[statemachine] simplify test states

tests/codex/utils/testasyncstatemachine.nim

@@ -10,52 +10,46 @@ type
   State2 = ref object of TestState
   State3 = ref object of TestState
 
-var state1Invoked = 0
-var state2Invoked = 0
-var state2Cancelled = 0
-var state3Invoked = 0
+var runs, cancellations = [0, 0, 0]
 
 method onMoveToNextStateEvent*(state: TestState): ?AsyncState {.base.} =
   discard
 
 method run(state: State1): Future[?AsyncState] {.async.} =
-  inc state1Invoked
+  inc runs[0]
   return some AsyncState(State2.new())
 
 method run(state: State2): Future[?AsyncState] {.async.} =
-  inc state2Invoked
+  inc runs[1]
   try:
     await sleepAsync(1.hours)
   except CancelledError:
-    inc state2Cancelled
-
+    inc cancellations[1]
 
 method onMoveToNextStateEvent(state: State2): ?AsyncState =
   return some AsyncState(State3.new())
 
 method run(state: State3): Future[?AsyncState] {.async.} =
-  inc state3Invoked
+  inc runs[2]
 
 suite "async state machines":
   var machine: AsyncStateMachine
   var state1, state2: AsyncState
 
   setup:
-    state1Invoked = 0
-    state2Invoked = 0
-    state2Cancelled = 0
-    state3Invoked = 0
+    runs = [0, 0, 0]
+    cancellations = [0, 0, 0]
     machine = AsyncStateMachine.new()
     state1 = State1.new()
     state2 = State2.new()
 
   test "should call run on start state":
     machine.start(state1)
-    check eventually state1Invoked == 1
+    check eventually runs[0] == 1
 
   test "moves to next state when run completes":
     machine.start(state1)
-    check eventually state2Invoked == 1
+    check eventually runs == [1, 1, 0]
 
   test "state2 moves to state3 on event":
     machine.start(state2)
@@ -65,7 +59,7 @@ suite "async state machines":
 
     machine.schedule(Event(moveToNextStateEvent))
 
-    check eventually state3Invoked == 1
+    check eventually runs == [0, 1, 1]
 
   test "state transition will cancel the running state":
     machine.start(state2)
@@ -75,4 +69,4 @@ suite "async state machines":
 
     machine.schedule(Event(moveToNextStateEvent))
 
-    check eventually state2Cancelled == 1
+    check eventually cancellations == [0, 1, 0]