Fix split of os and os-release in system_requirements, and add unit test #609
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system_requirementssupports specifying an operating system like "ubuntu-16.04", in which case it's intended that the input is split along the hyphen andos = "ubuntu", os_release = "16.04". Currently, the following code causes a "non-character argument" error when this is attempted, asstrsplitattempts to run on aNULLvalue:This PR changes the above line to
os_release <- strsplit(os, "-", fixed = TRUE)[[1]], and adds a unit test to ensure that we can determine system dependencies for thecurlpackage when the operating system is specified as "ubuntu-16.04".