Kotlin extensions for json based assertions

jsonAssertions.kt

// Example: jsonExpected shouldEqualJson jsonGiven


import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.databind.SerializationFeature
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
import com.fasterxml.jackson.module.kotlin.readValue
import org.amshove.kluent.shouldEqual

fun simpleJsonSerializer(): ObjectMapper {
    return jacksonObjectMapper()
            .registerModules(
                    JavaTimeModule(),
                    Jdk8Module()
            )
            .disable(
                    SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,
                    SerializationFeature.WRITE_DURATIONS_AS_TIMESTAMPS,
                    SerializationFeature.WRITE_DURATIONS_AS_TIMESTAMPS,
                    SerializationFeature.WRITE_ENUMS_USING_INDEX
            )
}

fun String.toNormalizedJson(): String {
    val mapper = jacksonObjectMapper()
    mapper.configure(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS, true);
    val decoded:Any? = mapper.readValue(this)// mapper.readTree(this)

    return mapper
            .writeValueAsString(decoded)
            .trim()
}

infix fun String.shouldEqualJson(theOther: String) =
        this.toNormalizedJson() shouldEqual theOther.toNormalizedJson()

fun Any?.toJson(mapper: ObjectMapper = simpleJsonSerializer()): String {
    return mapper.writeValueAsString(this)
}