add another test

plugins/node/opentelemetry-instrumentation-mongodb/test/mongodb.test.ts

@@ -250,6 +250,37 @@ describe('MongoDBInstrumentation', () => {
     });
   });
 
+  describe('when using enhanced database reporting without db statementSerializer', () => {
+    const key = 'key';
+    const value = 'value';
+    const object = { [key]: value };
+
+    beforeEach(() => {
+      memoryExporter.reset();
+      create({
+        enhancedDatabaseReporting: false,
+      });
+    });
+
+    it('should properly collect db statement (hide attribute values)', done => {
+      const span = provider.getTracer('default').startSpan('insertRootSpan');
+        context.with(trace.setSpan(context.active(), span), () => {
+          collection.insertOne(object).then(() => {
+            span.end();
+            const spans = memoryExporter.getFinishedSpans();
+            const operationName = 'mongodb.insert';
+            assertSpans(spans, operationName, SpanKind.CLIENT, false, false);
+            const mongoSpan = spans.find(s => s.name === operationName);
+            const dbStatement = JSON.parse(
+              mongoSpan!.attributes[SemanticAttributes.DB_STATEMENT] as string
+            );
+            assert.strictEqual(dbStatement[key], '?');
+            done();
+          });
+        });
+    });
+  });
+
   describe('when specifying a dbStatementSerializer configuration', () => {
     const key = 'key';
     const value = 'value';