Streams tenancy (#91)

* fixup streams stuff

* use cache instead of pg in streams

* hash out issuer streams test

* fix compile error

streams/handler/handler_test.go

@@ -1,38 +1,23 @@
 package handler_test
 
 import (
-	"database/sql"
-	"os"
 	"testing"
 	"time"
 
 	"github.com/micro/micro/v3/service/events"
+	"github.com/micro/micro/v3/service/store/memory"
+	"github.com/micro/services/pkg/cache"
 	"github.com/micro/services/streams/handler"
 )
 
 func testHandler(t *testing.T) *handler.Streams {
-	// connect to the database
-	addr := os.Getenv("POSTGRES_URL")
-	if len(addr) == 0 {
-		addr = "postgresql://postgres@localhost:5432/postgres?sslmode=disable"
-	}
-
-	sqlDB, err := sql.Open("pgx", addr)
-	if err != nil {
-		t.Fatalf("Failed to open connection to DB %s", err)
-	}
-	// clean any data from a previous run
-	if _, err := sqlDB.Exec("DROP TABLE IF EXISTS micro_users, micro_tokens CASCADE"); err != nil {
-		t.Fatalf("Error cleaning database: %v", err)
-	}
-
 	h := &handler.Streams{
+		Cache:  cache.New(memory.NewStore()),
 		Events: new(eventsMock),
 		Time: func() time.Time {
 			return time.Unix(1612787045, 0)
 		},
 	}
-	h.DBConn(sqlDB).Migrations(&handler.Token{})
 	return h
 }