test(): implemented photo kit service error tests

Author: Christian Elies

Tests/RemoteImageTests/Models/PhotoKitServiceErrorTests.swift

@@ -0,0 +1,64 @@
+//
+//  PhotoKitServiceErrorTests.swift
+//  RemoteImageTests
+//
+//  Created by Christian Elies on 14.12.19.
+//
+
+@testable import RemoteImage
+import XCTest
+
+final class PhotoKitServiceErrorTests: XCTestCase {
+    let localIdentifier = "TestIdentifier"
+
+    func testMissingDataErrorDescription() {
+        let error: PhotoKitServiceError = .missingData
+        let expectedErrorDescription = "The asset could not be loaded."
+        XCTAssertEqual(error.errorDescription, expectedErrorDescription)
+    }
+
+    func testMissingDataFailureReason() {
+        let error: PhotoKitServiceError = .missingData
+        let expectedFailureReason = "The asset data could not be fetched. Maybe you are not connected to the internet."
+        XCTAssertEqual(error.failureReason, expectedFailureReason)
+    }
+
+    func testMissingDataRecoverySuggestion() {
+        let error: PhotoKitServiceError = .missingData
+        let expectedRecoverySuggestion = "Check your internet connection or try again later."
+        XCTAssertEqual(error.recoverySuggestion, expectedRecoverySuggestion)
+    }
+
+    func testMissingDataErrorCode() {
+        let error: PhotoKitServiceError = .missingData
+        let expectedErrorCode: Int = 0
+        XCTAssertEqual(error.errorCode, expectedErrorCode)
+    }
+
+    func testPhAssetNotFoundErrorDescription() {
+        let error: PhotoKitServiceError = .phAssetNotFound(localIdentifier: localIdentifier)
+        let expectedErrorDescription = "A PHAsset with the identifier \(localIdentifier) was not found."
+        XCTAssertEqual(error.errorDescription, expectedErrorDescription)
+    }
+
+    func testPhAssetNotFoundFailureReason() {
+        let error: PhotoKitServiceError = .phAssetNotFound(localIdentifier: localIdentifier)
+        let expectedFailureReason = "An asset with the identifier \(localIdentifier) doesn't exist anymore."
+        XCTAssertEqual(error.failureReason, expectedFailureReason)
+    }
+
+    func testPhAssetNotFoundRecoverySuggestion() {
+        let error: PhotoKitServiceError = .phAssetNotFound(localIdentifier: localIdentifier)
+        XCTAssertNil(error.recoverySuggestion)
+    }
+
+    func testPhAssetNotFoundErrorCode() {
+        let error: PhotoKitServiceError = .phAssetNotFound(localIdentifier: localIdentifier)
+        let expectedErrorCode: Int = 1
+        XCTAssertEqual(error.errorCode, expectedErrorCode)
+    }
+
+    func testErrorDomain() {
+        XCTAssertEqual(PhotoKitServiceError.errorDomain, String(describing: PhotoKitService.self))
+    }
+}