Unit testing sample: 2. Test Method

ExamLogicTest.kt

package packagename

import org.junit.After
import org.junit.Assert.assertEquals
import org.junit.Before
import org.junit.Test

class ExamLogicTest {

    // region Stored Instance Properties

    private var examLogic = ExamLogic()

    // endregion

    // region TestCase Life-Cycle Methods

    @Before
    fun setUp() {
        reset()
    }

    @After
    fun tearDown() {
    }

    // endregion

    // region Test Methods

    // region scoreExam(point:)

    @Test
    fun scoreExam() {
        val testCases = listOf(
            Pair(-1, "変な値を送るな！"),
            Pair(0, "赤点です！"),
            Pair(29, "赤点です！"),
            Pair(30, "まあまあです！"),
            Pair(79, "まあまあです！"),
            Pair(80, "やるじゃん！"),
            Pair(99, "やるじゃん！"),
            Pair(100, "天才です！"),
            Pair(101, "変な値を送るな！")
        )

        for ((point, expected) in testCases) {
            reset()
            val actual = this.examLogic.scoreExam(point)
            assertEquals(actual, expected)
        }
    }

    // endregion

    // endregion

    // region Other Private Methods

    private fun reset() {
        this.examLogic = ExamLogic()
    }

    // endregion

}

ExamLogicTests.swift

import XCTest
@testable import TargetName

final class ExamLogicTests: XCTestCase {
    
    // MARK: Stored Instance Properties
    
    private var examLogic = ExamLogic()

    // MARK: TestCase Life-Cycle Methods

    override func setUp() {
        reset()
    }

    override func tearDown() {
    }
    
    // MARK: - Test Methods
    
    // MARK: scoreExam(point:)
    
    func test_scoreExam() {
        typealias TestCase = (point: Int, expected: String, line: UInt)
        let testCases: [TestCase] = [
            (-1, "変な値を送るな！", #line),
            (0, "赤点です！", #line),
            (29, "赤点です！", #line),
            (30, "まあまあです！", #line),
            (79, "まあまあです！", #line),
            (80, "やるじゃん！", #line),
            (99, "やるじゃん！", #line),
            (100, "天才です！", #line),
            (101, "変な値を送るな！", #line)
        ]
        
        for (point, expected, line) in testCases {
            reset()
            let actual = self.examLogic.scoreExam(point: point)
            XCTAssertEqual(actual, expected, line: line)
        }
    }

    // MARK: - Other Private Methods

    private func reset() {
        self.examLogic = ExamLogic()
    }
}

ref: https://twitter.com/the_uhooi/status/1261934636466241536?s=20

prev: Target method before refactoring
https://gist.github.com/uhooi/0aa127154bc0c14cba3887c42eee1d87

next: Target method after refactoring
https://gist.github.com/uhooi/b1f5404668022ad9ab10d39e0ee187d8