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Finish calc.py tests; add docstrings, etc

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This commit is contained in:
Peter Baratta
2013-05-21 11:07:19 -04:00
parent 5e8d2ce4f7
commit 82482e89ea
1 changed files with 86 additions and 40 deletions
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126
common/lib/calc/tests/test_calc.py
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@@ -38,18 +38,19 @@ class EvaluatorTest(unittest.TestCase):
def test_exponential_answer(self):
''' Test for correct interpretation of scientific notation'''
answer = 50
correct_responses = ["50", "50.0", "5e1", "5e+1", "50e0", "50.0e0", "500e-1"]
correct_responses = ["50", "50.0", "5e1", "5e+1",
"50e0", "50.0e0", "500e-1"]
incorrect_responses = ["", "3.9", "4.1", "0", "5.01e1"]
for input_str in correct_responses:
result = calc.evaluator({}, {}, input_str)
fail_msg = "Failed when checking '{0}' against {1} (expected equality)".format(
fail_msg = "Expected '{0}' to equal {1}".format(
input_str, answer)
self.assertEqual(answer, result, msg=fail_msg)
for input_str in incorrect_responses:
result = calc.evaluator({}, {}, input_str)
fail_msg = "Failed when checking '{0}' against {1} (expected inequality)".format(
fail_msg = "Expected '{0}' to not equal {1}".format(
input_str, answer)
self.assertNotEqual(answer, result, msg=fail_msg)
@@ -62,9 +63,9 @@ class EvaluatorTest(unittest.TestCase):
('5.6n', 5.6e-9), ('4.2p', 4.2e-12)]
for (expr, answer) in test_mapping:
tolerance = answer * 1e-6 # Testing exactly fails for the large values
fail_msg = "Failure in testing suffix '{0}': '{1}' was not {2}".format(
expr[-1], expr, answer)
tolerance = answer * 1e-6 # Make rel. tolerance, because of floats
fail_msg = "Failure in testing suffix '{0}': '{1}' was not {2}"
fail_msg = fail_msg.format(expr[-1], expr, answer)
self.assertAlmostEqual(calc.evaluator({}, {}, expr), answer,
delta=tolerance, msg=fail_msg)
@@ -85,7 +86,7 @@ class EvaluatorTest(unittest.TestCase):
{}, {}, '1/0')
def test_parallel_resistors(self):
''' Test the special operator ||
''' Test the parallel resistor operator ||
The formula is given by
a || b || c ...
= 1 / (1/a + 1/b + 1/c + ...)
@@ -100,7 +101,6 @@ class EvaluatorTest(unittest.TestCase):
self.assertRaises(ZeroDivisionError, calc.evaluator,
{}, {}, '0||1')
def assert_function_values(self, fname, ins, outs, tolerance=1e-3):
''' Helper function to test many values at once
Test the accuracy of evaluator's use of the function given by fname
@@ -115,12 +115,12 @@ class EvaluatorTest(unittest.TestCase):
self.assertAlmostEqual(val, result, delta=tolerance, msg=fail_msg)
def test_trig_functions(self):
"""Test the trig functions provided in common/lib/calc/calc.py"""
# which are: sin, cos, tan, arccos, arcsin, arctan
"""Test the trig functions provided in common/lib/calc/calc.py
which are: sin, cos, tan, arccos, arcsin, arctan"""
angles = ['-pi/4', '0', 'pi/6', 'pi/5', '5*pi/4', '9*pi/4', 'j', '1 + j']
sin_values = [-0.707, 0, 0.5, 0.588, -0.707, 0.707, 1.175j, 1.298 + 0.635j]
cos_values = [0.707, 1, 0.866, 0.809, -0.707, 0.707, 1.543, 0.834 - 0.989j]
angles = ['-pi/4', '0', 'pi/6', 'pi/5', '5*pi/4', '9*pi/4', '1 + j']
sin_values = [-0.707, 0, 0.5, 0.588, -0.707, 0.707, 1.298 + 0.635j]
cos_values = [0.707, 1, 0.866, 0.809, -0.707, 0.707, 0.834 - 0.989j]
tan_values = [-1, 0, 0.577, 0.727, 1, 1, 0.762j, 0.272 + 1.084j]
# Cannot test tan(pi/2) b/c pi/2 is a float and not precise...
@@ -150,9 +150,10 @@ class EvaluatorTest(unittest.TestCase):
self.assert_function_values('arctan', arctan_inputs, arctan_angles)
def test_other_functions(self):
"""Test the other functions provided in common/lib/calc/calc.py"""
# sqrt, log10, log2, ln, abs,
# fact, factorial
"""Test the non-trig functions provided in common/lib/calc/calc.py
Specifically:
sqrt, log10, log2, ln, abs,
fact, factorial"""
# test sqrt
self.assert_function_values('sqrt',
@@ -212,8 +213,7 @@ class EvaluatorTest(unittest.TestCase):
delta=tolerance, msg=fail_msg)
def test_complex_expression(self):
"""We've only tried simple things so far, make sure it can handle a
more complexity than this."""
""" Calculate combinations of operators and default functions """
self.assertAlmostEqual(
calc.evaluator({}, {}, "(2^2+1.0)/sqrt(5e0)*5-1"),
@@ -227,40 +227,86 @@ class EvaluatorTest(unittest.TestCase):
self.assertAlmostEqual(
calc.evaluator({}, {}, "10||sin(7+5)"),
-0.567, delta=0.01)
self.assertAlmostEqual(calc.evaluator({}, {}, "sin(e)"),
0.41, delta=0.01)
self.assertAlmostEqual(calc.evaluator({}, {}, "k*T/q"),
0.025, delta=1e-3)
self.assertAlmostEqual(calc.evaluator({}, {}, "e^(j*pi)"),
-1, delta=1e-5)
def test_calc(self):
variables = {'R1': 2.0, 'R3': 4.0}
functions = {'sin': numpy.sin, 'cos': numpy.cos}
def test_simple_vars(self):
""" Substitution of variables into simple equations """
variables = {'x': 9.72, 'y': 7.91, 'loooooong': 6.4}
self.assertAlmostEqual(
calc.evaluator(variables, functions, "10||sin(7+5)"),
-0.567, delta=0.01)
self.assertEqual(calc.evaluator({'R1': 2.0, 'R3': 4.0}, {}, "13"), 13)
self.assertEqual(calc.evaluator(variables, functions, "13"), 13)
# Should not change value of constant
self.assertEqual(calc.evaluator(variables, {}, '13'), 13)
# Easy evaluation
self.assertEqual(calc.evaluator(variables, {}, 'x'), 9.72)
self.assertEqual(calc.evaluator(variables, {}, 'y'), 7.91)
self.assertEqual(calc.evaluator(variables, {}, 'loooooong'), 6.4)
# Test a simple equation
self.assertAlmostEqual(calc.evaluator(variables, {}, '3*x-y'),
21.25, delta=0.01) # = 3 * 9.72 - 7.91
self.assertAlmostEqual(calc.evaluator(variables, {}, 'x*y'),
76.89, delta=0.01)
# more, I guess
self.assertEqual(calc.evaluator({'x': 9.72, 'y': 7.91}, {}, "13"), 13)
self.assertEqual(calc.evaluator(variables, {}, "13"), 13)
self.assertEqual(
calc.evaluator({
'a': 2.2997471478310274, 'k': 9, 'm': 8,
'x': 0.66009498411213041},
{}, "5"),
5)
self.assertEqual(calc.evaluator(variables, functions, "R1*R3"), 8.0)
self.assertAlmostEqual(calc.evaluator(variables, functions, "sin(e)"), 0.41, delta=0.01)
self.assertAlmostEqual(calc.evaluator(variables, functions, "k*T/q"), 0.025, delta=1e-3)
self.assertAlmostEqual(calc.evaluator(variables, functions, "e^(j*pi)"), -1, delta=1e-5)
variables['t'] = 1.0
self.assertAlmostEqual(calc.evaluator(variables, functions, "t"), 1.0, delta=1e-5)
self.assertAlmostEqual(calc.evaluator(variables, functions, "T"), 1.0, delta=1e-5)
self.assertAlmostEqual(calc.evaluator(variables, functions, "t", cs=True), 1.0, delta=1e-5)
self.assertAlmostEqual(calc.evaluator(variables, functions, "T", cs=True), 298, delta=0.2)
def test_variable_case_sensitivity(self):
""" Test the case sensitivity flag and corresponding behavior """
self.assertEqual(
calc.evaluator({'R1': 2.0, 'R3': 4.0}, {}, "r1*r3"),
8.0)
variables = {'t': 1.0}
self.assertEqual(calc.evaluator(variables, {}, "t"), 1.0)
self.assertEqual(calc.evaluator(variables, {}, "T"), 1.0)
self.assertEqual(calc.evaluator(variables, {}, "t", cs=True), 1.0)
# Recall 'T' is a default constant, with value 298.15
self.assertAlmostEqual(calc.evaluator(variables, {}, "T", cs=True),
298, delta=0.2)
def test_simple_funcs(self):
""" Subsitution of custom functions """
variables = {'x': 4.712}
functions = {'id': lambda x: x}
self.assertEqual(calc.evaluator({}, functions, 'id(2.81)'), 2.81)
self.assertEqual(calc.evaluator({}, functions, 'id(2.81)'), 2.81)
self.assertEqual(calc.evaluator(variables, functions, 'id(x)'), 4.712)
functions.update({'f': numpy.sin})
self.assertAlmostEqual(calc.evaluator(variables, functions, 'f(x)'),
-1, delta=1e-3)
def test_function_case_sensitivity(self):
""" Test the case sensitivity of functions """
functions = {'f': lambda x: x,
'F': lambda x: x + 1}
# Which is it? will it call f or F?
# In any case, they should both be the same...
self.assertEqual(calc.evaluator({}, functions, 'f(6)'),
calc.evaluator({}, functions, 'F(6)'))
# except if we want case sensitivity...
self.assertNotEqual(calc.evaluator({}, functions, 'f(6)', cs=True),
calc.evaluator({}, functions, 'F(6)', cs=True))
def test_undefined_vars(self):
""" Check to see if the evaluator catches undefined variables """
variables = {'R1': 2.0, 'R3': 4.0}
self.assertRaises(calc.UndefinedVariable, calc.evaluator,
{}, {}, "5+7 QWSEKO")
self.assertRaises(calc.UndefinedVariable, calc.evaluator,
{'r1': 5}, {}, "r1+r2")
self.assertEqual(calc.evaluator(variables, functions, "r1*r3"), 8.0)
self.assertRaises(calc.UndefinedVariable, calc.evaluator,
variables, functions, "r1*r3", cs=True)
variables, {}, "r1*r3", cs=True)