Add tests for unknown version and battery level

Author: allendav

WooCommerce/WooCommerceTests/Mocks/MockCardReader.swift

@@ -10,4 +10,14 @@ struct MockCardReader {
                    batteryLevel: 0.5,
                    readerType: .mobile)
     }
+
+    static func bbposChipper2XBTNoVerNoBatt() -> CardReader {
+        CardReader(serial: "WPE-SIMULATOR-1",
+                   vendorIdentifier: "SIMULATOR",
+                   name: "Simulated POS E",
+                   status: .init(connected: false, remembered: false),
+                   softwareVersion: nil,
+                   batteryLevel: nil,
+                   readerType: .mobile)
+    }
 }

WooCommerce/WooCommerceTests/ViewRelated/Dashboard/CardReaderSettings/CardReaderSettingsConnectedViewModelTests.swift

@@ -51,6 +51,18 @@ final class CardReaderSettingsConnectedViewModelTests: XCTestCase {
         XCTAssertEqual(viewModel.connectedReaderBatteryLevel, "50% Battery")
     }
 
+    func test_view_model_correctly_formats_connected_card_reader_battery_level_when_nil() {
+        let mockStoresManager = MockCardPresentPaymentsStoresManager(
+            connectedReaders: [MockCardReader.bbposChipper2XBTNoVerNoBatt()],
+            discoveredReaders: [],
+            sessionManager: SessionManager.testingInstance
+        )
+        ServiceLocator.setStores(mockStoresManager)
+
+        let viewModel = CardReaderSettingsConnectedViewModel(didChangeShouldShow: nil)
+        XCTAssertEqual(viewModel.connectedReaderBatteryLevel, "Unknown Battery Level")
+    }
+
     func test_view_model_correctly_formats_connected_card_reader_software_version() {
         let mockStoresManager = MockCardPresentPaymentsStoresManager(
             connectedReaders: [MockCardReader.bbposChipper2XBT()],
@@ -63,6 +75,18 @@ final class CardReaderSettingsConnectedViewModelTests: XCTestCase {
         XCTAssertEqual(viewModel.connectedReaderSoftwareVersion, "Version: 1.00.03.34-SZZZ_Generic_v45-300001")
     }
 
+    func test_view_model_correctly_formats_connected_card_reader_software_version_when_nil() {
+        let mockStoresManager = MockCardPresentPaymentsStoresManager(
+            connectedReaders: [MockCardReader.bbposChipper2XBTNoVerNoBatt()],
+            discoveredReaders: [],
+            sessionManager: SessionManager.testingInstance
+        )
+        ServiceLocator.setStores(mockStoresManager)
+
+        let viewModel = CardReaderSettingsConnectedViewModel(didChangeShouldShow: nil)
+        XCTAssertEqual(viewModel.connectedReaderSoftwareVersion, "Unknown Software Version")
+    }
+
     func test_checkForCardReaderUpdate_properly_handles_update_available() {
         // Given
         let expectation = self.expectation(description: #function)