implement tests

also fix MD5

gradle/libs.versions.toml

@@ -7,3 +7,4 @@ multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotl
 
 [libraries]
 bytearray = { module = "com.infendro:bytearray", version.ref = "bytearray" }
+test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }