challenge.kt

package com.igorwojda.integer.countupanddown

import org.amshove.kluent.shouldBeEqualTo
import org.junit.jupiter.api.Test

private fun countUpAndDown(n: Int): List<Int> {
    TODO("not implemented")
}

private class Test {
    @Test
    fun `count up and down 0`() {
        countUpAndDown(0) shouldBeEqualTo listOf(0)
    }

    @Test
    fun `count up and down 1`() {
        countUpAndDown(1) shouldBeEqualTo listOf(0, 1, 0)
    }

    @Test
    fun `count up and down 2`() {
        countUpAndDown(2) shouldBeEqualTo listOf(0, 1, 2, 1, 0)
    }

    @Test
    fun `count up and down 3`() {
        countUpAndDown(3) shouldBeEqualTo listOf(0, 1, 2, 3, 2, 1, 0)
    }

    @Test
    fun `count up and down 4`() {
        countUpAndDown(4) shouldBeEqualTo listOf(0, 1, 2, 3, 4, 3, 2, 1, 0)
    }

    @Test
    fun `count up and down 9`() {
        countUpAndDown(9) shouldBeEqualTo listOf(
            0,
            1,
            2,
            3,
            4,
            5,
            6,
            7,
            8,
            9,
            8,
            7,
            6,
            5,
            4,
            3,
            2,
            1,
            0
        )
    }
}