should be it

external/duckdb/test/sql/function/enum/test_enum_code.test

@@ -0,0 +1,46 @@
+# name: test/sql/function/enum/test_enum_code.test
+# description: Enum Code Function
+# group: [enum]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+CREATE TYPE mood AS ENUM ('sad', 'ok', 'happy', 'anxious')
+
+statement ok
+CREATE TABLE test (x mood)
+
+statement ok
+INSERT INTO test VALUES ('ok'), ('sad'), ('anxious'), ('happy')
+
+query I
+SELECT enum_code(x) FROM test
+----
+1
+0
+3
+2
+
+statement error
+SELECT enum_code('bla')
+----
+
+statement ok
+PREPARE p1 as SELECT enum_code(x) FROM test
+
+query I
+EXECUTE p1
+----
+1
+0
+3
+2
+
+statement ok
+PREPARE p2 as SELECT enum_code(?);
+
+query I
+EXECUTE p2('happy'::mood)
+----
+2

external/duckdb/test/sql/function/enum/test_enum_first.test

@@ -0,0 +1,19 @@
+# name: test/sql/function/enum/test_enum_first.test
+# description: Enum First Function
+# group: [enum]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple');
+
+query I
+SELECT enum_first(null::rainbow)
+----
+red
+
+statement error
+SELECT enum_first('bla')
+----
+<REGEX>:.*Binder Error.*This function needs an ENUM.*

external/duckdb/test/sql/function/enum/test_enum_last.test

@@ -0,0 +1,19 @@
+# name: test/sql/function/enum/test_enum_last.test
+# description: Enum First Function
+# group: [enum]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple');
+
+query I
+SELECT enum_last(null::rainbow)
+----
+purple
+
+statement error
+SELECT enum_last('bla')
+----
+<REGEX>:.*Binder Error.*This function needs an ENUM.*

external/duckdb/test/sql/function/enum/test_enum_range.test

@@ -0,0 +1,63 @@
+# name: test/sql/function/enum/test_enum_range.test
+# description: Enum Range Function
+# group: [enum]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple');
+
+statement ok
+CREATE TYPE currency AS ENUM ('usd', 'brl', 'eur');
+
+query I
+SELECT enum_range(null::rainbow)
+----
+[red, orange, yellow, green, blue, purple]
+
+query I
+SELECT enum_range_boundary('orange'::rainbow, 'green'::rainbow)
+----
+[orange, yellow, green]
+
+
+query I
+SELECT enum_range_boundary('green'::rainbow, 'orange'::rainbow)
+----
+[]
+
+query I
+SELECT enum_range_boundary(NULL, 'green'::rainbow)
+----
+[red, orange, yellow, green]
+
+query I
+SELECT enum_range_boundary('orange'::rainbow, NULL)
+----
+[orange, yellow, green, blue, purple]
+
+statement error
+SELECT enum_range_boundary('orange'::rainbow, 'brl'::currency)
+----
+<REGEX>:.*Binder Error.*parameters need to link.*
+
+statement error
+SELECT enum_range_boundary(NULL, NULL)
+----
+<REGEX>:.*Binder Error.*This function needs an ENUM.*
+
+statement error
+SELECT enum_last('bla')
+----
+<REGEX>:.*Binder Error.*This function needs an ENUM.*
+
+statement error
+SELECT enum_range_boundary('orange'::rainbow, 1)
+----
+<REGEX>:.*Binder Error.*This function needs an ENUM.*
+
+statement error
+SELECT enum_range_boundary(1, 'orange'::rainbow)
+----
+<REGEX>:.*Binder Error.*This function needs an ENUM.*