매처

매처란 무엇인가요?

매처 혼합하기

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class DemoSpec extends AnyFlatSpec with Matchers {
  "A value" should "equal itself" in {
    val x = 3
    x shouldBe 3
  }
}

동등성 매처

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class EqSpec extends AnyFlatSpec with Matchers {
  "sum" should "be correct" in {
    (2 + 2) shouldBe 4
    (2 + 2) should equal (4)
  }
}

비교 매처

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class CmpSpec extends AnyFlatSpec with Matchers {
  "a number" should "compare" in {
    7 should be > 3
    7 should be <= 7
    2.0 shouldBe 2.0 +- 0.01
  }
}

문자열 매처

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class StrSpec extends AnyFlatSpec with Matchers {
  "a string" should "match parts" in {
    "hello world" should startWith ("hello")
    "hello world" should include ("o w")
    "hello world" should endWith ("world")
  }
}

컬렉션 매처

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class ColSpec extends AnyFlatSpec with Matchers {
  "a list" should "have expected contents" in {
    List(1, 2, 3) should have size 3
    List(1, 2, 3) should contain (2)
    List.empty[Int] shouldBe empty
  }
}

불리언 및 Option 매처

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class OptSpec extends AnyFlatSpec with Matchers {
  "an option" should "be inspected" in {
    Some(5) shouldBe defined
    Some(5) should contain (5)
    None shouldBe empty
  }
}

매처 결합하기

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class CombineSpec extends AnyFlatSpec with Matchers {
  "a number" should "satisfy both" in {
    7 should (be > 0 and be < 10)
  }
}

예외 테스트하기

import org.scalatest.flatspec.AnyFlatSpec
import org.scalatest.matchers.should.Matchers

class ExSpec extends AnyFlatSpec with Matchers {
  "dividing by zero" should "throw" in {
    an [ArithmeticException] should be thrownBy (1 / 0)
  }
}

매처가 유용한 이유

shouldBe와 should equal

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