Add new sync012 pactest.

This test installs three packages with a circular dependency,
to check everything still goes fine in that case.

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>

pactest/tests/sync012.py

@@ -0,0 +1,20 @@
+self.description = "Install packages from a sync db with circular dependencies"
+
+sp1 = pmpkg("pkg1")
+sp1.depends = ["pkg2"]
+
+sp2 = pmpkg("pkg2")
+sp2.depends = ["pkg3"]
+
+sp3 = pmpkg("pkg3")
+sp3.depends = ["pkg1"]
+
+for p in sp1, sp2, sp3:
+	self.addpkg2db("sync", p);
+
+self.args = "-S %s" % sp1.name
+
+self.addrule("PACMAN_RETCODE=0")
+self.addrule("PKG_EXIST=pkg1")
+self.addrule("PKG_EXIST=pkg2")
+self.addrule("PKG_EXIST=pkg3")