should be it

external/duckdb/test/sql/function/blob/encode.test

@@ -0,0 +1,41 @@
+# name: test/sql/function/blob/encode.test
+# description: Test blob encode/decode functions
+# group: [blob]
+
+statement ok
+PRAGMA enable_verification
+
+# test basic encode/decode usage
+query I
+SELECT encode('ü')
+----
+\xC3\xBC
+
+query I
+SELECT decode(encode('ü'))
+----
+ü
+
+query I
+SELECT decode('\xF0\x9F\xA6\x86'::BLOB)
+----
+🦆
+
+# null byte
+query I
+SELECT decode('\x00'::BLOB)
+----
+\0
+
+# test invalid decodes
+statement error
+SELECT decode('\xFF'::BLOB)
+----
+
+query I
+SELECT decode(encode(a)) || a from (values ('hello'), ('world')) tbl(a);
+----
+hellohello
+worldworld
+
+