func (s *S) TestRebuildRoutesBetweenRouters(c *check.C) {
a := app.App{Name: "my-test-app", TeamOwner: s.team.Name}
err := app.CreateApp(&a, s.user)
c.Assert(err, check.IsNil)
err = provisiontest.ProvisionerInstance.AddUnits(&a, 1, "web", nil)
c.Assert(err, check.IsNil)
oldIp := a.Ip
a.Plan = app.Plan{Router: "fake-hc"}
_, err = rebuild.RebuildRoutes(&a)
c.Assert(err, check.IsNil)
c.Assert(a.Ip, check.Not(check.Equals), oldIp)
na, err := app.GetByName(a.Name)
c.Assert(err, check.IsNil)
c.Assert(na.Ip, check.Equals, a.Ip)
}