Begin adding syncapi component tests (#2442)

* Add very basic syncapi tests

* Add a way to inject jetstream messages

* implement add_state_ids

* bugfixes

* Unbreak tests

* Remove now un-needed API call

* Linting

setup/base/base.go

@@ -86,6 +86,7 @@ type BaseDendrite struct {
 	DNSCache               *gomatrixserverlib.DNSCache
 	Database               *sql.DB
 	DatabaseWriter         sqlutil.Writer
+	EnableMetrics          bool
 }
 
 const NoListener = ""
@@ -96,7 +97,7 @@ const HTTPClientTimeout = time.Second * 30
 type BaseDendriteOptions int
 
 const (
-	NoCacheMetrics BaseDendriteOptions = iota
+	DisableMetrics BaseDendriteOptions = iota
 	UseHTTPAPIs
 	PolylithMode
 )
@@ -107,12 +108,12 @@ const (
 func NewBaseDendrite(cfg *config.Dendrite, componentName string, options ...BaseDendriteOptions) *BaseDendrite {
 	platformSanityChecks()
 	useHTTPAPIs := false
-	cacheMetrics := true
+	enableMetrics := true
 	isMonolith := true
 	for _, opt := range options {
 		switch opt {
-		case NoCacheMetrics:
-			cacheMetrics = false
+		case DisableMetrics:
+			enableMetrics = false
 		case UseHTTPAPIs:
 			useHTTPAPIs = true
 		case PolylithMode:
@@ -160,7 +161,7 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string, options ...Base
 		}
 	}
 
-	cache, err := caching.NewInMemoryLRUCache(cacheMetrics)
+	cache, err := caching.NewInMemoryLRUCache(enableMetrics)
 	if err != nil {
 		logrus.WithError(err).Warnf("Failed to create cache")
 	}
@@ -246,6 +247,7 @@ func NewBaseDendrite(cfg *config.Dendrite, componentName string, options ...Base
 		apiHttpClient:          &apiClient,
 		Database:               db,     // set if monolith with global connection pool only
 		DatabaseWriter:         writer, // set if monolith with global connection pool only
+		EnableMetrics:          enableMetrics,
 	}
 }
 

setup/jetstream/nats.go

@@ -13,6 +13,7 @@ import (
 	"github.com/sirupsen/logrus"
 
 	natsserver "github.com/nats-io/nats-server/v2/server"
+	"github.com/nats-io/nats.go"
 	natsclient "github.com/nats-io/nats.go"
 )
 
@@ -21,6 +22,13 @@ type NATSInstance struct {
 	sync.Mutex
 }
 
+func DeleteAllStreams(js nats.JetStreamContext, cfg *config.JetStream) {
+	for _, stream := range streams { // streams are defined in streams.go
+		name := cfg.Prefixed(stream.Name)
+		_ = js.DeleteStream(name)
+	}
+}
+
 func (s *NATSInstance) Prepare(process *process.ProcessContext, cfg *config.JetStream) (natsclient.JetStreamContext, *natsclient.Conn) {
 	// check if we need an in-process NATS Server
 	if len(cfg.Addresses) != 0 {