def test_add():
assert problem_three.operate(1, 3, "+") == 4, "failed on positive integers"
assert problem_three.operate(-5, -7,
"+") == -12, "failed on negative integers"
assert problem_three.operate(
-6, 14,
"+") == 8, "failed on positive and negative integer combination"
def test_subtract():
assert problem_three.operate(1, 3,
"-") == -2, "failed on positive integers"
assert problem_three.operate(-5, -7,
"-") == 2, "failed on negative integers"
assert problem_three.operate(
-6, 14,
"-") == -20, "failed on positive and negative integer combination"
def test_multiply():
assert problem_three.operate(1, 0,
"*") == 0, "failed on multiplication with 0"
assert problem_three.operate(1, 3, "*") == 3, "failed on positive integers"
assert problem_three.operate(-5, -7,
"*") == 35, "failed on negative integers"
assert problem_three.operate(
-6, 14,
"*") == -84, "failed on positive and negative integer combination"
def test_operator_rep():
with pytest.raises(TypeError) as excinfo:
problem_three.operate(4, 2, 1)
assert excinfo.value.args[0] == "oper must be a string"
def test_operator_types():
with pytest.raises(ValueError) as excinfo:
problem_three.operate(4, 2, "%")
assert excinfo.value.args[0] == "oper must be one of '+', '/', '-', or '*'"
def test_divide():
assert problem_three.operate(4, 2, "/") == 2, "integer division"
assert problem_three.operate(5, 4, "/") == 1.25, "float division"
with pytest.raises(ZeroDivisionError) as excinfo:
problem_three.operate(4, 0, "/")
assert excinfo.value.args[0] == "division by zero is undefined"