libraries/stdlib/test/time/DurationUnitTest.kt

/*
 * Copyright 2010-2025 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package test.time

import kotlin.math.sign
import kotlin.test.*
import kotlin.time.*
import kotlin.time.DurationUnit.*

class DurationUnitTest {

    @Test
    @OptIn(ExperimentalTime::class)
    fun conversion() {
        fun test(sourceValue: Double, sourceUnit: DurationUnit, targetValue: Double, targetUnit: DurationUnit) {
            assertEquals(
                targetValue, Duration.convert(sourceValue, sourceUnit, targetUnit),
                "Expected $sourceValue $sourceUnit to be $targetValue $targetUnit"
            )
            assertEquals(
                sourceValue, Duration.convert(targetValue, targetUnit, sourceUnit),
                "Expected $targetValue $targetUnit to be $sourceValue $sourceUnit"
            )
        }
        test(1.0, MINUTES, 60.0, SECONDS)
        test(30.0, MINUTES, 0.5, HOURS)
        test(12.0, HOURS, 0.5, DAYS)
        test(720.0, MINUTES, 0.5, DAYS)
        test(1.0, DAYS, 86400.0, SECONDS)
        test(1.0, DAYS, 86400e9, NANOSECONDS)
        test(50.0, NANOSECONDS, 0.05, MICROSECONDS)
        test(50.0, NANOSECONDS, 50e-9, SECONDS)
        test(16.0, MILLISECONDS, 0.016, SECONDS)
    }

    @Test
    fun unitOrdering() {
        val units = listOf(NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS)
        for (i in units.indices) {
            for (j in units.indices) {
                assertEquals(
                    (i compareTo j).sign,
                    (units[i] compareTo units[j]).sign,
                    "Units ${units[i]} and ${units[j]} are not in the expected order"
                )
            }
        }
    }
}