[2][Dev Test Case] View maze

[gabriel-lau]

Test cases for #3 and the results

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Unit tests done for viewing maze.
maze_normal variable below is a nested list of maze items.

Scenario	Description	Test Values	Expected Outcome	Actual Outcome	Pass/Fail
1	test_display_maze_available(): Test whether maze is displayed when a maze is found in maze_list	display_maze(maze_normal)	maze_normal	Same as expected	Pass
2	test_display_maze_empty(): Test when there is no maze found in maze_list	display_maze([])	Returns 'No maze in memory. Load your maze file through Option 1!'	Same as expected	Pass

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Test coverage achieved for viewing maze (+ displaying & file reading).