def test_inferring_answers():
grader = IntervalGrader()
grader1 = IntervalGrader(answers="(1,2]")
grader2 = IntervalGrader(answers=["(", "1", "2", "]"])
assert grader1 == grader2
assert grader("(1,2]", "(1,2]") == grader1("(1,2]", "(1,2]")
assert grader("(1,2]", "(1,2)") == grader1("(1,2]", "(1,2)")
def test_subgraders():
assert IntervalGrader() == IntervalGrader(
subgrader=NumericalGrader(tolerance=1e-13, allow_inf=True))
# Make sure this instantiates
IntervalGrader(subgrader=FormulaGrader(tolerance=1e-13))
with raises(Error):
IntervalGrader(subgrader=StringGrader())
def test_usage():
grader = IntervalGrader()
assert grader("[1, 2)", "[1, 2)")['ok']
assert grader("[1, 2)", "[1, 2]")['grade_decimal'] == 0.5
assert grader("(1, 2)", "[1, 2]")['grade_decimal'] == 0
assert grader("(1, 2)", "(2, 3)")['grade_decimal'] == 0
grader = IntervalGrader(partial_credit=False)
assert grader("[1, 2)", "[1, 2]")['grade_decimal'] == 0
def test_messages():
grader = IntervalGrader(answers=[('[', {
'expect': '(',
'msg': 'testing'
}), '1', '2', ')'])
assert grader("[1, 2)", "(1, 2)")['msg'] == 'testing'
grader = IntervalGrader(answers=[('[', {
'expect': '(',
'msg': 'testing'
}), {
'expect': '1',
'msg': 'yay!'
}, '2', ')'])
assert grader("[1, 2)", "(1, 2)")['msg'] == 'yay!<br/>\ntesting'
def test_errors():
msg = r"Invalid opening bracket. The opening_brackets configuration allows for '\[', '\(' as opening brackets."
with raises(ConfigError, match=msg):
grader = IntervalGrader(answers=['{', '1', '2', ']'])
msg = r"Invalid closing bracket. The closing_brackets configuration allows for '\]', '\)' as closing brackets."
with raises(ConfigError, match=msg):
grader = IntervalGrader(answers=['(', '1', '2', '}'])
msg = r"Answer list must have 4 entries: opening bracket, lower bound, upper bound, closing bracket."
with raises(ConfigError, match=msg):
grader = IntervalGrader(answers=['(', '2', '}'])
with raises(ConfigError, match=msg):
grader = IntervalGrader(answers=['(', '2', '3', '5', '}'])
msg = r"Opening bracket must be a single character."
with raises(ConfigError, match=msg):
grader = IntervalGrader(answers=['(a', '2', '3', '}'])
msg = r"Closing bracket must be a single character."
with raises(ConfigError, match=msg):
grader = IntervalGrader(answers=['(', '2', '3', '}a'])
msg = r'Unable to read interval from answer: "abcd"'
with raises(ConfigError, match=msg):
grader = IntervalGrader()
grader('abcd', '1, 2, 3')
msg = r'Unable to read interval from answer: "2, 3"'
with raises(ConfigError, match=msg):
grader = IntervalGrader()
grader('[1,2]', '2, 3')
msg = r"Invalid opening bracket: '{'. Valid options are: '\[', '\('."
with raises(InvalidInput, match=msg):
grader = IntervalGrader()
grader('[1,2]', '{1, 2}')
msg = r"Invalid closing bracket: '}'. Valid options are: '\]', '\)'."
with raises(InvalidInput, match=msg):
grader = IntervalGrader()
grader('[1,2]', '[1, 2}')
def test_infinite_interval():
grader = IntervalGrader(answers="(0, infty)")
assert grader(None, '(0, infty)')['ok']
def test_formulas():
grader = IntervalGrader(answers="(x, y^2 + 1)",
subgrader=FormulaGrader(variables=['x', 'y']))
assert grader(None, '(x, y^2+1]')['grade_decimal'] == 0.5