jackson set kotlin enum class as camelCase

1. TeaType.kt

enum class TeaType {
    GREEN_TEA, HERBAL_TEA
    ;

    fun String.snakeToLowerCamelCase(): String {
        val snakeRegex = "_[a-zA-Z]".toRegex()
        return snakeRegex.replace(this.lowercase()) {
            it.value.replace("_","")
                .uppercase()
        }
    }

    @JsonValue
    fun jsonValue(): String {
        return name.snakeToLowerCamelCase()
    }
}

2. JacksonEnumTest.kt

@Test
fun `test jackson enum class`() {
    // given
    val objectMapper = ObjectMapper()

    class Order(
        val teaType: TeaType,
        val price: Int,
    )

    val order = Order(TeaType.GREEN_TEA, 3_000)

    // when
    val orderJsonString = objectMapper.writeValueAsString(order)

    // then
    assertThat(orderJsonString).isEqualTo("""
        {"teaType":"greenTea","price":3000}
    """.trimIndent())
}