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Environment/Versions Spirent iTest. Answer Both iTestCLI and iTestRT can be used for executing tests from the command line, but there are some fundamental differences. Think of iTestCLI as a command line wrapper on top of iTest – when it boots, it loads up all the iTest modules, including all the GUI components used for test authoring which are then suppressed after being loaded into memory. In contrast, iTestRT is the much leaner iTest execution engine extracted from iTest, without any of iTest’s test authoring and management capabilities. While iTestRT is limited in certain areas, iTestRT will eventually include all features and will completely replace iTestCLI.