diff --git a/src/commonTest/kotlin/BinaryIdTest.kt b/src/commonTest/kotlin/BinaryIdTest.kt
index ac8cd42..f6ec93a 100644
--- a/src/commonTest/kotlin/BinaryIdTest.kt
+++ b/src/commonTest/kotlin/BinaryIdTest.kt
@@ -1,5 +1,11 @@
+import kotlinx.coroutines.test.runTest
+import net.sergeych.bintools.toDump
+import net.sergeych.bipack.BipackEncoder
 import net.sergeych.crypto2.BinaryId
+import net.sergeych.crypto2.ByteChunk
+import net.sergeych.crypto2.initCrypto
 import kotlin.test.Test
+import kotlin.test.assertContentEquals
 import kotlin.test.assertEquals
 
 class BinaryIdTest {
@@ -13,4 +19,16 @@ class BinaryIdTest {
         assertEquals(4, a.id.size)
 
     }
+
+    @Test
+    fun testByteChunkSizes() = runTest {
+        initCrypto()
+        val x = ByteChunk.random(3)
+        assertEquals(3, x.data.size)
+        assertEquals(3, x.toByteArray().size)
+        assertEquals(3, x.toUByteArray().size)
+        println(BipackEncoder.encode(x).toDump())
+        assertEquals(4, BipackEncoder.encode(x).size)
+        assertContentEquals(BipackEncoder.encode(x.toByteArray()), BipackEncoder.encode(x))
+    }
 }
\ No newline at end of file