassCreation: false });
+    expect(Config.get(Parse.applicationId).allowClientClassCreation).toBe(false);
+  });
+
+  it('should default false', async () => {
+    // remove predefined allowClientClassCreation:true on global defaultConfiguration
+    delete defaultConfiguration.allowClientClassCreation;
+    await reconfigureServer(defaultConfiguration);
+    expect(Config.get(Parse.applicationId).allowClientClassCreation).toBe(false);
+    // Need to set it back to true to avoid other test fails
+    defaultConfiguration.allowClientClassCreation = true;
+  });
+});