[5][Dev Test Case] Display main menu

[gabriel-lau]

Test cases for #15 and the results

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Unit tests done for displaying main menu.

Scenario	Description	Test Values	Expected Outcome	Actual Outcome	Pass/Fail
1	test_display_menu: Test whether menu is displaying correctly.	display_menu()	"MAIN MENU\n", "=========\n", "[1] Read and load maze from file\n", "[2] View maze\n", "[3] Play maze game\n", "[4] Configure current maze\n\n", "[0] Exit Maze\n"	Same as expected	Pass
2	test_looping_menu_exit: Test whether while loop ends when option 0 is selected.	Enter your option: 0	main([]) == False	Same as expected	Pass

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Test coverage achieved for displaying menu. Some parts such as error messages (print statements) when an option is selected were not tested using automated testing.