Add new pactest that is backwards of sync022

sync022 was added here:
39b6549655

This pactest reverses the installed package to see if it is correctly
picked, in order to test some further changes to this depcheck code that
currently makes sync022 fail.

Signed-off-by: Dan McGee <dan@archlinux.org>

pactest/tests/sync022.py

@@ -1,4 +1,4 @@
-self.description = "Installs a group with two conflicting packages, one replacing the other"
+self.description = "Install group with two conflicting packages, one replacing other"
 
 sp1 = pmpkg("pkg1")
 sp1.groups = ["grp"]

pactest/tests/sync023.py

@@ -0,0 +1,22 @@
+self.description = "Install group with two conflicting packages, one replacing other (backwards)"
+
+sp1 = pmpkg("pkg1")
+sp1.groups = ["grp"]
+sp1.provides = ["pkg2"]
+sp1.conflicts = ["pkg2"]
+sp1.replaces = ["pkg2"]
+self.addpkg2db("sync", sp1);
+
+sp2 = pmpkg("pkg2")
+sp2.groups = ["grp"]
+self.addpkg2db("sync", sp2);
+
+lp1 = pmpkg("pkg2")
+lp1.groups = ["grp"]
+self.addpkg2db("local", lp1);
+
+self.args = "-S %s" % "grp"
+
+self.addrule("PACMAN_RETCODE=0")
+self.addrule("PKG_EXIST=pkg1");
+self.addrule("!PKG_EXIST=pkg2");