Describe("SetNamespace", func() {
var link netlink.Link
BeforeEach(func() {
link = &netlink.Dummy{}
netlinker.LinkByNameReturns(link, nil)
})
It("associates the link with a file descriptor", func() {
err := factory.SetNamespace("link-name", 99)
Expect(err).NotTo(HaveOccurred())
Expect(netlinker.LinkByNameCallCount()).To(Equal(1))
Expect(netlinker.LinkByNameArgsForCall(0)).To(Equal("link-name"))
Expect(netlinker.LinkSetNsFdCallCount()).To(Equal(1))
l, fd := netlinker.LinkSetNsFdArgsForCall(0)
Expect(l).To(Equal(link))
Expect(fd).To(Equal(99))
})
Context("when finding the link fails", func() {
BeforeEach(func() {
netlinker.LinkByNameReturns(nil, errors.New("no link for you"))
})
It("returns a meaningful error", func() {
err := factory.SetNamespace("link-name", 99)
Expect(err).To(MatchError("failed to find link: no link for you"))
})