storage: restore testscripts/engine/keys

src/storage/testscripts/engine/keys

@@ -0,0 +1,61 @@
+# Tests various keys.
+
+# Keys are case-sensitive.
+set a=1
+get a
+get A
+---
+a → 1
+A → None
+
+set A=2
+get a
+get A
+---
+a → 1
+A → 2
+
+delete a
+delete A
+scan
+---
+ok
+
+# Empty keys and values are valid.
+set ""=""
+get ""
+scan
+delete ""
+---
+ → 
+ → 
+
+scan
+---
+ok
+
+# NUL keys and values are valid.
+set "\0"="\0"
+get "\0"
+scan
+delete "\0"
+---
+\x00 → \x00
+\x00 → \x00
+
+scan
+---
+ok
+
+# Unicode keys and values work, but are shown as raw UTF-8 bytes.
+set "👋"="👋"
+get "👋"
+scan
+delete "👋"
+---
+\xf0\x9f\x91\x8b → \xf0\x9f\x91\x8b
+\xf0\x9f\x91\x8b → \xf0\x9f\x91\x8b
+
+scan
+---
+ok