test: allow writing to certain var directories

Closes Homebrew/homebrew#44458.

Closes Homebrew/homebrew#44773.

Signed-off-by: Xu Cheng <xucheng@me.com>

Library/Homebrew/cmd/test.rb

@@ -56,6 +56,9 @@ module Homebrew
             sandbox.allow_write_temp_and_cache
             sandbox.allow_write_log(f)
             sandbox.allow_write_xcode
+            sandbox.allow_write_path(HOMEBREW_PREFIX/"var/cache")
+            sandbox.allow_write_path(HOMEBREW_PREFIX/"var/log")
+            sandbox.allow_write_path(HOMEBREW_PREFIX/"var/run")
             sandbox.exec(*args)
           else
             exec(*args)