diff --git a/modules/events-server/src/test/kotlin/dev/adamko/kafkatorio/processor/misc/KxsBinaryTests.kt b/modules/events-server/src/test/kotlin/dev/adamko/kafkatorio/processor/misc/KxsBinaryTests.kt
new file mode 100644
index 0000000..bd4489e
--- /dev/null
+++ b/modules/events-server/src/test/kotlin/dev/adamko/kafkatorio/processor/misc/KxsBinaryTests.kt
@@ -0,0 +1,76 @@
+package dev.adamko.kafkatorio.processor.misc
+
+import dev.adamko.kafkatorio.events.schema.MapChunkPosition
+import dev.adamko.kafkatorio.events.schema.SurfaceIndex
+import dev.adamko.kafkatorio.processor.serdes.kxsBinary
+import dev.adamko.kafkatorio.processor.topology.ChunkSize
+import dev.adamko.kafkatorio.processor.topology.FactorioServerId
+import dev.adamko.kafkatorio.processor.topology.ServerMapChunkId
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.equality.shouldBeEqualToComparingFields
+import io.kotest.matchers.shouldBe
+import kotlinx.serialization.decodeFromByteArray
+import kotlinx.serialization.encodeToByteArray
+
+
+class KxsBinaryTests : FunSpec({
+
+  test("byte array") {
+    val ba = byteArrayOf(
+      0, 4, 116, 101, 115, 116, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 3
+    )
+
+    val result = kxsBinary.decodeFromByteArray(ServerMapChunkId.serializer(), ba)
+
+    withClue(ba.toString(Charsets.UTF_8)) {
+
+      result shouldBeEqualToComparingFields ServerMapChunkId(
+        serverId = FactorioServerId("test"),
+        chunkPosition = MapChunkPosition(1, 2),
+        surfaceIndex = SurfaceIndex(1u),
+        chunkSize = ChunkSize.CHUNK_064,
+      )
+
+    }
+  }
+
+  test("encoding") {
+    val ba = kxsBinary.encodeToByteArray(
+      ServerMapChunkId(
+        serverId = FactorioServerId("test"),
+        chunkPosition = MapChunkPosition(1, 2),
+        surfaceIndex = SurfaceIndex(1u),
+        chunkSize = ChunkSize.CHUNK_064,
+      )
+    )
+
+    withClue(ba.toString(Charsets.UTF_8)) {
+      ba shouldBe byteArrayOf(
+        0, 4, 116, 101, 115, 116, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 3
+      )
+    }
+  }
+
+  context("inline value class") {
+    val uuid = "fa858d73-6205-44cf-aeeb-6bbf3148c4a7"
+    //@formatter:off
+    val expectedBytes = byteArrayOf(0, 36, 102, 97, 56, 53, 56, 100, 55, 51, 45, 54, 50, 48, 53, 45, 52, 52, 99, 102, 45, 97, 101, 101, 98, 45, 54, 98, 98, 102, 51, 49, 52, 56, 99, 52, 97, 55)
+    //@formatter:on
+
+    test("encode") {
+      val ba = kxsBinary.encodeToByteArray(FactorioServerId(uuid))
+
+      withClue(ba.toString(Charsets.UTF_8)) {
+        ba shouldBe expectedBytes
+      }
+    }
+    test("decode") {
+      val ba = kxsBinary.encodeToByteArray(FactorioServerId(uuid))
+      val id: FactorioServerId = kxsBinary.decodeFromByteArray(ba)
+
+      id shouldBeEqualToComparingFields FactorioServerId(uuid)
+    }
+  }
+
+})