public void GetAllCategories_NoScenario_ReturnAllCategoryTitles()
{
BudgetModel model = new BudgetModel();
string[] expected = { "FOOD", "CLOTHES", "OTHER" };
for (int i = 0; i < expected.Length; i++)
{
model.AddCategory(expected[i]);
}
string[] actual = model.GetAllCategories();
bool result = expected.SequenceEqual(actual);
Assert.IsTrue(result);
}