fix(test): Unit Tests not DFUing items

src/main/kotlin/features/debug/ExportedTestConstantMeta.kt

@@ -0,0 +1,19 @@
+package moe.nea.firmament.features.debug
+
+import com.mojang.serialization.Codec
+import com.mojang.serialization.codecs.RecordCodecBuilder
+import java.util.Optional
+
+data class ExportedTestConstantMeta(
+	val dataVersion: Int,
+	val modVersion: Optional<String>,
+) {
+	companion object {
+		val CODEC: Codec<ExportedTestConstantMeta> = RecordCodecBuilder.create {
+			it.group(
+				Codec.INT.fieldOf("dataVersion").forGetter(ExportedTestConstantMeta::dataVersion),
+				Codec.STRING.optionalFieldOf("modVersion").forGetter(ExportedTestConstantMeta::modVersion),
+			).apply(it, ::ExportedTestConstantMeta)
+		}
+	}
+}