Testing ViewModels

CustomerEntryViewModelTests.swift

import Foundation
@testable import Shopify_POS

class CustomerEntryViewModelTests: XCTestCase {
	var viewModel: CustomerEntryViewModel!
	
	override func setUp() {
		super.setUp()
		viewModel = CustomerEntryViewModel(/* mock properties */)
	}

  	func testTaxExemptIsFalseByDefault() {
		XCTAssertFalse(viewModel.taxExempt)
	}
  
  	func testIsValidReturnsFalseForInvalidPhone() {
		viewModel.firstName = "First Name"
		viewModel.phone = "9820"
		XCTAssertFalse(viewModel.isValid)
		viewModel.phone = "9028025170"
		XCTAssertTrue(viewModel.isValid)
	}
}