[#1040] Implement ClearAlreadyScannedBlocksAction

- Implement ClearAlreadyScannedBlocksAction tests
- CompactBlockRepository mock added

Tests/OfflineTests/CompactBlockProcessorActions/ClearAlreadyScannedBlocksActionTests.swift

@@ -0,0 +1,40 @@
+//
+//  ClearAlreadyScannedBlocksActionTests.swift
+//  
+//
+//  Created by Lukáš Korba on 22.05.2023.
+//
+
+import XCTest
+@testable import TestUtils
+@testable import ZcashLightClientKit
+
+final class ClearAlreadyScannedBlocksActionTests: ZcashTestCase {
+    func testClearAlreadyScannedBlocksActionTests_NextAction() async throws {
+        let compactBlockRepositoryMock = CompactBlockRepositoryMock()
+        let transactionRepositoryMock = TransactionRepositoryMock()
+
+        compactBlockRepositoryMock.clearUpToClosure = { _ in }
+        transactionRepositoryMock.lastScannedHeightReturnValue = 1
+
+        mockContainer.mock(type: CompactBlockRepository.self, isSingleton: true) { _ in compactBlockRepositoryMock }
+        mockContainer.mock(type: TransactionRepository.self, isSingleton: true) { _ in transactionRepositoryMock }
+
+        let clearAlreadyScannedBlocksAction = ClearAlreadyScannedBlocksAction(
+            container: mockContainer
+        )
+
+        do {
+            let nextContext = try await clearAlreadyScannedBlocksAction.run(with: .init(state: .clearAlreadyScannedBlocks)) { _ in }
+            XCTAssertTrue(compactBlockRepositoryMock.clearUpToCalled, "storage.clear(upTo:) is expected to be called.")
+            XCTAssertTrue(transactionRepositoryMock.lastScannedHeightCalled, "transactionRepository.lastScannedHeight() is expected to be called.")
+            let nextState = await nextContext.state
+            XCTAssertTrue(
+                nextState == .enhance,
+                "nextContext after .clearAlreadyScannedBlocks is expected to be .enhance but received \(nextState)"
+            )
+        } catch {
+            XCTFail("testClearAlreadyScannedBlocksActionTests_NextAction is not expected to fail. \(error)")
+        }
+    }
+}