diff --git a/src/main/kotlin/de/gmuth/ipp/core/IppInputStream.kt b/src/main/kotlin/de/gmuth/ipp/core/IppInputStream.kt
index f9932e2d..031ea2c5 100644
--- a/src/main/kotlin/de/gmuth/ipp/core/IppInputStream.kt
+++ b/src/main/kotlin/de/gmuth/ipp/core/IppInputStream.kt
@@ -55,14 +55,14 @@ class IppInputStream(inputStream: BufferedInputStream) : DataInputStream(inputSt
                     }
                 }
             } while (tag != End)
-        } catch (exception: Exception) {
-            readBytes().apply {
+        } catch (throwable: Throwable) {
+            if (throwable !is EOFException) readBytes().apply {
                 if (isNotEmpty()) {
                     log.warning { "skipped $size unparsed bytes" }
                     hexdump { log.warning { it } }
                 }
             }
-            throw exception
+            throw throwable
         }
     }
 
@@ -75,9 +75,8 @@ class IppInputStream(inputStream: BufferedInputStream) : DataInputStream(inputSt
         val name = readString()
         val value = try {
             readAttributeValue(tag)
-        } catch (exception: Exception) {
-            if (exception !is EOFException) readBytes().hexdump { log.info { it } }
-            throw IppException("failed to read attribute value of '$name' ($tag)", exception)
+        } catch (throwable: Throwable) {
+            throw IppException("failed to read attribute value of '$name' ($tag)", throwable)
         }
         // remember attributes-charset for name and text value decoding
         if (name == "attributes-charset") attributesCharset = value as Charset
diff --git a/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt b/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt
index 02af9d37..4963983b 100644
--- a/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt
+++ b/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt
@@ -88,9 +88,6 @@ abstract class IppMessage() {
             toByteArray()
         }
 
-    fun encodeAsInputStream() =
-        ByteArrayInputStream(encode())
-
     // --------
     // DECODING
     // --------
diff --git a/src/main/kotlin/de/gmuth/ipp/core/IppTag.kt b/src/main/kotlin/de/gmuth/ipp/core/IppTag.kt
index 148da212..5a44eaf5 100644
--- a/src/main/kotlin/de/gmuth/ipp/core/IppTag.kt
+++ b/src/main/kotlin/de/gmuth/ipp/core/IppTag.kt
@@ -4,7 +4,7 @@ package de.gmuth.ipp.core
  * Copyright (c) 2020 Gerhard Muth
  */
 
-// [RFC 8010] and [RFC 3380]
+// [RFC 8010] and [RFC 3380]
 enum class IppTag(
     val code: Byte,
     val registeredName: String,
diff --git a/src/test/kotlin/de/gmuth/ipp/core/IppAttributesGroupTests.kt b/src/test/kotlin/de/gmuth/ipp/core/IppAttributesGroupTests.kt
index ca74eda1..813aa0e7 100644
--- a/src/test/kotlin/de/gmuth/ipp/core/IppAttributesGroupTests.kt
+++ b/src/test/kotlin/de/gmuth/ipp/core/IppAttributesGroupTests.kt
@@ -72,6 +72,12 @@ class IppAttributesGroupTests {
         assertEquals("bar", group.getValue("foo") as String)
     }
 
+    @Test
+    fun getTextValue() {
+        group.attribute("foo", TextWithoutLanguage, "bar".toIppString())
+        assertEquals("bar", group.getTextValue("foo"))
+    }
+
     @Test
     fun getValueOrNull() {
         group.attribute("foo0", Keyword, "bar0")
diff --git a/src/test/kotlin/de/gmuth/ipp/core/IppInputStreamTests.kt b/src/test/kotlin/de/gmuth/ipp/core/IppInputStreamTests.kt
index 0a9c1314..d43334d5 100644
--- a/src/test/kotlin/de/gmuth/ipp/core/IppInputStreamTests.kt
+++ b/src/test/kotlin/de/gmuth/ipp/core/IppInputStreamTests.kt
@@ -5,6 +5,7 @@ package de.gmuth.ipp.core
  */
 
 import de.gmuth.ipp.core.IppResolution.Unit.DPI
+import de.gmuth.log.Logging
 import java.io.ByteArrayInputStream
 import java.net.URI
 import java.util.logging.Logger
@@ -15,6 +16,10 @@ import kotlin.test.assertTrue
 
 class IppInputStreamTest {
 
+    init {
+        Logging.configure()
+    }
+
     private val message = object : IppMessage() {
         override val codeDescription: String
             get() = "codeDescription"
@@ -181,6 +186,14 @@ class IppInputStreamTest {
         }
     }
 
+    @Test
+    fun readMessageFails() {
+        val encoded = "01 01 00 0B 00 00 00 08 01 47 00 01 61 00 01 66 0A 0B 0C 0D"
+       assertFailsWith<IppException> {
+            encoded.toIppInputStream().readMessage(message)
+       }
+    }
+
     @Test
     fun readMessageReadAttributeFails() {
         val encoded = "00 03 66 6F 6F 00 03 62 61 72"
diff --git a/src/test/kotlin/de/gmuth/ipp/core/IppRequestTests.kt b/src/test/kotlin/de/gmuth/ipp/core/IppRequestTests.kt
index d442597c..cbefb69f 100644
--- a/src/test/kotlin/de/gmuth/ipp/core/IppRequestTests.kt
+++ b/src/test/kotlin/de/gmuth/ipp/core/IppRequestTests.kt
@@ -4,7 +4,9 @@ package de.gmuth.ipp.core
  * Copyright (c) 2020-2023 Gerhard Muth
  */
 
+import de.gmuth.ipp.core.IppOperation.CreateJobSubscriptions
 import java.net.URI
+import java.time.Duration
 import java.util.logging.Logger.getLogger
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -65,9 +67,27 @@ class IppRequestTests {
             assertEquals(URI.create("ipp://printer"), getValue("printer-uri"))
             assertEquals(0, getValue("job-id"))
             assertEquals(listOf("one", "two"), getValues("requested-attributes"))
-            assertEquals("user".toIppString(), getValue("requesting-user-name"))
+            //assertEquals("user".toIppString(), getValue("requesting-user-name"))
         }
+        assertEquals("user", requestDecoded.requestingUserName)
         assertEquals("pdl-content", String(requestDecoded.documentInputStream!!.readBytes()))
     }
 
+    @Test
+    fun createSubscriptionAttributesGroup() {
+        IppRequest(CreateJobSubscriptions, URI.create("ipp://foo"))
+            .createSubscriptionAttributesGroup(
+                listOf("all"),
+                Duration.ofHours(1),
+                Duration.ofMinutes(1),
+                999
+            )
+    }
+
+    @Test
+    fun createSubscriptionAttributesGroupWithNullDefaults() {
+        IppRequest(CreateJobSubscriptions, URI.create("ipp://null"))
+            .createSubscriptionAttributesGroup()
+    }
+
 }
\ No newline at end of file
diff --git a/src/test/kotlin/de/gmuth/ipp/core/IppResponseTests.kt b/src/test/kotlin/de/gmuth/ipp/core/IppResponseTests.kt
index 6b09b666..ea0e79e4 100644
--- a/src/test/kotlin/de/gmuth/ipp/core/IppResponseTests.kt
+++ b/src/test/kotlin/de/gmuth/ipp/core/IppResponseTests.kt
@@ -63,4 +63,11 @@ class IppResponseTests {
         }
     }
 
+    @Test
+    fun createReponse() {
+        IppResponse(IppStatus.SuccessfulOk).run {
+            assertTrue(isSuccessful())
+        }
+    }
+
 }
\ No newline at end of file