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statemachine_test.go
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statemachine_test.go
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package stateless
import (
"context"
"errors"
"fmt"
"reflect"
"sync"
"testing"
"github.com/stretchr/testify/assert"
)
const (
stateA = "A"
stateB = "B"
stateC = "C"
stateD = "D"
triggerX = "X"
triggerY = "Y"
triggerZ = "Z"
)
func TestTransition_IsReentry(t *testing.T) {
tests := []struct {
name string
t *Transition
want bool
}{
{"TransitionIsNotChange", &Transition{"1", "1", "0", false}, true},
{"TransitionIsChange", &Transition{"1", "2", "0", false}, false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.t.IsReentry(); got != tt.want {
t.Errorf("Transition.IsReentry() = %v, want %v", got, tt.want)
}
})
}
}
func TestStateMachine_NewStateMachine(t *testing.T) {
sm := NewStateMachine(stateA)
assert.Equal(t, stateA, sm.MustState())
}
func TestStateMachine_NewStateMachineWithExternalStorage(t *testing.T) {
var state State = stateB
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return state, nil
}, func(_ context.Context, s State) error {
state = s
return nil
}, FiringImmediate)
sm.Configure(stateB).Permit(triggerX, stateC)
assert.Equal(t, stateB, sm.MustState())
assert.Equal(t, stateB, state)
sm.Fire(triggerX)
assert.Equal(t, stateC, sm.MustState())
assert.Equal(t, stateC, state)
}
func TestStateMachine_Configure_SubstateIsIncludedInCurrentState(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).SubstateOf(stateC)
ok, _ := sm.IsInState(stateC)
assert.Equal(t, stateB, sm.MustState())
assert.True(t, ok)
}
func TestStateMachine_Configure_InSubstate_TriggerIgnoredInSuperstate_RemainsInSubstate(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).SubstateOf(stateC)
sm.Configure(stateC).Ignore(triggerX)
sm.Fire(triggerX)
assert.Equal(t, stateB, sm.MustState())
}
func TestStateMachine_CanFire(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).Permit(triggerX, stateA)
okX, _ := sm.CanFire(triggerX)
okY, _ := sm.CanFire(triggerY)
assert.True(t, okX)
assert.False(t, okY)
}
func TestStateMachine_CanFire_StatusError(t *testing.T) {
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return nil, errors.New("status error")
}, func(_ context.Context, s State) error { return nil }, FiringImmediate)
sm.Configure(stateB).Permit(triggerX, stateA)
ok, err := sm.CanFire(triggerX)
assert.False(t, ok)
assert.EqualError(t, err, "status error")
}
func TestStateMachine_IsInState_StatusError(t *testing.T) {
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return nil, errors.New("status error")
}, func(_ context.Context, s State) error { return nil }, FiringImmediate)
ok, err := sm.IsInState(stateA)
assert.False(t, ok)
assert.EqualError(t, err, "status error")
}
func TestStateMachine_Activate_StatusError(t *testing.T) {
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return nil, errors.New("status error")
}, func(_ context.Context, s State) error { return nil }, FiringImmediate)
assert.EqualError(t, sm.Activate(), "status error")
assert.EqualError(t, sm.Deactivate(), "status error")
}
func TestStateMachine_PermittedTriggers_StatusError(t *testing.T) {
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return nil, errors.New("status error")
}, func(_ context.Context, s State) error { return nil }, FiringImmediate)
_, err := sm.PermittedTriggers()
assert.EqualError(t, err, "status error")
}
func TestStateMachine_MustState_StatusError(t *testing.T) {
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return nil, errors.New("")
}, func(_ context.Context, s State) error { return nil }, FiringImmediate)
assert.Panics(t, func() { sm.MustState() })
}
func TestStateMachine_Fire_StatusError(t *testing.T) {
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return nil, errors.New("status error")
}, func(_ context.Context, s State) error { return nil }, FiringImmediate)
assert.EqualError(t, sm.Fire(triggerX), "status error")
}
func TestStateMachine_Configure_PermittedTriggersIncludeSuperstatePermittedTriggers(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateA).Permit(triggerZ, stateB)
sm.Configure(stateB).SubstateOf(stateC).Permit(triggerX, stateA)
sm.Configure(stateC).Permit(triggerY, stateA)
permitted, _ := sm.PermittedTriggers(context.Background())
assert.Contains(t, permitted, triggerX)
assert.Contains(t, permitted, triggerY)
assert.NotContains(t, permitted, triggerZ)
}
func TestStateMachine_PermittedTriggers_PermittedTriggersAreDistinctValues(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).SubstateOf(stateC).Permit(triggerX, stateA)
sm.Configure(stateC).Permit(triggerX, stateB)
permitted, _ := sm.PermittedTriggers(context.Background())
assert.Len(t, permitted, 1)
assert.Equal(t, permitted[0], triggerX)
}
func TestStateMachine_PermittedTriggers_AcceptedTriggersRespectGuards(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).Permit(triggerX, stateA, func(_ context.Context, _ ...interface{}) bool {
return false
})
permitted, _ := sm.PermittedTriggers(context.Background())
assert.Len(t, permitted, 0)
}
func TestStateMachine_PermittedTriggers_AcceptedTriggersRespectMultipleGuards(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).Permit(triggerX, stateA, func(_ context.Context, _ ...interface{}) bool {
return true
}, func(_ context.Context, _ ...interface{}) bool {
return false
})
permitted, _ := sm.PermittedTriggers(context.Background())
assert.Len(t, permitted, 0)
}
func TestStateMachine_Fire_DiscriminatedByGuard_ChoosesPermitedTransition(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).
Permit(triggerX, stateA, func(_ context.Context, _ ...interface{}) bool {
return false
}).
Permit(triggerX, stateC, func(_ context.Context, _ ...interface{}) bool {
return true
})
sm.Fire(triggerX)
assert.Equal(t, stateC, sm.MustState())
}
func TestStateMachine_Fire_SaveError(t *testing.T) {
sm := NewStateMachineWithExternalStorage(func(_ context.Context) (State, error) {
return stateB, nil
}, func(_ context.Context, s State) error { return errors.New("status error") }, FiringImmediate)
sm.Configure(stateB).
Permit(triggerX, stateA)
assert.EqualError(t, sm.Fire(triggerX), "status error")
assert.Equal(t, stateB, sm.MustState())
}
func TestStateMachine_Fire_TriggerIsIgnored_ActionsNotExecuted(t *testing.T) {
fired := false
sm := NewStateMachine(stateB)
sm.Configure(stateB).
OnEntry(func(_ context.Context, _ ...interface{}) error {
fired = true
return nil
}).
Ignore(triggerX)
sm.Fire(triggerX)
assert.False(t, fired)
}
func TestStateMachine_Fire_SelfTransitionPermited_ActionsFire(t *testing.T) {
fired := false
sm := NewStateMachine(stateB)
sm.Configure(stateB).
OnEntry(func(_ context.Context, _ ...interface{}) error {
fired = true
return nil
}).
PermitReentry(triggerX)
sm.Fire(triggerX)
assert.True(t, fired)
}
func TestStateMachine_Fire_ImplicitReentryIsDisallowed(t *testing.T) {
sm := NewStateMachine(stateB)
assert.Panics(t, func() {
sm.Configure(stateB).
Permit(triggerX, stateB)
})
}
func TestStateMachine_Fire_ErrorForInvalidTransition(t *testing.T) {
sm := NewStateMachine(stateA)
assert.Error(t, sm.Fire(triggerX))
}
func TestStateMachine_Fire_ErrorForInvalidTransitionMentionsGuardDescriptionIfPresent(t *testing.T) {
sm := NewStateMachine(stateA)
sm.Configure(stateA).Permit(triggerX, stateB, func(_ context.Context, _ ...interface{}) bool {
return false
})
assert.Error(t, sm.Fire(triggerX))
}
func TestStateMachine_Fire_ParametersSuppliedToFireArePassedToEntryAction(t *testing.T) {
sm := NewStateMachine(stateB)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(""), reflect.TypeOf(0))
sm.Configure(stateB).Permit(triggerX, stateC)
var (
entryArg1 string
entryArg2 int
)
sm.Configure(stateC).OnEntryFrom(triggerX, func(_ context.Context, args ...interface{}) error {
entryArg1 = args[0].(string)
entryArg2 = args[1].(int)
return nil
})
suppliedArg1, suppliedArg2 := "something", 2
sm.Fire(triggerX, suppliedArg1, suppliedArg2)
assert.Equal(t, suppliedArg1, entryArg1)
assert.Equal(t, suppliedArg2, entryArg2)
}
func TestStateMachine_OnUnhandledTrigger_TheProvidedHandlerIsCalledWithStateAndTrigger(t *testing.T) {
sm := NewStateMachine(stateB)
var (
unhandledState State
unhandledTrigger Trigger
)
sm.OnUnhandledTrigger(func(_ context.Context, state State, trigger Trigger, unmetGuards []string) error {
unhandledState = state
unhandledTrigger = trigger
return nil
})
sm.Fire(triggerZ)
assert.Equal(t, stateB, unhandledState)
assert.Equal(t, triggerZ, unhandledTrigger)
}
func TestStateMachine_SetTriggerParameters_TriggerParametersAreImmutableOnceSet(t *testing.T) {
sm := NewStateMachine(stateB)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(""), reflect.TypeOf(0))
assert.Panics(t, func() { sm.SetTriggerParameters(triggerX, reflect.TypeOf(""), reflect.TypeOf(0)) })
}
func TestStateMachine_SetTriggerParameters_Interfaces(t *testing.T) {
sm := NewStateMachine(stateB)
sm.SetTriggerParameters(triggerX, reflect.TypeOf((*error)(nil)).Elem())
sm.Configure(stateB).Permit(triggerX, stateA)
assert.NotPanics(t, func() { sm.Fire(triggerX, errors.New("failed")) })
}
func TestStateMachine_SetTriggerParameters_Invalid(t *testing.T) {
sm := NewStateMachine(stateB)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(""), reflect.TypeOf(0))
sm.Configure(stateB).Permit(triggerX, stateA)
assert.Panics(t, func() { sm.Fire(triggerX) })
assert.Panics(t, func() { sm.Fire(triggerX, "1", "2", "3") })
assert.Panics(t, func() { sm.Fire(triggerX, "1", "2") })
}
func TestStateMachine_OnTransitioning_EventFires(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).Permit(triggerX, stateA)
var transition Transition
sm.OnTransitioning(func(_ context.Context, tr Transition) {
transition = tr
})
sm.Fire(triggerX)
assert.NotZero(t, transition)
assert.Equal(t, triggerX, transition.Trigger)
assert.Equal(t, stateB, transition.Source)
assert.Equal(t, stateA, transition.Destination)
}
func TestStateMachine_OnTransitioned_EventFires(t *testing.T) {
sm := NewStateMachine(stateB)
sm.Configure(stateB).Permit(triggerX, stateA)
var transition Transition
sm.OnTransitioned(func(_ context.Context, tr Transition) {
transition = tr
})
sm.Fire(triggerX)
assert.NotZero(t, transition)
assert.Equal(t, triggerX, transition.Trigger)
assert.Equal(t, stateB, transition.Source)
assert.Equal(t, stateA, transition.Destination)
}
func TestStateMachine_OnTransitioned_EventFiresBeforeTheOnEntryEvent(t *testing.T) {
sm := NewStateMachine(stateB)
expectedOrdering := []string{"OnExit", "OnTransitioning", "OnEntry", "OnTransitioned"}
var actualOrdering []string
sm.Configure(stateB).Permit(triggerX, stateA).OnExit(func(_ context.Context, args ...interface{}) error {
actualOrdering = append(actualOrdering, "OnExit")
return nil
}).Machine()
var transition Transition
sm.Configure(stateA).OnEntry(func(ctx context.Context, args ...interface{}) error {
actualOrdering = append(actualOrdering, "OnEntry")
transition = GetTransition(ctx)
return nil
})
sm.OnTransitioning(func(_ context.Context, tr Transition) {
actualOrdering = append(actualOrdering, "OnTransitioning")
})
sm.OnTransitioned(func(_ context.Context, tr Transition) {
actualOrdering = append(actualOrdering, "OnTransitioned")
})
sm.Fire(triggerX)
assert.Equal(t, expectedOrdering, actualOrdering)
assert.Equal(t, triggerX, transition.Trigger)
assert.Equal(t, stateB, transition.Source)
assert.Equal(t, stateA, transition.Destination)
}
func TestStateMachine_SubstateOf_DirectCyclicConfigurationDetected(t *testing.T) {
sm := NewStateMachine(stateA)
assert.Panics(t, func() { sm.Configure(stateA).SubstateOf(stateA) })
}
func TestStateMachine_SubstateOf_NestedCyclicConfigurationDetected(t *testing.T) {
sm := NewStateMachine(stateA)
sm.Configure(stateB).SubstateOf(stateA)
assert.Panics(t, func() { sm.Configure(stateA).SubstateOf(stateB) })
}
func TestStateMachine_SubstateOf_NestedTwoLevelsCyclicConfigurationDetected(t *testing.T) {
sm := NewStateMachine(stateA)
sm.Configure(stateB).SubstateOf(stateA)
sm.Configure(stateC).SubstateOf(stateB)
assert.Panics(t, func() { sm.Configure(stateA).SubstateOf(stateC) })
}
func TestStateMachine_SubstateOf_DelayedNestedCyclicConfigurationDetected(t *testing.T) {
sm := NewStateMachine(stateA)
sm.Configure(stateB).SubstateOf(stateA)
sm.Configure(stateC)
sm.Configure(stateA).SubstateOf(stateC)
assert.Panics(t, func() { sm.Configure(stateC).SubstateOf(stateB) })
}
func TestStateMachine_Fire_IgnoreVsPermitReentry(t *testing.T) {
sm := NewStateMachine(stateA)
var calls int
sm.Configure(stateA).
OnEntry(func(_ context.Context, _ ...interface{}) error {
calls += 1
return nil
}).
PermitReentry(triggerX).
Ignore(triggerY)
sm.Fire(triggerX)
sm.Fire(triggerY)
assert.Equal(t, calls, 1)
}
func TestStateMachine_Fire_IgnoreVsPermitReentryFrom(t *testing.T) {
sm := NewStateMachine(stateA)
var calls int
sm.Configure(stateA).
OnEntryFrom(triggerX, func(_ context.Context, _ ...interface{}) error {
calls += 1
return nil
}).
OnEntryFrom(triggerY, func(_ context.Context, _ ...interface{}) error {
calls += 1
return nil
}).
PermitReentry(triggerX).
Ignore(triggerY)
sm.Fire(triggerX)
sm.Fire(triggerY)
assert.Equal(t, calls, 1)
}
func TestStateMachine_Fire_IfSelfTransitionPermited_ActionsFire_InSubstate(t *testing.T) {
sm := NewStateMachine(stateA)
var onEntryStateBfired, onExitStateBfired, onExitStateAfired bool
sm.Configure(stateB).
OnEntry(func(_ context.Context, _ ...interface{}) error {
onEntryStateBfired = true
return nil
}).
PermitReentry(triggerX).
OnExit(func(_ context.Context, _ ...interface{}) error {
onExitStateBfired = true
return nil
})
sm.Configure(stateA).
SubstateOf(stateB).
OnExit(func(_ context.Context, _ ...interface{}) error {
onExitStateAfired = true
return nil
})
sm.Fire(triggerX)
assert.Equal(t, stateB, sm.MustState())
assert.True(t, onEntryStateBfired)
assert.True(t, onExitStateBfired)
assert.True(t, onExitStateAfired)
}
func TestStateMachine_Fire_TransitionWhenParameterizedGuardTrue(t *testing.T) {
sm := NewStateMachine(stateA)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(0))
sm.Configure(stateA).
Permit(triggerX, stateB, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) == 2
})
sm.Fire(triggerX, 2)
assert.Equal(t, stateB, sm.MustState())
}
func TestStateMachine_Fire_ErrorWhenParameterizedGuardFalse(t *testing.T) {
sm := NewStateMachine(stateA)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(0))
sm.Configure(stateA).
Permit(triggerX, stateB, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) == 3
})
sm.Fire(triggerX, 2)
assert.Error(t, sm.Fire(triggerX, 2))
}
func TestStateMachine_Fire_TransitionWhenBothParameterizedGuardClausesTrue(t *testing.T) {
sm := NewStateMachine(stateA)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(0))
sm.Configure(stateA).
Permit(triggerX, stateB, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) == 2
}, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) != 3
})
sm.Fire(triggerX, 2)
assert.Equal(t, stateB, sm.MustState())
}
func TestStateMachine_Fire_TransitionWhenGuardReturnsTrueOnTriggerWithMultipleParameters(t *testing.T) {
sm := NewStateMachine(stateA)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(""), reflect.TypeOf(0))
sm.Configure(stateA).
Permit(triggerX, stateB, func(_ context.Context, args ...interface{}) bool {
return args[0].(string) == "3" && args[1].(int) == 2
})
sm.Fire(triggerX, "3", 2)
assert.Equal(t, stateB, sm.MustState())
}
func TestStateMachine_Fire_TransitionWhenPermitDyanmicIfHasMultipleExclusiveGuards(t *testing.T) {
sm := NewStateMachine(stateA)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(0))
sm.Configure(stateA).
PermitDynamic(triggerX, func(_ context.Context, args ...interface{}) (State, error) {
if args[0].(int) == 3 {
return stateB, nil
}
return stateC, nil
}, func(_ context.Context, args ...interface{}) bool { return args[0].(int) == 3 || args[0].(int) == 5 }).
PermitDynamic(triggerX, func(_ context.Context, args ...interface{}) (State, error) {
if args[0].(int) == 2 {
return stateC, nil
}
return stateD, nil
}, func(_ context.Context, args ...interface{}) bool { return args[0].(int) == 2 || args[0].(int) == 4 })
sm.Fire(triggerX, 3)
assert.Equal(t, stateB, sm.MustState())
}
func TestStateMachine_Fire_PermitDyanmic_Error(t *testing.T) {
sm := NewStateMachine(stateA)
sm.Configure(stateA).
PermitDynamic(triggerX, func(_ context.Context, _ ...interface{}) (State, error) {
return nil, errors.New("")
})
assert.Error(t, sm.Fire(triggerX), "")
assert.Equal(t, stateA, sm.MustState())
}
func TestStateMachine_Fire_PanicsWhenPermitDyanmicIfHasMultipleNonExclusiveGuards(t *testing.T) {
sm := NewStateMachine(stateA)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(0))
sm.Configure(stateA).
PermitDynamic(triggerX, func(_ context.Context, args ...interface{}) (State, error) {
if args[0].(int) == 4 {
return stateB, nil
}
return stateC, nil
}, func(_ context.Context, args ...interface{}) bool { return args[0].(int)%2 == 0 }).
PermitDynamic(triggerX, func(_ context.Context, args ...interface{}) (State, error) {
if args[0].(int) == 2 {
return stateC, nil
}
return stateD, nil
}, func(_ context.Context, args ...interface{}) bool { return args[0].(int) == 2 })
assert.Panics(t, func() { sm.Fire(triggerX, 2) })
}
func TestStateMachine_Fire_TransitionWhenPermitIfHasMultipleExclusiveGuardsWithSuperStateTrue(t *testing.T) {
sm := NewStateMachine(stateB)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(0))
sm.Configure(stateA).
Permit(triggerX, stateD, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) == 3
})
sm.Configure(stateB).
SubstateOf(stateA).
Permit(triggerX, stateC, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) == 2
})
sm.Fire(triggerX, 3)
assert.Equal(t, stateD, sm.MustState())
}
func TestStateMachine_Fire_TransitionWhenPermitIfHasMultipleExclusiveGuardsWithSuperStateFalse(t *testing.T) {
sm := NewStateMachine(stateB)
sm.SetTriggerParameters(triggerX, reflect.TypeOf(0))
sm.Configure(stateA).
Permit(triggerX, stateD, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) == 3
})
sm.Configure(stateB).
SubstateOf(stateA).
Permit(triggerX, stateC, func(_ context.Context, args ...interface{}) bool {
return args[0].(int) == 2
})
sm.Fire(triggerX, 2)
assert.Equal(t, stateC, sm.MustState())
}
func TestStateMachine_Fire_TransitionToSuperstateDoesNotExitSuperstate(t *testing.T) {
sm := NewStateMachine(stateB)
var superExit, superEntry, subExit bool
sm.Configure(stateA).
OnEntry(func(_ context.Context, _ ...interface{}) error {
superEntry = true
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
superExit = true
return nil
})
sm.Configure(stateB).
SubstateOf(stateA).
Permit(triggerY, stateA).
OnExit(func(_ context.Context, _ ...interface{}) error {
subExit = true
return nil
})
sm.Fire(triggerY)
assert.True(t, subExit)
assert.False(t, superEntry)
assert.False(t, superExit)
}
func TestStateMachine_Fire_OnExitFiresOnlyOnceReentrySubstate(t *testing.T) {
sm := NewStateMachine(stateA)
var exitB, exitA, entryB, entryA int
sm.Configure(stateA).
SubstateOf(stateB).
OnEntry(func(_ context.Context, _ ...interface{}) error {
entryA += 1
return nil
}).
PermitReentry(triggerX).
OnExit(func(_ context.Context, _ ...interface{}) error {
exitA += 1
return nil
})
sm.Configure(stateB).
OnEntry(func(_ context.Context, _ ...interface{}) error {
entryB += 1
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
exitB += 1
return nil
})
sm.Fire(triggerX)
assert.Equal(t, 0, exitB)
assert.Equal(t, 0, entryB)
assert.Equal(t, 1, exitA)
assert.Equal(t, 1, entryA)
}
func TestStateMachine_Activate(t *testing.T) {
sm := NewStateMachine(stateA)
expectedOrdering := []string{"ActivatedC", "ActivatedA"}
var actualOrdering []string
sm.Configure(stateA).
SubstateOf(stateC).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedA")
return nil
})
sm.Configure(stateC).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedC")
return nil
})
// should not be called for activation
sm.OnTransitioning(func(_ context.Context, _ Transition) {
actualOrdering = append(actualOrdering, "OnTransitioning")
})
sm.OnTransitioned(func(_ context.Context, _ Transition) {
actualOrdering = append(actualOrdering, "OnTransitioned")
})
sm.Activate()
assert.Equal(t, expectedOrdering, actualOrdering)
}
func TestStateMachine_Activate_Error(t *testing.T) {
sm := NewStateMachine(stateA)
var actualOrdering []string
sm.Configure(stateA).
SubstateOf(stateC).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedA")
return errors.New("")
})
sm.Configure(stateC).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedC")
return nil
})
assert.Error(t, sm.Activate())
}
func TestStateMachine_Activate_Idempotent(t *testing.T) {
sm := NewStateMachine(stateA)
var actualOrdering []string
sm.Configure(stateA).
SubstateOf(stateC).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedA")
return nil
})
sm.Configure(stateC).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedC")
return nil
})
sm.Activate()
assert.Len(t, actualOrdering, 2)
}
func TestStateMachine_Deactivate(t *testing.T) {
sm := NewStateMachine(stateA)
expectedOrdering := []string{"DeactivatedA", "DeactivatedC"}
var actualOrdering []string
sm.Configure(stateA).
SubstateOf(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedA")
return nil
})
sm.Configure(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedC")
return nil
})
// should not be called for activation
sm.OnTransitioning(func(_ context.Context, _ Transition) {
actualOrdering = append(actualOrdering, "OnTransitioning")
})
sm.OnTransitioned(func(_ context.Context, _ Transition) {
actualOrdering = append(actualOrdering, "OnTransitioned")
})
sm.Activate()
sm.Deactivate()
assert.Equal(t, expectedOrdering, actualOrdering)
}
func TestStateMachine_Deactivate_NoActivated(t *testing.T) {
sm := NewStateMachine(stateA)
var actualOrdering []string
sm.Configure(stateA).
SubstateOf(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedA")
return nil
})
sm.Configure(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedC")
return nil
})
sm.Deactivate()
assert.Equal(t, actualOrdering, []string{"DeactivatedA", "DeactivatedC"})
}
func TestStateMachine_Deactivate_Error(t *testing.T) {
sm := NewStateMachine(stateA)
var actualOrdering []string
sm.Configure(stateA).
SubstateOf(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedA")
return errors.New("")
})
sm.Configure(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedC")
return nil
})
sm.Activate()
assert.Error(t, sm.Deactivate())
}
func TestStateMachine_Deactivate_Idempotent(t *testing.T) {
sm := NewStateMachine(stateA)
var actualOrdering []string
sm.Configure(stateA).
SubstateOf(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedA")
return nil
})
sm.Configure(stateC).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedC")
return nil
})
sm.Activate()
sm.Deactivate()
actualOrdering = make([]string, 0)
sm.Activate()
assert.Empty(t, actualOrdering)
}
func TestStateMachine_Activate_Transitioning(t *testing.T) {
sm := NewStateMachine(stateA)
var actualOrdering []string
expectedOrdering := []string{"ActivatedA", "ExitedA", "OnTransitioning", "EnteredB", "OnTransitioned",
"ExitedB", "OnTransitioning", "EnteredA", "OnTransitioned"}
sm.Configure(stateA).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedA")
return nil
}).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedA")
return nil
}).
OnEntry(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "EnteredA")
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "ExitedA")
return nil
}).
Permit(triggerX, stateB)
sm.Configure(stateB).
OnActive(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "ActivatedB")
return nil
}).
OnDeactivate(func(_ context.Context) error {
actualOrdering = append(actualOrdering, "DeactivatedB")
return nil
}).
OnEntry(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "EnteredB")
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "ExitedB")
return nil
}).
Permit(triggerY, stateA)
sm.OnTransitioning(func(_ context.Context, _ Transition) {
actualOrdering = append(actualOrdering, "OnTransitioning")
})
sm.OnTransitioned(func(_ context.Context, _ Transition) {
actualOrdering = append(actualOrdering, "OnTransitioned")
})
sm.Activate()
sm.Fire(triggerX)
sm.Fire(triggerY)
assert.Equal(t, expectedOrdering, actualOrdering)
}
func TestStateMachine_Fire_ImmediateEntryAProcessedBeforeEnterB(t *testing.T) {
sm := NewStateMachineWithMode(stateA, FiringImmediate)
var actualOrdering []string
expectedOrdering := []string{"ExitA", "ExitB", "EnterA", "EnterB"}
sm.Configure(stateA).
OnEntry(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "EnterA")
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "ExitA")
return nil
}).
Permit(triggerX, stateB)
sm.Configure(stateB).
OnEntry(func(_ context.Context, _ ...interface{}) error {
sm.Fire(triggerY)
actualOrdering = append(actualOrdering, "EnterB")
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "ExitB")
return nil
}).
Permit(triggerY, stateA)
sm.Fire(triggerX)
assert.Equal(t, expectedOrdering, actualOrdering)
}
func TestStateMachine_Fire_QueuedEntryAProcessedBeforeEnterB(t *testing.T) {
sm := NewStateMachineWithMode(stateA, FiringQueued)
var actualOrdering []string
expectedOrdering := []string{"ExitA", "EnterB", "ExitB", "EnterA"}
sm.Configure(stateA).
OnEntry(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "EnterA")
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "ExitA")
return nil
}).
Permit(triggerX, stateB)
sm.Configure(stateB).
OnEntry(func(_ context.Context, _ ...interface{}) error {
sm.Fire(triggerY)
actualOrdering = append(actualOrdering, "EnterB")
return nil
}).
OnExit(func(_ context.Context, _ ...interface{}) error {
actualOrdering = append(actualOrdering, "ExitB")
return nil