add regression test

Author: baileympearson

test/integration/read-write-concern/write_concern.test.ts

@@ -304,4 +304,50 @@ describe('Write Concern', function () {
       }
     });
   });
+
+  describe('NODE-6763: write concern is still added with timeoutMS is set', function () {
+    let client: MongoClient;
+    let collection: Collection;
+    const commands: CommandStartedEvent[] = [];
+    beforeEach(async function () {
+      client = this.configuration.newClient({}, { monitorCommands: true });
+      client.on('commandStarted', filterForCommands('insert', commands));
+      collection = client.db('foo').collection('bar');
+    })
+
+
+    afterEach(async function () {
+      await client.close();
+      commands.length = 0;
+    })
+
+    context('when the write concern includes only timeouts', function () {
+      it('the writeConcern is not added to the command.', async function () {
+        await collection.insertOne({ name: 'john doe' }, { timeoutMS: 1000, writeConcern: { wtimeout: 1000 } });
+        const [
+          {
+            command: {
+              writeConcern
+            }
+          }
+        ] = commands;
+        expect(writeConcern).not.to.exist;
+      })
+    })
+
+    context('when the write concern includes only non-timeout values (`w`)', function () {
+      it('the writeConcern is added to the command.', async function () {
+        await collection.insertOne({ name: 'john doe' }, { timeoutMS: 1000, writeConcern: { wtimeout: 1000, w: 'majority' } });
+        const [
+          {
+            command: {
+              writeConcern
+            }
+          }
+        ] = commands;
+        expect(writeConcern).to.deep.equal({ w: 'majority' })
+      })
+
+    })
+  })
 });

test/unit/utils.test.ts

@@ -403,7 +403,7 @@ describe('driver utils', function () {
       it('should be instanceof GeneratorFunction', () => {
         const list = new List<number>();
         // eslint-disable-next-line @typescript-eslint/no-empty-function
-        expect(list[Symbol.iterator]).to.be.instanceOf(function* () {}.constructor);
+        expect(list[Symbol.iterator]).to.be.instanceOf(function* () { }.constructor);
       });
 
       it('should only run generator for the number of items in the list', () => {
@@ -857,9 +857,8 @@ describe('driver utils', function () {
         continue;
       }
 
-      const title = `comparing ${oid1} to ${oid2} returns ${
-        result === 0 ? 'equal' : result === -1 ? 'less than' : 'greater than'
-      }`;
+      const title = `comparing ${oid1} to ${oid2} returns ${result === 0 ? 'equal' : result === -1 ? 'less than' : 'greater than'
+        }`;
       // @ts-expect-error: not narrowed based on numeric result, but these values are correct
       it(title, () => expect(compareObjectId(oid1, oid2)).to.equal(result));
     }