test(NODE-6323): add performance no-op baseline test (#4194)

test/benchmarks/mongoBench/suites/singleBench.js

@@ -13,8 +13,30 @@ const {
 
 function makeSingleBench(suite) {
   suite
+    .benchmark('returnDocument', benchmark =>
+      benchmark
+        .taskSize(1.531e-3) // One tweet is 1,531 bytes or 0.001531 MB
+        .setup(makeLoadJSON('tweet.json'))
+        .task(async function () {
+          return this.doc;
+        })
+    )
+    .benchmark('ping', benchmark =>
+      benchmark
+        .taskSize(0.15) // { ping: 1 } is 15 bytes of BSON x 10,000 iterations
+        .setup(makeClient)
+        .setup(connectClient)
+        .setup(initDb)
+        .task(async function () {
+          for (let i = 0; i < 10000; ++i) {
+            await this.db.command({ ping: 1 });
+          }
+        })
+        .teardown(disconnectClient)
+    )
     .benchmark('runCommand', benchmark =>
       benchmark
+        // { hello: true } is 13 bytes. However the legacy hello was 16 bytes, to preserve history comparison data we leave this value as is.
         .taskSize(0.16)
         .setup(makeClient)
         .setup(connectClient)