<div id="readability-page-1" class="page"><div>
<p>link: <a href="https://kotest.io/">https://kotest.io</a></p>
<blockquote data-ke-style="style1"><p>Kotest is a flexible and elegant multi-platform test framework for Kotlin with extensive assertions and integrated property testing.</p>
</blockquote><h2>Testing Styles</h2>
<p>junit 스타일 지원, JS에서 많이 사용하는 jest와 유사한 테스트 스타일 지원, goovy로 작성하는 spock과도 유사한 형태의 behavior test 스타일도 각기 모두 지원한다.</p>
<h3>테스트 스타일 종류</h3>
<ul>
<li>Fun Spec(Scala)</li>
<li>Describe Spec(JavaScript framework)</li>
<li>Should Spec(kotest)</li>
<li>String Spec(kotest)</li>
<li>Behavior Spec(BDD)</li>
<li>Free Spec(Scala)</li>
<li>Word Spec(Scala)</li>
<li>Feature Spec(Cucumber)</li>
<li>Expect Spec(kotest)</li>
<li>Annotation Spec(Junit)</li>
</ul>
<pre><code>
class Calculator() {
    fun add(a: Int, b: Int) = a + b
    fun minus(a: Int, b: Int): Int {
        if (a &lt; 0 || b &lt; 0) {
            throw IllegalArgumentException()
        }
        return a - b
    }
}

class CalculatorAnnotationSpecTest : AnnotationSpec() {
    @Test
    fun `10 + 20 더하면, 30이 반환 되어야 한다`() {
        val calculator = Calculator()
        val result = calculator.add(10, 20)
        result shouldBe 30
    }
}

data class PythagTriple(val a: Int, val b: Int, val c: Int)

fun isPythagTriple(a: Int, b: Int, c: Int): Boolean = a * a + b * b == c * c
class MyTests : FunSpec({
    withData(
        PythagTriple(3, 4, 5),
        PythagTriple(6, 8, 10),
        PythagTriple(8, 15, 17),
        PythagTriple(7, 24, 25)
    ) { (a, b, c) -&gt;
        isPythagTriple(a, b, c) shouldBe true
    }
})

class CalculatorFunSpecTest : FunSpec({
    test("10 + 20 더하면, 30이 반환 되어야 한다.") {
        val calculator = Calculator()
        val result = calculator.add(10, 20)
        result shouldBe 30
    }

    context("a + b = sum Test") {
        val calculator = Calculator()
        table(
            headers("a", "b", "sum"),
            row(1, 2, 3),
            row(-1, 1, 0),
            row(0, 0, 0),
            row(100, 200, 300),
            row(-50, 25, -25)
        ).forAll { a, b, sum -&gt;
            test("$a + $b = $sum") {
                calculator.add(a,b) shouldBe sum
            }
        }
    }
})

class CalculatorTest : StringSpec({
    val calculator = Calculator()

    val testCases = table(
        headers("a", "b", "sum"),
        row(1, 2, 3),
        row(-1, 1, 0),
        row(0, 0, 0),
        row(100, 200, 300),
        row(-50, 25, -25)
    )

    forAll(testCases) { a, b, sum -&gt;
        "$a + $b = $sum" {
            calculator.add(a, b) shouldBe sum
        }
    }
})

class CalculatorStringSpecTest : StringSpec({
    "10 + 20 더하면, 30이 반환 되어야 한다." {
        val calculator = Calculator()
        val result = calculator.add(10, 20)
        result shouldBe 30
    }
})

class CalculatorShouldSpecTest : ShouldSpec({
    should("10 + 20 더하면, 30이 반환") {
        val calculator = Calculator()
        val result = calculator.add(10, 20)
        result shouldBe 30
    }
})

class CalculatorDescribeSpecTest : DescribeSpec({
    describe("calculator 테스트") {
        it("10 + 20 더하면, 30이 반환 되어야 한다.") {
            val calculator = Calculator()
            val result = calculator.add(10, 20)
            result shouldBe 30
        }

        it("10 + 30 더하면, 40이 반환 되어야 한다.") {
            val calculator = Calculator()
            val result = calculator.add(10, 30)
            result shouldBe 40
        }
    }
})

class CalculatorBehaviorSpecTest : BehaviorSpec({
    given("calculator 테스트") {
        `when`("10 + 20 더하면,") {
            then("30이 반환 되어야 한다.") {
                val calculator = Calculator()
                val result = calculator.add(10, 20)
                result shouldBe 30
            }
        }

        `when`("10 + 30 더하면,") {
            then("40이 반환 되어야 한다.") {
                val calculator = Calculator()
                val result = calculator.add(10, 30)
                result shouldBe 40
            }
            xthen("해당 구문은 실행하지 않는다.") {
                val calculator = Calculator()
                val result = calculator.add(10, 30)
                result shouldBe 40
            }
        }
    }
})
</code></pre>
<h3>Matcher</h3>
<h4>module</h4>
<ul>
<li>kotest-assertions-core<ul>
<li><a href="https://kotest.io/docs/assertions/core-matchers.html">https://kotest.io/docs/assertions/core-matchers.html</a></li>
</ul>
</li>
<li>kotest-assetions-json</li>
<li>kotest-assertions-kotlinx-time</li>
<li>kotest-assertions-sql</li>
<li>kotest-assertions-ktor</li>
</ul>
<h5>matcher - core</h5>
<ul>
<li>shouldBe</li>
<li>shouldBeTrue</li>
<li>shouldBeFalse</li>
<li>shouldThrow</li>
<li>shouldBeNull</li>
<li>shouldContain</li>
<li>shouldContainAll</li>
<li>shouldBeEmpty</li>
<li>etc...</li>
</ul>
<h2>intellij plugin</h2>
<p>플러그인을 설치 해주면, 실행이 매우 편리해진다. IDEA 내장으로 넣어줘요..</p>
<ul>
<li><a href="https://github.com/kotest/kotest-intellij-plugin">https://github.com/kotest/kotest-intellij-plugin</a></li>
</ul>
<h2>settings</h2>
<h3>test-framework</h3>
<pre><code>testImplementation 'io.kotest:kotest-runner-junit5:$version'

tasks.withType&lt;Test&gt;().configureEach {
   useJUnitPlatform()
}</code></pre><h3>data driven test (aka. parameterized test)</h3>
<p>ref. <a href="https://kotest.io/docs/framework/datatesting/data-driven-testing.html">https://kotest.io/docs/framework/datatesting/data-driven-testing.html</a></p>
<pre><code>testImplementation 'io.kotest:kotest-framework-datatest:5.5.5'</code></pre><pre><code>class MyTests : FunSpec({
  context("Pythag triples tests") {
    withData(
      PythagTriple(3, 4, 5),
      PythagTriple(6, 8, 10),
      PythagTriple(8, 15, 17),
      PythagTriple(7, 24, 25)
    ) { (a, b, c) -&gt;
      isPythagTriple(a, b, c) shouldBe true
    }
  }
})</code></pre><p>다양한 케이스를 좀 알아 보자.</p>
<pre><code>class Calculator() {
    fun add(a: Int, b: Int) = a + b
    fun minus(a: Int, b: Int): Int {
        if (a &lt; 0 || b &lt; 0) {
            throw IllegalArgumentException()
        }
        return a - b
    }
}</code></pre><p>위와 같은 클래스를 테스트 해본다.</p>
<pre><code>class CalculatorFunSpecTest : FunSpec({
    test("10 + 20 더하면, 30이 반환 되어야 한다.") {
        val calculator = Calculator()
        val result = calculator.add(10, 20)
        result shouldBe 30
    }

    context("a + b = sum Test") {
        val calculator = Calculator()
        table(
            headers("a", "b", "sum"),
            row(1, 2, 3),
            row(-1, 1, 0),
            row(0, 0, 0),
            row(100, 200, 300),
            row(-50, 25, -25)
        ).forAll { a, b, sum -&gt;
            test("$a + $b = $sum") {
                calculator.add(a,b) shouldBe sum
            }
        }
    }
})

class CalculatorTest : StringSpec({
    val calculator = Calculator()

    val testCases = table(
        headers("a", "b", "sum"),
        row(1, 2, 3),
        row(-1, 1, 0),
        row(0, 0, 0),
        row(100, 200, 300),
        row(-50, 25, -25)
    )

    forAll(testCases) { a, b, sum -&gt;
        "$a + $b = $sum" {
            calculator.add(a, b) shouldBe sum
        }
    }
})</code></pre><p>위와 같이 table 값을 input으로 받아 테스트 제목으로 출력 하는 것도 가능하다. junit을 대체 할 수 있어보인다.</p>
<h3>assertions library</h3>
<pre><code>testImplementation 'io.kotest:kotest-assertions-core:$version'</code></pre><h3>property testing</h3>
<pre><code>testImplementation 'io.kotest:kotest-property:$version'</code></pre><h3>spring kotest extension</h3>
<pre><code>testImplementation 'io.kotest.extensions:kotest-extensions-spring:$version'</code></pre><p>mocking의 경우에는 mokk를 사용하는 것이 좋다.</p>
<p><a href="https://mockk.io/">https://mockk.io/</a></p></div></div>

Seungdols Company

seungdols

kotest link: https://kotest.io Kotest is a flexible and elegant multi-platform test framework for Kotlin with extensive assertions and integrated property testing. Testing Styles junit 스타일 지원, JS에서 많이 사용하는 jest와 유사한 테스트 스타일 지원, goovy로 작성하는 spock과도 유사한 형..

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