TML-2840: match extractDb error message to its condition

The guard is `!isMongoControlDriver(driver)` — a tag check — but the
old message said "does not expose a db property", describing the
property-presence check it replaced.  Updated the message and the
matching test assertion to reflect what the predicate actually checks.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: Will Madden <madden@prisma.io>

Author: wmadden

packages/3-mongo-target/2-mongo-adapter/src/core/runner-deps.ts

@@ -19,8 +19,8 @@ import { isMongoControlDriver } from './mongo-control-driver';
 export function extractDb(driver: ControlDriverInstance<'mongo', 'mongo'>): Db {
   if (!isMongoControlDriver(driver)) {
     throw new Error(
-      'Mongo control driver does not expose a db property. ' +
-        'Use mongoControlDriver.create() from `@prisma-next/driver-mongo/control`.',
+      'Expected a Mongo control driver created by ' +
+        'mongoControlDriver.create() from `@prisma-next/driver-mongo/control`.',
     );
   }
   return driver.db;

packages/3-mongo-target/2-mongo-adapter/test/runner-deps.test.ts

@@ -17,10 +17,8 @@ describe('extractDb', () => {
     expect(extractDb(driver)).toBe(fakeDb);
   });
 
-  it("throws when the mongo control driver doesn't expose a db property", () => {
+  it('throws when the value is not a Mongo control driver', () => {
     const driver = {} as unknown as ControlDriverInstance<'mongo', 'mongo'>;
-    expect(() => extractDb(driver)).toThrowError(
-      /Mongo control driver does not expose a db property/,
-    );
+    expect(() => extractDb(driver)).toThrowError(/Expected a Mongo control driver/);
   });
 });