Enumerate the exercises

02_leap_years.lua

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+-- Implement is_leap_year() below, returning whether the given year is
+-- a leap year according to the Gregorian calendar.
+--
+-- Solution --------------------------------------------------------------------
+function is_leap_year(year)
+	-- Your implementation here
+end
+
+-- Tests -----------------------------------------------------------------------
+
+local luaunit = require("luaunit.luaunit")
+
+function test_2004_is_leap_year()
+	luaunit.assertTrue(is_leap_year(2004))
+end
+
+function test_1993_is_not_leap_year()
+	luaunit.assertFalse(is_leap_year(1993))
+end
+
+function test_1900_is_not_leap_year()
+	luaunit.assertFalse(is_leap_year(1900))
+end
+
+function test_2000_is_leap_year()
+	luaunit.assertTrue(is_leap_year(2000))
+end
+
+os.exit(luaunit.LuaUnit.run())