120 lines
5.2 KiB
FSharp
120 lines
5.2 KiB
FSharp
namespace NightLight.Core.Tests
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open NightLight.Core.Core
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open NightLight.Core.Tests.GenHelpers
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open NightLight.Core.Tests.TimeChangedGenerators
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open NightLight.Core.Tests.InteractionListGenerators
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open NightLight.Core.Models
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open FsCheck.Xunit
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open FsCheck.FSharp
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type NightLightTests() =
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let createFakeHomeWithNightLightAndInteract (interactions: Interaction list) =
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let mutable nightLightStateMachine = NightLightStateMachine()
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let fakeHome = FakeHome()
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fakeHome.OnEventPublished.Add(fun event ->
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match event |> nightLightStateMachine.OnEventReceived with
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| Ok(newState, commands) ->
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commands |> Seq.iter fakeHome.ProcessCommand
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nightLightStateMachine <- newState
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| Error error -> failwith $"Unexpected error {error}")
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fakeHome.Interact interactions
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fakeHome
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let doesLightHavePowerAfter light interactions =
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interactions
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|> Seq.choose (fun interaction ->
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match interaction with
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| HumanInteraction(LightPoweredOff l) when l = light -> Some false
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| HumanInteraction(LightPoweredOn l) when l = light -> Some true
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| _ -> None)
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|> Seq.tryLast
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|> Option.defaultValue false
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[<Property(Arbitrary = [| typeof<ArbitraryLight> |])>]
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let ``All lights should be either off, white or yellow during the day`` (light: Light) =
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concatGens
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[ genInitialInteractionsAndEndWith light =<< genTimeChangedToDay
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genInteractionsExcept light isTimeChangedToNight ]
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|> Arb.fromGen
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|> Prop.forAll
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<| fun interactions ->
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let fakeHome = createFakeHomeWithNightLightAndInteract interactions
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fakeHome.LightShouldHaveState light (function
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| Off -> true
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| On(_, color) -> color = White || color = Yellow)
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[<Property(Arbitrary = [| typeof<ArbitraryLight> |])>]
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let ``All lights should be either off or red during the night`` (light: Light) =
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concatGens
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[ genInitialInteractionsAndEndWith light =<< genTimeChangedToNight
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genInteractionsExcept light isTimeChangedToDay ]
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|> Arb.fromGen
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|> Prop.forAll
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<| fun interactions ->
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let fakeHome = createFakeHomeWithNightLightAndInteract interactions
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fakeHome.LightShouldHaveState light (function
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| Off -> true
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| On(_, color) -> color = Red)
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[<Property(Arbitrary = [| typeof<ArbitraryNonRemotelyControlledLight> |])>]
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let ``All non-remotely controlled lights should be on *if and only if* they have power`` (light: Light) =
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genInitialInteractions light |> Arb.fromGen |> Prop.forAll
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<| fun interactions ->
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let fakeHome = createFakeHomeWithNightLightAndInteract interactions
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doesLightHavePowerAfter light interactions = fakeHome.LightShouldHaveState light _.IsOn
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[<Property(Arbitrary = [| typeof<ArbitraryRemotelyControlledLight> |])>]
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let ``After pressing 'On' on the remote, if the 'Off' button isn't pressed, all remotely controlled lights with power should be on``
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(light: Light)
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=
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concatGens
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[ genInitialInteractionsAndEndWith light (HumanInteraction RemotePressedOnButton)
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genInteractionsExcept light ((=) (HumanInteraction RemotePressedOffButton)) ]
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|> Arb.fromGen
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|> Prop.forAll
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<| fun interactions ->
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let fakeHome = createFakeHomeWithNightLightAndInteract interactions
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doesLightHavePowerAfter light interactions
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==> fakeHome.LightShouldHaveState light _.IsOn
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[<Property(Arbitrary = [| typeof<ArbitraryRemotelyControlledLight> |])>]
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let ``After a new day starts, if the 'Off' button isn't pressed, all remotely controlled lights with power should be on``
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(light: Light)
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=
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concatGens
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[ genInitialInteractionsAndEndWith light =<< genTimeChangedToNight
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genInteractionsExcept light isTimeChangedToDay
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genTimeChangedToDay |> Gen.map List.singleton
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genInteractionsExcept light ((=) (HumanInteraction RemotePressedOffButton)) ]
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|> Arb.fromGen
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|> Prop.forAll
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<| fun interactions ->
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let fakeHome = createFakeHomeWithNightLightAndInteract interactions
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doesLightHavePowerAfter light interactions
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==> fakeHome.LightShouldHaveState light _.IsOn
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[<Property(Arbitrary = [| typeof<ArbitraryRemotelyControlledLight> |])>]
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let ``After pressing 'Off' on the remote, if the 'On' button isn't pressed and a new day doesn't start, all remotely controlled lights should be off``
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(light: Light)
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=
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concatGens
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[ genInitialInteractionsAndEndWith light (HumanInteraction RemotePressedOffButton)
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genInteractionsExcept light (fun interaction ->
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interaction = HumanInteraction RemotePressedOnButton
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|| interaction |> isTimeChangedToDay) ]
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|> Arb.fromGen
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|> Prop.forAll
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<| fun interactions ->
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let fakeHome = createFakeHomeWithNightLightAndInteract interactions
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fakeHome.LightShouldHaveState light _.IsOff
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