The week after a busy MWC, Viavi announced it is acquiring fellow tester and measurer Spirent Communications, for some $1.28 billion. Spirent has had a difficult year, and with strong momentum, Viavi has swooped to shore up its portfolio. The all-cash deal is expected to close in the second half of the year. Some $800 million comes from a seven-year loan from Wells Fargo, with another $400 million from Silver Lake Investment, which will give Silver Lake a board seat and an unspecified share in the company. The remainder is covered by Viavi’s cash reserves, and it secured a five-year revolving credit facility from Wells Fargo too. Viavi and Spirent are positioning this as a highly complementary deal, which will…