Add Ecto test case and coverage tool #38

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10 warnings

negative steps are not supported in Enum.slice/2, pass 37..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 31..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 69..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 43..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 69..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 43..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 83..-1//1 instead

negative steps are not supported in Enum.slice/2, pass 27..-1//1 instead