Added this test to check the XferCommand functionality

pactest/tests/xfercommand001.py

@@ -0,0 +1,20 @@
+self.description = "Quick check for using XferCommand"
+
+# this setting forces us to download packages
+self.cachepkgs = False
+#wget doesn't support file:// urls.  curl does
+self.option['xfercommand'] = ['/usr/bin/curl %u > %o']
+
+numpkgs = 10
+pkgnames = []
+for i in xrange(numpkgs):
+    name = "pkg_%s" % i
+    pkgnames.append(name)
+    p = pmpkg(name)
+    p.files = ["usr/bin/foo-%s" % i]
+    self.addpkg2db("sync", p)
+
+self.args = "-S %s" % ' '.join(pkgnames)
+
+for name in pkgnames:
+    self.addrule("PKG_EXIST=%s" % name)