Create balanced brackets exercise

balanced_brackets.lua

@@ -0,0 +1,54 @@
+-- Solution --------------------------------------------------------------------
+function is_balanced(input)
+	-- Your implementation here
+end
+
+-- Tests -----------------------------------------------------------------------
+
+local luaunit = require("luaunit.luaunit")
+
+function test_single_paren_is_not_balanced()
+	luaunit.assertFalse(is_balanced("("))
+end
+
+function test_paren_pair_is_balanced()
+	luaunit.assertTrue(is_balanced("()"))
+end
+
+function test_inverted_paren_pair_is_not_balanced()
+	luaunit.assertFalse(is_balanced(")("))
+end
+
+function test_nested_parens_are_balanced()
+	luaunit.assertTrue(is_balanced("(())"))
+end
+
+function test_double_open_single_close_paren_is_not_balanced()
+	luaunit.assertFalse(is_balanced("(()"))
+end
+
+function test_single_open_double_close_brace_is_not_balanced()
+	luaunit.assertFalse(is_balanced("{}}"))
+end
+
+function test_nested_parens_and_brackets_are_balanced()
+	luaunit.assertTrue(is_balanced("([])"))
+end
+
+function test_nested_brackets_and_braces_are_balanced()
+	luaunit.assertTrue(is_balanced("({})"))
+end
+
+function test_sequence_of_paren_bracket_and_brace_pairs_are_balanced()
+	luaunit.assertTrue(is_balanced("()[]{}"))
+end
+
+function test_balanced_combination_of_nesting_and_sequencing()
+	luaunit.assertTrue(is_balanced("(([]{}))[()[[]]]"))
+end
+
+function test_interwoven_paren_and_bracket_pairs_are_not_balanced()
+	luaunit.assertFalse(is_balanced("([)]"))
+end
+
+os.exit(luaunit.LuaUnit.run())