diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index 9fc954c..5e0fd7d 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -4262,23 +4262,32 @@
 " Tests for the str2blob() function
 func Test_str2blob()
   let lines =<< trim END
-    call assert_equal(0z, str2blob(""))
-    call assert_fails("call str2blob([])", 'E1174: String required for argument 1')
-    call assert_equal(0z6162, str2blob("ab"))
-    call assert_equal(0zC2ABC2BB, str2blob("«»"))
-    call assert_equal(0zC59DC59F, str2blob("ŝş"))
-    call assert_equal(0zE0AE85E0.AE87, str2blob("அஇ"))
-    call assert_equal(0zF09F81B0.F09F81B3, str2blob("🁰🁳"))
-    call assert_equal(0z616263, str2blob('abc', {}))
-    call assert_equal(0zABBB, str2blob('«»', {'encoding': 'latin1'}))
-    call assert_equal(0zC2ABC2BB, str2blob('«»', {'encoding': 'utf8'}))
+    call assert_equal(0z, str2blob([""]))
+    call assert_equal(0z, str2blob([]))
+    call assert_equal(0z, str2blob(test_null_list()))
+    call assert_equal(0z, str2blob([test_null_string(), test_null_string()]))
+    call assert_fails("call str2blob('')", 'E1211: List required for argument 1')
+    call assert_equal(0z61, str2blob(["a"]))
+    call assert_equal(0z6162, str2blob(["ab"]))
+    call assert_equal(0z610062, str2blob(["a\nb"]))
+    call assert_equal(0z61620A6364, str2blob(["ab", "cd"]))
+    call assert_equal(0z0A, str2blob(["", ""]))
 
-    call assert_fails("call str2blob('abc', [])", 'E1206: Dictionary required for argument 2')
-    call assert_fails("call str2blob('abc', {'encoding': []})", 'E730: Using a List as a String')
-    call assert_fails("call str2blob('abc', {'encoding': 'ab12xy'})", 'E1515: Unable to convert to ''ab12xy'' encoding')
-    call assert_fails("call str2blob('ŝş', {'encoding': 'latin1'})", 'E1515: Unable to convert to ''latin1'' encoding')
-    call assert_fails("call str2blob('அஇ', {'encoding': 'latin1'})", 'E1515: Unable to convert to ''latin1'' encoding')
-    call assert_fails("call str2blob('🁰🁳', {'encoding': 'latin1'})", 'E1515: Unable to convert to ''latin1'' encoding')
+    call assert_equal(0zC2ABC2BB, str2blob(["«»"]))
+    call assert_equal(0zC59DC59F, str2blob(["ŝş"]))
+    call assert_equal(0zE0AE85E0.AE87, str2blob(["அஇ"]))
+    call assert_equal(0zF09F81B0.F09F81B3, str2blob(["🁰🁳"]))
+    call assert_equal(0z616263, str2blob(['abc'], {}))
+    call assert_equal(0zABBB, str2blob(['«»'], {'encoding': 'latin1'}))
+    call assert_equal(0zABBB0AABBB, str2blob(['«»', '«»'], {'encoding': 'latin1'}))
+    call assert_equal(0zC2ABC2BB, str2blob(['«»'], {'encoding': 'utf8'}))
+
+    call assert_fails("call str2blob(['abc'], [])", 'E1206: Dictionary required for argument 2')
+    call assert_fails("call str2blob(['abc'], {'encoding': []})", 'E730: Using a List as a String')
+    call assert_fails("call str2blob(['abc'], {'encoding': 'ab12xy'})", 'E1515: Unable to convert to ''ab12xy'' encoding')
+    call assert_fails("call str2blob(['ŝş'], {'encoding': 'latin1'})", 'E1515: Unable to convert to ''latin1'' encoding')
+    call assert_fails("call str2blob(['அஇ'], {'encoding': 'latin1'})", 'E1515: Unable to convert to ''latin1'' encoding')
+    call assert_fails("call str2blob(['🁰🁳'], {'encoding': 'latin1'})", 'E1515: Unable to convert to ''latin1'' encoding')
   END
   call v9.CheckLegacyAndVim9Success(lines)
 endfunc
@@ -4286,18 +4295,23 @@
 " Tests for the blob2str() function
 func Test_blob2str()
   let lines =<< trim END
-    call assert_equal("", blob2str(0z))
+    call assert_equal([], blob2str(0z))
+    call assert_equal([], blob2str(test_null_blob()))
     call assert_fails("call blob2str([])", 'E1238: Blob required for argument 1')
-    call assert_equal("ab", blob2str(0z6162))
-    call assert_equal("«»", blob2str(0zC2ABC2BB))
-    call assert_equal("ŝş", blob2str(0zC59DC59F))
-    call assert_equal("அஇ", blob2str(0zE0AE85E0.AE87))
-    call assert_equal("🁰🁳", blob2str(0zF09F81B0.F09F81B3))
-    call assert_equal('«»', blob2str(0zABBB, {'encoding': 'latin1'}))
-    call assert_equal('«»', blob2str(0zC2ABC2BB, {'encoding': 'utf8'}))
+    call assert_equal(["ab"], blob2str(0z6162))
+    call assert_equal(["a\nb"], blob2str(0z610062))
+    call assert_equal(["ab", "cd"], blob2str(0z61620A6364))
+
+    call assert_equal(["«»"], blob2str(0zC2ABC2BB))
+    call assert_equal(["ŝş"], blob2str(0zC59DC59F))
+    call assert_equal(["அஇ"], blob2str(0zE0AE85E0.AE87))
+    call assert_equal(["🁰🁳"], blob2str(0zF09F81B0.F09F81B3))
+    call assert_equal(['«»'], blob2str(0zABBB, {'encoding': 'latin1'}))
+    call assert_equal(['«»'], blob2str(0zC2ABC2BB, {'encoding': 'utf8'}))
 
     #" Invalid encoding
     call assert_fails("call blob2str(0z80)", "E1515: Unable to convert from 'utf-8' encoding")
+    call assert_fails("call blob2str(0z610A80)", "E1515: Unable to convert from 'utf-8' encoding")
     call assert_fails("call blob2str(0zC0)", "E1515: Unable to convert from 'utf-8' encoding")
     call assert_fails("call blob2str(0zE0)", "E1515: Unable to convert from 'utf-8' encoding")
     call assert_fails("call blob2str(0zF0)", "E1515: Unable to convert from 'utf-8' encoding")