ZIO Test

import zio.test._
import zio.test.Assertion._
import zio.test.Gen._

// Property-based testing
import zio.test.{Gen, check, checkAll}

// Test aspects
import zio.test.TestAspect.{timeout, parallel, eventually}

// Test services
import zio.test.{TestClock, TestConsole, TestRandom, TestSystem}

// Advanced features
import zio.test.laws._      // Laws-based property testing
import zio.test.diff._      // Value differencing system
import zio.test.render._    // Test result rendering
import zio.test.poly._      // Polymorphic generators

import zio.test._
import zio.test.Assertion._

object BasicExampleSpec extends ZIOSpecDefault {
  def spec = suite("Basic Examples")(
    test("simple assertion") {
      val result = 2 + 2
      assertTrue(result == 4)
    },
    
    test("ZIO effect testing") {
      for {
        time <- zio.Clock.currentTime(java.util.concurrent.TimeUnit.MILLISECONDS)
      } yield assertTrue(time > 0L)
    },
    
    test("property-based testing") {
      check(Gen.int) { n =>
        assertTrue((n + n) == (n * 2))
      }
    }
  )
}

def test[R](label: String)(assertion: => ZIO[R, Any, TestResult]): Spec[R, Any]
def suite[R](label: String)(specs: Spec[R, Any]*): Spec[R, Any]

trait Spec[+R, +E] {
  def @@[R1 <: R](aspect: TestAspect[Nothing, R1, Nothing, Any]): Spec[R1, E]
}

type ZTest[-R, +E] = ZIO[R, TestFailure[E], TestSuccess]

// Base classes for test specifications
abstract class ZIOSpec[R] {
  def spec: Spec[R, Any]
}

abstract class ZIOSpecDefault extends ZIOSpec[TestEnvironment] {
  def spec: Spec[TestEnvironment, Any]
}

abstract class ZIOSpecAbstract[R](implicit trace: Trace) extends ZIOSpec[R] {
  def spec: Spec[R, Any]
}

def assertTrue(exprs: Boolean*): TestResult
def assert[A](expr: => A)(assertion: Assertion[A]): TestResult
def assertZIO[R, E, A](effect: ZIO[R, E, A])(assertion: Assertion[A]): ZIO[R, E, TestResult]

trait Assertion[-A] {
  def apply(value: A): TestResult
  def &&(that: Assertion[A]): Assertion[A]
  def ||(that: Assertion[A]): Assertion[A]
  def unary_! : Assertion[A]
}

// Core assertion functions
def equalTo[A](expected: A): Assertion[A]
def isTrue: Assertion[Boolean]
def contains[A](element: A): Assertion[Iterable[A]]
def hasSize[A](assertion: Assertion[Int]): Assertion[Iterable[A]]

def check[R <: ZAny, A](rv: Gen[R, A])(test: A => TestResult): ZIO[R with TestConfig, Nothing, TestResult]
def checkAll[R <: ZAny, A](rv: Gen[R, A])(test: A => TestResult): ZIO[R with TestConfig, Nothing, TestResult]

trait Gen[+R, +A] {
  def map[B](f: A => B): Gen[R, B]
  def flatMap[R1 <: R, B](f: A => Gen[R1, B]): Gen[R1, B]
  def filter(f: A => Boolean): Gen[R, A]
  def sample: ZStream[R, Nothing, Sample[R, A]]
}

// Generator constructors
val anyInt: Gen[Any, Int]
val anyString: Gen[Any, String]
def listOfN[R, A](n: Int)(g: Gen[R, A]): Gen[R, List[A]]
def oneOf[R, A](first: Gen[R, A], rest: Gen[R, A]*): Gen[R, A]

trait TestAspect[-LowerR, +UpperR, -LowerE, +UpperE] {
  def apply[R >: LowerR <: UpperR, E >: LowerE <: UpperE](
    spec: Spec[R, E]
  ): Spec[R, E]
}

// Common test aspects
object TestAspect {
  def timeout(duration: Duration): TestAspectAtLeastR[Live]
  val parallel: TestAspectPoly
  val sequential: TestAspectPoly
  val eventually: TestAspectAtLeastR[Live]
  val flaky: TestAspectPoly
  val ignore: TestAspectPoly
  val js: TestAspectPoly
  val jvm: TestAspectPoly
}

trait TestClock extends Clock {
  def adjust(duration: Duration): UIO[Unit]
  def setTime(duration: Duration): UIO[Unit]
  def timeZone: UIO[ZoneId]
}

trait TestConsole extends Console {
  def output: UIO[Vector[String]]
  def clearOutput: UIO[Unit]
  def feedLines(lines: String*): UIO[Unit]
}

trait TestRandom extends Random {
  def setSeed(seed: Long): UIO[Unit]
  def feedBooleans(booleans: Boolean*): UIO[Unit]
  def clearBooleans: UIO[Unit]
}

trait TestSystem extends System {
  def putEnv(name: String, value: String): UIO[Unit]
  def putProperty(name: String, value: String): UIO[Unit]
}

trait TestConfig {
  def repeats: Int
  def retries: Int
  def samples: Int
  def shrinks: Int
}

type TestEnvironment = Annotations with Live with Sized with TestConfig

object TestEnvironment {
  val live: ZLayer[Clock with Console with System with Random, Nothing, TestEnvironment]
}

val testEnvironment: ZLayer[Any, Nothing, TestEnvironment]

trait Laws[Caps, R] {
  def laws: List[ZLaws[Caps, R]]
}

trait ZLaws[-Caps, -R] {
  def run[R1 <: R, A](implicit
    checkConstructor: CheckConstructor[R1],
    caps: Caps,
    gen: GenF[R1, A]
  ): URIO[R1, TestResult]
}

object Laws {
  def derive[F[_], Caps, R](implicit
    laws: Laws[Caps, R]
  ): ZLaws[Caps, R]
}

trait Diff[A] {
  def apply(x: A, y: A): DiffResult
}

sealed trait DiffResult {
  def render: String
  def isIdentical: Boolean
}

object Diff {
  val string: Diff[String]
  val boolean: Diff[Boolean]
  val int: Diff[Int]
  def option[A](implicit diff: Diff[A]): Diff[Option[A]]
  def either[A, B](implicit diffA: Diff[A], diffB: Diff[B]): Diff[Either[A, B]]
}

trait TestRunner[R, E] {
  def run(spec: Spec[R, E]): ZIO[R, Nothing, Summary]
}

trait TestExecutor[R, E] {
  def run(spec: Spec[R, E], defExec: ExecutionStrategy): ZIO[R, Nothing, ExecutionResult[E]]
}

object TestRunner {
  def default[R, E]: TestRunner[R, E]
}

// Execution events
sealed trait ExecutionEvent
case class SuiteStarted(labels: List[String]) extends ExecutionEvent
case class SuiteCompleted(labels: List[String]) extends ExecutionEvent  
case class TestStarted(labels: List[String]) extends ExecutionEvent
case class TestCompleted(labels: List[String], result: TestResult) extends ExecutionEvent

// Test results and summaries
case class Summary(
  success: Int,
  fail: Int, 
  ignore: Int,
  failureDetails: String
) {
  def total: Int = success + fail + ignore
}

sealed trait ExecutionStrategy
object ExecutionStrategy {
  case object Sequential extends ExecutionStrategy
  case object Parallel extends ExecutionStrategy
}

// Core test types
trait TestResult {
  def isSuccess: Boolean
  def isFailure: Boolean
  def ??(message: String): TestResult
}

sealed trait TestFailure[+E] {
  def &&[E1 >: E](that: TestFailure[E1]): TestFailure[E1]
  def ||[E1 >: E](that: TestFailure[E1]): TestFailure[E1]
  def unary_! : TestFailure[E]
}

case class TestSuccess() extends AnyVal

// Diff system types
trait Diff[A] {
  def apply(x: A, y: A): DiffResult
}

sealed trait DiffResult {
  def render: String
}

// Test trace for debugging
case class TestTrace(
  rendered: String,
  span: Span
)

// Test structure types  
trait Spec[+R, +E]
case class SpecCase[+R, +E](
  label: String,
  test: ZIO[R, TestFailure[E], TestSuccess],
  annotations: TestAnnotationMap
)

// Sample and generation types
trait Sample[+R, +A] {
  def value: A
  def shrink: ZStream[R, Nothing, Sample[R, A]]
}

case class Sized(size: Int) extends AnyVal