What is the test for obtaining a search warrant on the basis of an affidavit containing information supplied by four heroin addicts?

In a similar case, People v. Green, the court upheld a search warrant on the basis of an affidavit containing information supplied by four heroin addicts whose identities were not only known to the police but who were under arrest at the time. The police had further information from another known informant, also an addict, who was not under arrest. All the informants claimed defendant was selling heroin from his home and that they had seen it or purchased it there. The court found that although all five informants told a similar tale the affidavit established the information was furnished independently by each informer. Therefore, the court concluded, there was sufficient corroboration of the informants' tips to justify a search warrant. (117 Cal.App.3d at pp. 204-205, 172 Cal.Rptr. 582.)