Test IO operations with enveloop.

Failed reading file with `readAvaible` (testDataReading)

dataforge-io/src/jvmTest/kotlin/hep/dataforge/io/BinaryTest.kt

@@ -1,10 +1,12 @@
 package hep.dataforge.io
 
 import hep.dataforge.context.Global
+import kotlinx.io.core.readAvailable
 import org.junit.Test
 import java.nio.file.Files
 import java.nio.file.Paths
 import kotlin.test.assertEquals
+import kotlin.test.assertTrue
 
 class BinaryTest {
     val envelope = Envelope {
@@ -55,4 +57,26 @@ class BinaryTest {
         assertEquals(binary.size.toInt(), binary.toBytes().size)
     }
 
+    @Test
+    fun testDataReading() {
+        println(System.getProperty("user.dir"))
+        val tmpPath = Files.createTempFile("dataforge_test", ".df")
+        Global.io.writeEnvelopeFile(tmpPath, envelopeFromFile)
+
+        val binary = Global.io.readEnvelopeFile(tmpPath).data!!
+
+        var sum = 0.0
+        binary.read {
+            val dst = DoubleArray(100) { 0.0 }
+            do {
+                val flag = readAvailable(dst)
+                println("$flag : ${dst[0]}")
+                dst.map {
+                    sum += it
+                }
+            } while (flag != -1)
+        }
+        assertTrue(sum > 0.0)
+    }
+
 }