VDiff2: Migrate VDiff1 Unit Tests (#11916)

* Initial workflow differ tests

Signed-off-by: Matt Lord <mattalord@gmail.com>

* More tests

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Playing with vdiffEnv

Signed-off-by: Matt Lord <mattalord@gmail.com>

* more vdiffEnv work

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Use a shard testenv as it creates a vttestserver and mysqld instanc3

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Add vtctl client results/report tests

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Add TestVDiff to test full set of queries

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Finish up vtctl report building unit tests

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Deflake the unit tests in the CI

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Add TestVDiff2Sharded

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Minor changes after self review

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Reduce resource usage for race condition unit tests

We were creating a somewhat crazy number of resources.

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Fix data race in TestVDiff

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Correct Wrangler semaphore usage

Signed-off-by: Matt Lord <mattalord@gmail.com>

* Minor change after another self review

Signed-off-by: Matt Lord <mattalord@gmail.com>

Signed-off-by: Matt Lord <mattalord@gmail.com>

go/vt/vtctl/grpcvtctldserver/server.go

@@ -97,6 +97,16 @@ func NewVtctldServer(ts *topo.Server) *VtctldServer {
  }
 }
 
+// NewTestVtctldServer returns a new VtctldServer for the given topo server
+// AND tmclient for use in tests. This should NOT be used in production.
+func NewTestVtctldServer(ts *topo.Server, tmc tmclient.TabletManagerClient) *VtctldServer {
+ return &VtctldServer{
+ ts: ts,
+ tmc: tmc,
+ ws: workflow.NewServer(ts, tmc),
+ }
+}
+
 func panicHandler(err *error) {
  if x := recover(); x != nil {
  *err = fmt.Errorf("uncaught panic: %v", x)