Testing data class serialization

Location.kt

import java.time.Instant

data class Location(@JsonProperty val userId: Int,
                    @JsonProperty val geohash: String,
                    @JsonProperty val createdAt: Instant,
                    @JsonProperty val updatedAt: Instant?)

LocationTest.kt

import com.fasterxml.jackson.annotation.JsonProperty
import io.dropwizard.testing.FixtureHelpers.fixture
import net.forumforall.kuorum.helpers.Json
import org.hamcrest.MatcherAssert.assertThat
import org.hamcrest.Matchers.`is`
import org.hamcrest.Matchers.equalTo
import org.junit.Test
import java.time.Instant

class LocationTest {
    /*
     * location.json:
     *
     * {
     *    "userId" : 7,
     *    "geohash" : "dnqnf41kf",
     *    "createdAt" : "2016-10-14T21:16:05Z",
     *    "updatedAt" : "2016-10-14T21:16:05Z"
     * }
     */
    val locationFixture = "fixtures/location.json"
    val time = Instant.ofEpochSecond(1476479765)
    val location = Location(7, "dnqnf41kf", time, time)

    @Test
    fun serializesToJson() {
        assertThat(Json.asJson(location), `is`(equalTo(fixture(locationFixture))))
    }

    @Test
    fun deserializeFromJson() {
        assertThat(Json.fromJson(fixture(locationFixture), Location::class.java), `is`(location))
    }
}