def test_decrement_cell(self):
"""
Test that executing a '-' operation decrements the cell
at the pointer by the correct amount.
"""
program = Program(1)
program.cell = 1
program.execute_one("-")
self.assertEqual(program.cell, 0, "Cell should be decremented to 0")
def test_loop(self):
"""
Test that a simple loop will repeat until the end condition
is met. The cell at the pointer should have a non-zero value
before the loop and be zero when after the loop.
"""
program = Program(1)
program.cell = 3
program.execute_one(["-"])
self.assertEqual(program.pointer, 0, "Pointer should be reduced to 0")