测试案例一

创建一个单元测试

    func testExample() throws {
        let personID:String = "0123456789"
        let count = personID.count
        XCTAssert(count <= 10, "ID length error.")
        // This is an example of a functional test case.
        // Use XCTAssert and related functions to verify your tests produce the correct results.
        // Any test you write for XCTest can be annotated as throws and async.
        // Mark your test throws to produce an unexpected failure when your test encounters an uncaught error.
        // Mark your test async to allow awaiting for asynchronous code to complete. Check the results with assertions afterwards.
    }

常用的一些断言

XCTAssertEqualObjects：当两个对象不相等或者是其中一个对象为nil时，断言失败。
XCTAssertEquals：当参数1不等于参数2时断言失败，用于基本数据测试。
XCTAssertNil：当参数不是nil时，断言失败。
XCTAssertNotNil：当参数是nil时，断言失败。
XCTAssertTrue：当表达式为false时，断言失败。
XCTAssertFalse：当表达式为true时，断言失败。
XCTAssertThrows：如果表达式没有抛出异常，则断言失败。
XCTAssertNoThrow：如果表达式抛出异常，则断言失败

测试案例二

EmailUtil.swift

import Foundation

class EmailUtil {
    func validateEmail(email:String) -> Bool {
        //这里传入的参数，需要补充一下关于正则表达式的一些相关知识，学习链接放在文末。
        let pattern = "^([a-z0-9_\\.-]+)@([\\da-z\\.-]+)\\.([a-z\\.]{2,6})$"
        
        let matcher = RegexHelper(pattern: pattern)
        
        let result = matcher.match(input: email)
        
        if result {
            return true
        }else{
            return false
        }
    }
}

RegexHelper.swift

import Foundation

struct RegexHelper {
    let regex : NSRegularExpression?
    
    init(pattern:String) {
        do {
            regex = try NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options.caseInsensitive)
        } catch {
            regex = nil
        }
    }
    
    func match(input:String) -> Bool {
        let matches = regex?.matches(in: input, options: NSRegularExpression.MatchingOptions.reportProgress, range: NSMakeRange(0, input.lengthOfBytes(using: String.Encoding.utf8)))
        
        if (matches != nil) {
            return matches!.count > 0
        }else{
            return false
        }
    }
}

创建测试案例 EmailTester

import XCTest



final class EmailTester: XCTestCase {
    
    func testEmail() throws {
        let emailUtil = EmailUtil()
        let result = emailUtil.validateEmail(email: "s1@163.")
        XCTAssert(result,"邮箱格式不正确")
    }

}

会报错：Cannot find xxxx in scope ，改一下Target Membership

测试符合预期

修改邮箱

测试通过

使用XCTest框架进行性能测试

    func testPerformanceExample() throws {
        measure {
            for _ in 0...600 {
                let image = UIImage(named: "wind")
                print(image?.size)
            }
        }
    }