Fix failing spec

cats-effect/src/test/scala/io/kaizensolutions/virgil/CollectionsSpec.scala

@@ -7,10 +7,10 @@ import weaver._
 import weaver.scalacheck.CheckConfig
 import weaver.scalacheck.Checkers
 
-import scala.concurrent.duration._
-
 class CollectionsSpec(global: GlobalRead) extends IOSuite with ResourceSuite with Checkers {
 
+  override def maxParallelism: Int = 1
+
   override def checkConfig: CheckConfig =
     CheckConfig.default
       .copy(
@@ -24,15 +24,14 @@ class CollectionsSpec(global: GlobalRead) extends IOSuite with ResourceSuite wit
 
   override def sharedResource: Resource[IO, Res] = global.getOrFailR[Res]()
 
-  test("Read and write a row containing collections".ignore) { executor =>
+  test("Read and write a row containing collections") { executor =>
     import SimpleCollectionRow._
     forall(gen) { expected =>
       for {
         _         <- executor.executeMutation(insert(expected))
-        _         <- IO.sleep(1.second)
         actual    <- executor.execute(select(expected.id)).compile.toList
         resultAll <- executor.execute(selectAll).compile.toList
-      } yield expect.all(actual == expected, actual.length == 1, resultAll.contains(expected))
+      } yield expect.all(actual.length == 1, actual.head == expected, resultAll.contains(expected))
     }
   }