diff --git a/NightLight.Core.Tests/NightLightTests.fs b/NightLight.Core.Tests/NightLightTests.fs
index 7ad546b..a66d65e 100644
--- a/NightLight.Core.Tests/NightLightTests.fs
+++ b/NightLight.Core.Tests/NightLightTests.fs
@@ -1,5 +1,6 @@
 namespace NightLight.Core.Tests
 
+open Mutannot
 open NightLight.Core.Core
 open NightLight.Core.Tests.InteractionListGenerators
 open NightLight.Core.Tests.InteractionListHelpers
@@ -31,6 +32,7 @@ type NightLightTests() =
         fakeHome
 
     [<Property(Arbitrary = [| typeof<ArbitraryInteractions> |])>]
+    [<MutationCase("all-lights-right-color-night-is-yellow", "NightLight.Core/Moods.fs", 16, "Red", "Yellow")>]
     let ``All lights should either be off or have the right color`` (interactions: Interaction list) =
         let fakeHome = createFakeHomeWithNightLightAndInteract interactions
         let partOfDay = getPartOfDayAfterInteractions interactions
@@ -48,6 +50,7 @@ type NightLightTests() =
         |> Prop.trivial (fakeHome.LightsThatAreOn.Length = 0)
 
     [<Property(Arbitrary = [| typeof<ArbitraryInteractions> |], MaxTest = 500)>]
+    [<MutationCase("brightness-command-off-by-one", "NightLight.Core/ZigbeeCommands.fs", 40, "Brightness b -> b", "Brightness b -> b + 1")>]
     let ``All lights should either be off or have a brightness that fits its color`` (interactions: Interaction list) =
         let fakeHome = createFakeHomeWithNightLightAndInteract interactions
         let time = getTimeAfterInteractions interactions |> _.TimeOfDay
@@ -88,6 +91,7 @@ type NightLightTests() =
         |> Prop.trivial (fakeHome.LightsThatAreOn.Length = 0)
 
     [<Property(Arbitrary = [| typeof<ArbitraryInteractions> |], MaxTest = 500)>]
+    [<MutationCase("lights-default-to-off", "NightLight.Core/NightLightStateMachine.fs", 145, "light, On", "light, Off")>]
     let ``All lights with power should have the correct state`` (interactions: Interaction list) =
         let fakeHome = createFakeHomeWithNightLightAndInteract interactions