function leap_year(year)
   -- Your solution here
end

-- Tests -----------------------------------------------------------------------

package.path = package.path .. ";../luaunit/?.lua"
local luaunit = require("luaunit")

function test_2004_is_leap_year()
   luaunit.assertTrue(leap_year(2004))
end

function test_1993_is_not_leap_year()
   luaunit.assertFalse(leap_year(1993))
end

function test_1900_is_not_leap_year()
   luaunit.assertFalse(leap_year(1900))
end

function test_2000_is_leap_year()
   luaunit.assertTrue(leap_year(2000))
end

os.exit(luaunit.LuaUnit.run())