fails:Kernel#exec raises Errno::EACCES when passed a directory
fails:Kernel#exec unsets other environment variables when given a true :unsetenv_others option
fails:Kernel#exec sets the current directory when given the :chdir option
fails:Kernel#exec with a single argument subjects the specified command to shell expansion
fails:Kernel#exec with a command array uses the first element as the command name and the second as the argv[0] value
fails:Kernel#exec with a command array coerces the argument using to_ary
fails:Kernel.exec raises Errno::EACCES when passed a directory
fails:Kernel.exec unsets other environment variables when given a true :unsetenv_others option
fails:Kernel.exec sets the current directory when given the :chdir option
fails:Kernel.exec with a single argument subjects the specified command to shell expansion
fails:Kernel.exec with a command array uses the first element as the command name and the second as the argv[0] value
fails:Kernel.exec with a command array coerces the argument using to_ary
