🕟 Get Emoji Clock Face given LocalTime (Kotlin)

EmojiClockExtension.kt

fun LocalTime.emojiClock(): String {
    return if (minute in 15..44) {
        // half-hour clock emoji
        when (hour % 12) {
            0 -> "\uD83D\uDD67" // 🕧
            1 -> "\uD83D\uDD5C" // 🕜
            2 -> "\uD83D\uDD5D" // 🕝
            3 -> "\uD83D\uDD5E" // 🕞
            4 -> "\uD83D\uDD5F" // 🕟
            5 -> "\uD83D\uDD60" // 🕠
            6 -> "\uD83D\uDD61" // 🕡
            7 -> "\uD83D\uDD62" // 🕢
            8 -> "\uD83D\uDD63" // 🕣
            9 -> "\uD83D\uDD64" // 🕤
            10 -> "\uD83D\uDD65" // 🕥
            11 -> "\uD83D\uDD66" // 🕦
            12 -> "\uD83D\uDD67" // 🕧
            else -> throw Exception("Invalid hour: ${hour % 12}")
        }
    } else { // minute in 45..14
        // hour o'clock emoji
        when (hour % 12) {
            0 -> "\uD83D\uDD5B" // 🕛
            1 -> "\uD83D\uDD50" // 🕐
            2 -> "\uD83D\uDD51" // 🕑
            3 -> "\uD83D\uDD52" // 🕒
            4 -> "\uD83D\uDD53" // 🕓
            5 -> "\uD83D\uDD54" // 🕔
            6 -> "\uD83D\uDD55" // 🕕
            7 -> "\uD83D\uDD56" // 🕖
            8 -> "\uD83D\uDD57" // 🕗
            9 -> "\uD83D\uDD58" // 🕘
            10 -> "\uD83D\uDD59" // 🕙
            11 -> "\uD83D\uDD5A" // 🕚
            12 -> "\uD83D\uDD5B" // 🕛
            else -> throw Exception("Invalid hour: ${hour % 12}")
        }
    }
}

EmojiClockUnitTest.kt

class EmojiClockUnitTest {

    @Test
    fun testEmojiClockFaceAt15() {
        // half-hour clock emoji
        assertEquals("🕧", LocalTime.of(0, 15).emojiClock())
        assertEquals("🕜", LocalTime.of(1, 15).emojiClock())
        assertEquals("🕝", LocalTime.of(2, 15).emojiClock())
        assertEquals("🕞", LocalTime.of(3, 15).emojiClock())
        assertEquals("🕟", LocalTime.of(4, 15).emojiClock())
        assertEquals("🕠", LocalTime.of(5, 15).emojiClock())
        assertEquals("🕡", LocalTime.of(6, 15).emojiClock())
        assertEquals("🕢", LocalTime.of(7, 15).emojiClock())
        assertEquals("🕣", LocalTime.of(8, 15).emojiClock())
        assertEquals("🕤", LocalTime.of(9, 15).emojiClock())
        assertEquals("🕥", LocalTime.of(10, 15).emojiClock())
        assertEquals("🕦", LocalTime.of(11, 15).emojiClock())
        assertEquals("🕧", LocalTime.of(12, 15).emojiClock())
        // repeat
        assertEquals("🕜", LocalTime.of(13, 15).emojiClock())
        assertEquals("🕝", LocalTime.of(14, 15).emojiClock())
        assertEquals("🕞", LocalTime.of(15, 15).emojiClock())
        assertEquals("🕟", LocalTime.of(16, 15).emojiClock())
        assertEquals("🕠", LocalTime.of(17, 15).emojiClock())
        assertEquals("🕡", LocalTime.of(18, 15).emojiClock())
        assertEquals("🕢", LocalTime.of(19, 15).emojiClock())
        assertEquals("🕣", LocalTime.of(20, 15).emojiClock())
        assertEquals("🕤", LocalTime.of(21, 15).emojiClock())
        assertEquals("🕥", LocalTime.of(22, 15).emojiClock())
        assertEquals("🕦", LocalTime.of(23, 15).emojiClock())
    }

    @Test
    fun testEmojiClockFaceAt30() {
        // half-hour clock emoji
        assertEquals("🕧", LocalTime.of(0, 30).emojiClock())
        assertEquals("🕜", LocalTime.of(1, 30).emojiClock())
        assertEquals("🕝", LocalTime.of(2, 30).emojiClock())
        assertEquals("🕞", LocalTime.of(3, 30).emojiClock())
        assertEquals("🕟", LocalTime.of(4, 30).emojiClock())
        assertEquals("🕠", LocalTime.of(5, 30).emojiClock())
        assertEquals("🕡", LocalTime.of(6, 30).emojiClock())
        assertEquals("🕢", LocalTime.of(7, 30).emojiClock())
        assertEquals("🕣", LocalTime.of(8, 30).emojiClock())
        assertEquals("🕤", LocalTime.of(9, 30).emojiClock())
        assertEquals("🕥", LocalTime.of(10, 30).emojiClock())
        assertEquals("🕦", LocalTime.of(11, 30).emojiClock())
        assertEquals("🕧", LocalTime.of(12, 30).emojiClock())
        // repeat
        assertEquals("🕜", LocalTime.of(13, 30).emojiClock())
        assertEquals("🕝", LocalTime.of(14, 30).emojiClock())
        assertEquals("🕞", LocalTime.of(15, 30).emojiClock())
        assertEquals("🕟", LocalTime.of(16, 30).emojiClock())
        assertEquals("🕠", LocalTime.of(17, 30).emojiClock())
        assertEquals("🕡", LocalTime.of(18, 30).emojiClock())
        assertEquals("🕢", LocalTime.of(19, 30).emojiClock())
        assertEquals("🕣", LocalTime.of(20, 30).emojiClock())
        assertEquals("🕤", LocalTime.of(21, 30).emojiClock())
        assertEquals("🕥", LocalTime.of(22, 30).emojiClock())
        assertEquals("🕦", LocalTime.of(23, 30).emojiClock())
    }

    @Test
    fun testEmojiClockFaceAt45() {
        // hour o'clock emoji
        assertEquals("🕛", LocalTime.of(0, 45).emojiClock())
        assertEquals("🕐", LocalTime.of(1, 45).emojiClock())
        assertEquals("🕑", LocalTime.of(2, 45).emojiClock())
        assertEquals("🕒", LocalTime.of(3, 45).emojiClock())
        assertEquals("🕓", LocalTime.of(4, 45).emojiClock())
        assertEquals("🕔", LocalTime.of(5, 45).emojiClock())
        assertEquals("🕕", LocalTime.of(6, 45).emojiClock())
        assertEquals("🕖", LocalTime.of(7, 45).emojiClock())
        assertEquals("🕗", LocalTime.of(8, 45).emojiClock())
        assertEquals("🕘", LocalTime.of(9, 45).emojiClock())
        assertEquals("🕙", LocalTime.of(10, 45).emojiClock())
        assertEquals("🕚", LocalTime.of(11, 45).emojiClock())
        assertEquals("🕛", LocalTime.of(12, 45).emojiClock())
        // repeat
        assertEquals("🕐", LocalTime.of(13, 45).emojiClock())
        assertEquals("🕑", LocalTime.of(14, 45).emojiClock())
        assertEquals("🕒", LocalTime.of(15, 45).emojiClock())
        assertEquals("🕓", LocalTime.of(16, 45).emojiClock())
        assertEquals("🕔", LocalTime.of(17, 45).emojiClock())
        assertEquals("🕕", LocalTime.of(18, 45).emojiClock())
        assertEquals("🕖", LocalTime.of(19, 45).emojiClock())
        assertEquals("🕗", LocalTime.of(20, 45).emojiClock())
        assertEquals("🕘", LocalTime.of(21, 45).emojiClock())
        assertEquals("🕙", LocalTime.of(22, 45).emojiClock())
        assertEquals("🕚", LocalTime.of(23, 45).emojiClock())
    }

    @Test
    fun testEmojiClockFaceAt0() {
        // hour o'clock emoji
        assertEquals("🕛", LocalTime.of(0, 0).emojiClock())
        assertEquals("🕐", LocalTime.of(1, 0).emojiClock())
        assertEquals("🕑", LocalTime.of(2, 0).emojiClock())
        assertEquals("🕒", LocalTime.of(3, 0).emojiClock())
        assertEquals("🕓", LocalTime.of(4, 0).emojiClock())
        assertEquals("🕔", LocalTime.of(5, 0).emojiClock())
        assertEquals("🕕", LocalTime.of(6, 0).emojiClock())
        assertEquals("🕖", LocalTime.of(7, 0).emojiClock())
        assertEquals("🕗", LocalTime.of(8, 0).emojiClock())
        assertEquals("🕘", LocalTime.of(9, 0).emojiClock())
        assertEquals("🕙", LocalTime.of(10, 0).emojiClock())
        assertEquals("🕚", LocalTime.of(11, 0).emojiClock())
        assertEquals("🕛", LocalTime.of(12, 0).emojiClock())
        // repeat
        assertEquals("🕐", LocalTime.of(13, 0).emojiClock())
        assertEquals("🕑", LocalTime.of(14, 0).emojiClock())
        assertEquals("🕒", LocalTime.of(15, 0).emojiClock())
        assertEquals("🕓", LocalTime.of(16, 0).emojiClock())
        assertEquals("🕔", LocalTime.of(17, 0).emojiClock())
        assertEquals("🕕", LocalTime.of(18, 0).emojiClock())
        assertEquals("🕖", LocalTime.of(19, 0).emojiClock())
        assertEquals("🕗", LocalTime.of(20, 0).emojiClock())
        assertEquals("🕘", LocalTime.of(21, 0).emojiClock())
        assertEquals("🕙", LocalTime.of(22, 0).emojiClock())
        assertEquals("🕚", LocalTime.of(23, 0).emojiClock())
    }
}