ShipmentTrackingProviderListMapper - Add unit tests.

Author: selanthiraiyan

Networking/NetworkingTests/Mapper/ShipmentTrackingProviderListMapperTests.swift

@@ -0,0 +1,64 @@
+import XCTest
+@testable import Networking
+
+/// ShipmentTrackingProviderListMapper Unit Tests
+///
+final class ShipmentTrackingProviderListMapperTests: XCTestCase {
+
+    /// Dummy Site ID.
+    ///
+    private let dummySiteID: Int64 = 424242
+
+    func test_provider_fields_are_properly_parsed() throws {
+        let shipmentTrackingProviders = try mapLoadShipmentTrackingProviderResponse()
+        XCTAssertEqual(shipmentTrackingProviders.count, 19)
+
+        let shipmentProviderGroup = try XCTUnwrap(shipmentTrackingProviders.first(where:) { $0.name ==  "Australia" })
+
+        XCTAssertEqual(shipmentProviderGroup.providers.count, 2)
+        XCTAssertTrue(shipmentProviderGroup.providers.contains(where: { $0.name == "Australia Post" }))
+        XCTAssertTrue(shipmentProviderGroup.providers.contains(where: { $0.name == "Fastway Couriers" }))
+    }
+
+    func test_provider_fields_are_properly_parsed_when_response_has_no_data_envelope() throws {
+        let shipmentTrackingProviders = try mapLoadShipmentTrackingProviderResponseWithoutDataEnvelope()
+        XCTAssertEqual(shipmentTrackingProviders.count, 19)
+
+        let shipmentProviderGroup = try XCTUnwrap(shipmentTrackingProviders.first(where:) { $0.name ==  "Australia" })
+
+        XCTAssertEqual(shipmentProviderGroup.providers.count, 2)
+        XCTAssertTrue(shipmentProviderGroup.providers.contains(where: { $0.name == "Australia Post" }))
+        XCTAssertTrue(shipmentProviderGroup.providers.contains(where: { $0.name == "Fastway Couriers" }))
+    }
+}
+
+/// Private Methods.
+///
+private extension ShipmentTrackingProviderListMapperTests {
+
+    /// Returns the ShipmentTrackingProviderListMapper output upon receiving `filename` (Data Encoded)
+    ///
+    func mapShipmentTrackingProvider(from filename: String) throws -> [ShipmentTrackingProviderGroup] {
+        guard let response = Loader.contentsOf(filename) else {
+            throw ParsingError.unableToLoadFile
+        }
+
+        return try! ShipmentTrackingProviderListMapper(siteID: dummySiteID).map(response: response)
+    }
+
+    /// Returns the ShipmentTrackingProviderListMapper output upon receiving `shipment_tracking_providers`
+    ///
+    func mapLoadShipmentTrackingProviderResponse() throws -> [ShipmentTrackingProviderGroup] {
+        try mapShipmentTrackingProvider(from: "shipment_tracking_providers")
+    }
+
+    /// Returns the ShipmentTrackingProviderListMapper output upon receiving `shipment_tracking_providers_without_data`
+    ///
+    func mapLoadShipmentTrackingProviderResponseWithoutDataEnvelope() throws -> [ShipmentTrackingProviderGroup] {
+        try mapShipmentTrackingProvider(from: "shipment_tracking_providers_without_data")
+    }
+}
+
+private enum ParsingError: Error {
+    case unableToLoadFile
+}