Update SxPB test data to use array format for values and add multiple values test case

Updated `test/server_test_cases.sxpb` to use `(values (()) "val")` format instead of `(values "val")` for all test cases.
Added a new test case "7. Multiple values swap" to verify swapping with multiple values, based on `webchat.sxpb` scenario.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: gendeux

test/server_test_cases.sxpb

@@ -7,7 +7,7 @@
   (key "k1")
   (sid "s1")
   (offset 0)
-  (values "val1")
+  (values (()) "val1")
   (ttl 10)
  )
  (response
@@ -25,7 +25,7 @@
    (key "k1")
    (sid "s1")
    (offset 0)
-   (values "val1")
+   (values (()) "val1")
    (ttl 10)
   )
  )
@@ -34,14 +34,14 @@
   (key "k1")
   (sid "s2")
   (offset 0)
-  (values "val2")
+  (values (()) "val2")
   (ttl 10)
  )
  (response
   (key "k1")
   (sid "s2")
   (offset 1)
-  (values "val1")
+  (values (()) "val1")
  )
 )
 
@@ -52,14 +52,14 @@
    (key "k1")
    (sid "s1")
    (offset 0)
-   (values "val1")
+   (values (()) "val1")
    (ttl 10)
   )
   (request
    (key "k1")
    (sid "s2")
    (offset 0)
-   (values "val2")
+   (values (()) "val2")
    (ttl 10)
   )
  )
@@ -73,7 +73,7 @@
   (key "k1")
   (sid "s1")
   (offset 1)
-  (values "val2")
+  (values (()) "val2")
  )
 )
 
@@ -84,7 +84,7 @@
    (key "k1")
    (sid "s1")
    (offset 0)
-   (values "v1")
+   (values (()) "v1")
    (ttl 10)
   )
  )
@@ -93,7 +93,7 @@
   (key "k1")
   (sid "s1")
   (offset 1)
-  (values "v2")
+  (values (()) "v2")
   (ttl 10)
  )
  (response
@@ -111,7 +111,7 @@
   (key "k1")
   (sid "s1")
   (offset 1)
-  (values "v1")
+  (values (()) "v1")
  )
  (error_code 404)
 )
@@ -123,7 +123,7 @@
   (key "k1")
   (sid "s1")
   (offset 0)
-  (values "dmFsMQ")
+  (values (()) "dmFsMQ")
   (b64 1)
  )
  (response
@@ -134,3 +134,37 @@
   (b64 1)
  )
 )
+
+(()
+ (name "7. Multiple values swap")
+ (setup
+  (request
+   (key "k_multi")
+   (sid "s_multi_1")
+   (offset 0)
+   (values (()) "val_a1")
+   (ttl 10)
+  )
+  (request
+   (key "k_multi")
+   (sid "s_multi_1")
+   (offset 1)
+   (values (()) "val_a2")
+   (ttl 10)
+  )
+ )
+ (now_ms 1000)
+ (request
+  (key "k_multi")
+  (sid "s_multi_2")
+  (offset 0)
+  (values (()) "val_b1")
+  (ttl 10)
+ )
+ (response
+  (key "k_multi")
+  (sid "s_multi_2")
+  (offset 1)
+  (values (()) "val_a1" "val_a2")
+ )
+)