should be it

external/duckdb/test/sql/function/string/test_unicode.test

@@ -0,0 +1,54 @@
+# name: test/sql/function/string/test_unicode.test
+# description: UNICODE test
+# group: [string]
+
+statement ok
+PRAGMA enable_verification
+
+# test on scalars
+query IIIIII
+select UNICODE(NULL), UNICODE(''), UNICODE('$'), UNICODE('¢'), UNICODE('€'), UNICODE('𐍈')
+----
+NULL	-1	36	162	8364	66376
+
+# test on tables
+statement ok
+CREATE TABLE strings(a STRING, b STRING)
+
+statement ok
+INSERT INTO strings VALUES ('', 'Zero'), ('$', NULL), ('¢','Two'), ('€', NULL), ('𐍈','Four')
+
+query I
+select UNICODE(a) FROM strings
+----
+-1
+36
+162
+8364
+66376
+
+query I
+select UNICODE(b) FROM strings
+----
+90
+NULL
+84
+NULL
+70
+
+query I
+select UNICODE(a) FROM strings WHERE b IS NOT NULL
+----
+-1
+162
+66376
+
+# test incorrect usage
+statement error
+select UNICODE()
+----
+
+statement error
+select UNICODE(1, 2)
+----
+