IBM (NYSE: IBM) is beefing up its ability to help customers test software programs for “cloud computing,” systems integration and services with its purchase of Green Hat.

The deal was announced Wednesday. Financial terms were not disclosed.

IBM has announced four acquisitions over the past month.

Green Hat, which is based in Delaware and London, offers automated testing tools. Its technology will be incorporated into IBM’s Rational group, which offers software development tools and testing.

“Historically, to run simulation testing on a software program, a development team must construct an actual testing lab made up of both hardware and software,” IBM said in the deal announcement. “This time consuming and labor intensive process has become even more compounded with the short development cycle needed to compete in rapidly expanding markets such as those for smart phones and tablets. By using Green Hat’s solutions, a virtual test environment can be set up in a matter of minutes versus weeks, and for a fraction of the cost.”

“This acquisition extends IBM’s leadership in driving business agility and software quality by changing the way enterprises can manage software development cost, test cycle time and risk,” added Kristof Kloeckner, general manager of IBM Rational. “Together, we offer the most complete solution available today for agile software development and testing, with flexible options such as the cloud. Green Hat’s application virtualization capabilities will help our customers accelerate their delivery of business critical software.”

Green Hat has a global customer base with expertise in cloud computing, web services, messaging, service oriented architecture, business process management, complex event processing and SAP.

IBM employs some 10,000 people across North Carolina.

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