cmd/tests: Add tests for stdout redirection and appending operators.

programs/cmd/tests/test_builtins.cmd

@@ -28,6 +28,38 @@ echo .word
 echo word@space@
 echo word@space@@space@
 
+echo ------------ Testing redirection operators --------------
+mkdir foobar & cd foobar
+echo ...stdout redirection
+echo foo>foo
+type foo
+echo foo 1> foo
+type foo
+echo foo1> foo
+type foo
+echo foo11> foo
+type foo
+echo foo12> foo
+type foo
+echo ...stdout appending
+echo foo>foo
+echo foo >>foo
+type foo
+del foo
+echo foob >> foo
+type foo
+echo fooc 1>>foo
+type foo
+echo food1>>foo
+type foo
+echo food2>>foo
+type foo
+del foo
+echo food21>>foo
+type foo
+cd ..
+rd /s/q foobar
+
 echo ------------ Testing ^^ escape character --------------
 rem Using something like "echo foo^" asks for an additional char after a "More?" prompt on the following line; it's not possible to currently test that non-interactively
 echo ^hell^o, world

programs/cmd/tests/test_builtins.cmd.exp

@@ -47,6 +47,27 @@ word
 .word
 word@space@
 word@space@@space@
+------------ Testing redirection operators --------------
+...stdout redirection
+foo
+foo@space@
+@todo_wine@foo1
+@todo_wine@foo11
+@todo_wine@foo12
+...stdout appending
+foo
+foo@space@
+foob@space@
+foob@space@
+fooc@space@
+foob@space@
+fooc@space@
+@todo_wine@food1
+@todo_wine@foob@space@
+@todo_wine@fooc@space@
+@todo_wine@food1
+@todo_wine@food2
+@todo_wine@food21
 @todo_wine@------------ Testing ^ escape character --------------
 @todo_wine@hello, world
 @todo_wine@hello, world