test(): implemented remote image service error test

Author: Christian Elies

Tests/RemoteImageTests/Models/RemoteImageServiceErrorTests.swift

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+//
+//  RemoteImageServiceErrorTests.swift
+//  RemoteImageTests
+//
+//  Created by Christian Elies on 14.12.19.
+//
+
+@testable import RemoteImage
+import XCTest
+
+final class RemoteImageServiceErrorTests: XCTestCase {
+    func testCouldNotCreateImageDescription() {
+        let description = RemoteImageServiceError.couldNotCreateImage.errorDescription
+        let expectedDescription = "Could not create image from received data"
+        XCTAssertEqual(description, expectedDescription)
+    }
+}