kvdb/postgres: fix tests

kvdb/postgres/fixture.go

@@ -26,10 +26,14 @@ func getTestDsn(dbName string) string {
 
 var testPostgres *embeddedpostgres.EmbeddedPostgres
 
+const testMaxConnections = 50
+
 // StartEmbeddedPostgres starts an embedded postgres instance. This only needs
 // to be done once, because NewFixture will create random new databases on every
 // call. It returns a stop closure that stops the database if called.
 func StartEmbeddedPostgres() (func() error, error) {
+	Init(testMaxConnections)
+
 	postgres := embeddedpostgres.NewDatabase(
 		embeddedpostgres.DefaultConfig().
 			Port(9876))