def testGivenEmptyEquationWhenAddTermThenTermIsAddedInBothSides(self):
equation = EquationBuilder().build()
term = VariableBuilder().build()
inverse_term = term.clon()
inverse_term.multiply(-1.0)
equation.add(term)
self.assertEqual(equation.get_name_set(), {term.name})
equation.add_side(Side.left, inverse_term)
equation.simplify_variable(Side.left, term.name)
self.assertEqual(equation.get_value_constant(Side.left), 0.0)
self.assertEqual(equation.get_name_set(), {term.name})
equation.add_side(Side.right, inverse_term)
equation.simplify_variable(Side.right, term.name)
self.assertEqual(equation.get_value_constant(Side.right), 0.0)
self.assertEqual(equation.get_name_set(), set())
def testGivenEquationSameConstantTwiceAtRightWhenSimplifyThenConstantIsSimplified(
self):
term = ConstantBuilder().build()
equation = EquationBuilder().right_term(term).right_term(term).build()
equation.simplify_constant(Side.right)
self.assertEqual(equation.get_value_constant(Side.right),
2 * term.value)
def testGivenEmptyEquationWhenAddConstantSideRightThenItIsAddedInRightSide(
self):
equation = EquationBuilder().build()
term = ConstantBuilder().value(1.0).build()
equation.add_side(Side.right, term)
self.assertEqual(equation.get_value_constant(Side.right), term.value)
def testGivenEmptyEquationWhenAddConstantThenItIsAddedInBothSides(self):
equation = EquationBuilder().build()
term = ConstantBuilder().build()
equation.add(term)
self.assertEqual(equation.get_value_constant(Side.left), term.value)
self.assertEqual(equation.get_value_constant(Side.right), term.value)
def testGivenEquationWithOneConstantAtRightWhenGetValueThenConstantValueIsReturned(
self):
constant = ConstantBuilder().build()
equation = EquationBuilder().right_term(constant).build()
self.assertEqual(equation.get_value_constant(Side.right),
constant.value)
def testGivenEmptyEquationWhenGetValueSideThenReturns0(self):
equation = EquationBuilder().build()
self.assertEqual(equation.get_value_constant(Side.left), 0)
self.assertEqual(equation.get_value_constant(Side.right), 0)