cmd/tests: Add tests for && on success conditional execution.

programs/cmd/tests/test_builtins.cmd

@@ -106,6 +106,13 @@ if exist foobazbar (
     cd ..
     rd /s/q foobar
 ) else echo foobar deleted
+echo ...on success conditional ^&^&
+call :setError 456 && echo foo3 > foo3
+if exist foo3 (
+    echo foo3 created
+    del foo3
+) else echo foo3 not created
+echo bar4 && echo foo4
 
 echo ------------ Testing type ------------
 echo bar> foobaz

programs/cmd/tests/test_builtins.cmd.exp

@@ -96,6 +96,10 @@ foo1
 bar2@space@
 foo2
 @todo_wine@foobar deleted
+@todo_wine@...on success conditional &&
+@todo_wine@foo3 not created
+bar4@space@
+foo4
 ------------ Testing type ------------
 
 @pwd@>type foobaz@space@