[#1041] Implement ClearCacheAction

- ClearCacheAction tests
- CompactBlockRepository mock added

Tests/OfflineTests/CompactBlockProcessorActions/ClearCacheActionTests.swift

@@ -0,0 +1,36 @@
+//
+//  ClearCacheActionTests.swift
+//  
+//
+//  Created by Lukáš Korba on 22.05.2023.
+//
+
+import XCTest
+@testable import TestUtils
+@testable import ZcashLightClientKit
+
+final class ClearCacheActionTests: ZcashTestCase {
+    func testClearCacheActionTests_NextAction() async throws {
+        let compactBlockRepositoryMock = CompactBlockRepositoryMock()
+
+        compactBlockRepositoryMock.clearClosure = { }
+
+        mockContainer.mock(type: CompactBlockRepository.self, isSingleton: true) { _ in compactBlockRepositoryMock }
+
+        let clearCacheAction = ClearCacheAction(
+            container: mockContainer
+        )
+
+        do {
+            let nextContext = try await clearCacheAction.run(with: .init(state: .clearCache)) { _ in }
+            XCTAssertTrue(compactBlockRepositoryMock.clearCalled, "storage.clear() is expected to be called.")
+            let nextState = await nextContext.state
+            XCTAssertTrue(
+                nextState == .finished,
+                "nextContext after .clearCache is expected to be .finished but received \(nextState)"
+            )
+        } catch {
+            XCTFail("testClearCacheActionTests_NextAction is not expected to fail. \(error)")
+        }
+    }
+}