test: update custom instance test for cross-bundle compatibility

Not-Sarthak · Not-Sarthak · commit d840457505bc · 2026-03-09T15:30:35.000+05:30
Custom ObjectEnumValue instances are now accepted because we use a
global symbol for detection instead of singleton equality checks.
This is necessary for cross-bundle support — a singleton from a
different bundle is indistinguishable from a custom instance.
diff --git a/packages/client/tests/functional/json-null-types/tests.ts b/packages/client/tests/functional/json-null-types/tests.ts
@@ -72,15 +72,14 @@ testMatrix.setupTestSuite(
         expect(Prisma.AnyNull).toBeInstanceOf(Prisma.NullTypes.AnyNull)
       })
 
-      test('custom instances are not allowed', async () => {
-        await expect(
-          prisma.requiredJsonField.create({
-            data: {
-              // @ts-expect-error
-              json: new Prisma.NullTypes.JsonNull(),
-            },
-          }),
-        ).rejects.toMatchPrismaErrorInlineSnapshot(`"Invalid ObjectEnumValue"`)
+      test('custom instances are accepted for cross-bundle compatibility', async () => {
+        const record = await prisma.requiredJsonField.create({
+          data: {
+            // @ts-expect-error
+            json: new Prisma.NullTypes.JsonNull(),
+          },
+        })
+        expect(record.json).toBeNull()
       })
     })
   },
