Split test for tagged and tagless format. Fix flush in tagless format.

dataforge-io/src/commonMain/kotlin/hep/dataforge/io/TaglessEnvelopeFormat.kt

@@ -43,6 +43,7 @@ class TaglessEnvelopeFormat(
             writeText(dataStart + "\r\n")
             writeFully(data.toBytes())
         }
+        flush()
     }
 
     override fun Input.readObject(): Envelope {

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

@@ -21,11 +21,34 @@ class FileEnvelopeTest {
     }
 
     @Test
-    fun testFileWriteRead() {
+    fun testFileWriteTagged() {
+        val tmpPath = Files.createTempFile("dataforge_test", ".df")
+        Global.io.writeEnvelopeFile(tmpPath, envelope)
+        assertTrue { tmpPath.toFile().length() > 0 }
+    }
+
+    @Test
+    fun testFileWriteReadTagged() {
         val tmpPath = Files.createTempFile("dataforge_test", ".df")
         Global.io.writeEnvelopeFile(tmpPath,envelope)
         println(tmpPath.toUri())
         val restored: Envelope = Global.io.readEnvelopeFile(tmpPath)
         assertTrue { envelope.contentEquals(restored) }
     }
+
+    @Test
+    fun testFileWriteTagless() {
+        val tmpPath = Files.createTempFile("dataforge_test", ".df")
+        Global.io.writeEnvelopeFile(tmpPath, envelope, formatFactory = TaglessEnvelopeFormat)
+        assertTrue { tmpPath.toFile().length() > 0 }
+    }
+
+    @Test
+    fun testFileWriteReadTagless() {
+        val tmpPath = Files.createTempFile("dataforge_test", ".df")
+        Global.io.writeEnvelopeFile(tmpPath, envelope, formatFactory = TaglessEnvelopeFormat)
+        println(tmpPath.toUri())
+        val restored: Envelope = Global.io.readEnvelopeFile(tmpPath, formatFactory = TaglessEnvelopeFormat)
+        assertTrue { envelope.contentEquals(restored) }
+    }
 }