diff --git a/Blockchain/.swiftpm/xcode/xcshareddata/xcschemes/Blockchain.xcscheme b/Blockchain/.swiftpm/xcode/xcshareddata/xcschemes/Blockchain.xcscheme
index e1d5352a..310f26cc 100644
--- a/Blockchain/.swiftpm/xcode/xcshareddata/xcschemes/Blockchain.xcscheme
+++ b/Blockchain/.swiftpm/xcode/xcshareddata/xcschemes/Blockchain.xcscheme
@@ -29,6 +29,18 @@
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES"
       shouldAutocreateTestPlan = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "BlockchainTests"
+               BuildableName = "BlockchainTests"
+               BlueprintName = "BlockchainTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
diff --git a/Blockchain/Sources/Blockchain/RuntimeProtocols/Guaranteeing.swift b/Blockchain/Sources/Blockchain/RuntimeProtocols/Guaranteeing.swift
index 867db13f..3f0bb05f 100644
--- a/Blockchain/Sources/Blockchain/RuntimeProtocols/Guaranteeing.swift
+++ b/Blockchain/Sources/Blockchain/RuntimeProtocols/Guaranteeing.swift
@@ -63,11 +63,11 @@ extension Guaranteeing {
         }
     }
 
-    private func toCoreAssignment(_ source: [UInt32], n: UInt32, max: UInt32) -> [CoreIndex] {
+    public static func toCoreAssignment(_ source: [UInt32], n: UInt32, max: UInt32) -> [CoreIndex] {
         source.map { CoreIndex(($0 + n) % max) }
     }
 
-    private func getCoreAssignment(config: ProtocolConfigRef, randomness: Data32, timeslot: TimeslotIndex) -> [CoreIndex] {
+    public static func getCoreAssignment(config: ProtocolConfigRef, randomness: Data32, timeslot: TimeslotIndex) -> [CoreIndex] {
         var source = Array(repeating: UInt32(0), count: config.value.totalNumberOfValidators)
         for i in 0 ..< config.value.totalNumberOfValidators {
             source[i] = UInt32(config.value.totalNumberOfCores * i / config.value.totalNumberOfValidators)
@@ -94,14 +94,14 @@ extension Guaranteeing {
     > {
         let coreAssignmentRotationPeriod = UInt32(config.value.coreAssignmentRotationPeriod)
 
-        let currentCoreAssignment = getCoreAssignment(config: config, randomness: entropyPool.t2, timeslot: timeslot)
+        let currentCoreAssignment = Self.getCoreAssignment(config: config, randomness: entropyPool.t2, timeslot: timeslot)
         let currentCoreKeys = withoutOffenders(keys: currentValidators.map(\.ed25519))
 
         let isEpochChanging = (timeslot % UInt32(config.value.epochLength)) < coreAssignmentRotationPeriod
         let previousRandomness = isEpochChanging ? entropyPool.t3 : entropyPool.t2
         let previousValidators = isEpochChanging ? previousValidators : currentValidators
 
-        let previousCoreAssignment = getCoreAssignment(
+        let previousCoreAssignment = Self.getCoreAssignment(
             config: config,
             randomness: previousRandomness,
             timeslot: timeslot - coreAssignmentRotationPeriod
diff --git a/Blockchain/Tests/BlockchainTests/GuaranteeingServiceTests.swift b/Blockchain/Tests/BlockchainTests/GuaranteeingServiceTests.swift
new file mode 100644
index 00000000..4bd24cbb
--- /dev/null
+++ b/Blockchain/Tests/BlockchainTests/GuaranteeingServiceTests.swift
@@ -0,0 +1,55 @@
+import Foundation
+import Testing
+import TracingUtils
+import Utils
+
+@testable import Blockchain
+
+struct GuaranteeingServiceTests {
+    func setup(
+        config: ProtocolConfigRef = .dev,
+        time: TimeInterval = 988,
+        keysCount: Int = 12
+    ) async throws -> (BlockchainServices, GuaranteeingService) {
+        let services = await BlockchainServices(
+            config: config,
+            timeProvider: MockTimeProvider(time: time),
+            keysCount: keysCount
+        )
+
+        let extrinsicPoolService = await ExtrinsicPoolService(
+            config: config,
+            dataProvider: services.dataProvider,
+            eventBus: services.eventBus
+        )
+
+        let runtime = Runtime(config: config)
+
+        let guaranteeingService = await GuaranteeingService(
+            config: config,
+            eventBus: services.eventBus,
+            scheduler: services.scheduler,
+            dataProvider: services.dataProvider,
+            keystore: services.keystore,
+            runtime: runtime,
+            extrinsicPool: extrinsicPoolService
+        )
+        return (services, guaranteeingService)
+    }
+
+    @Test func onGenesis() async throws {
+        let (services, validatorService) = try await setup()
+        let genesisState = services.genesisState
+        let storeMiddleware = services.storeMiddleware
+        let scheduler = services.scheduler
+
+        await validatorService.on(genesis: genesisState)
+
+        let events = await storeMiddleware.wait()
+
+        // Check if xxx events were published
+
+        // Check if block author tasks were scheduled
+        #expect(scheduler.taskCount == 0)
+    }
+}