def testGivenExpressionWithTwoConstantsWhenSimplifyThenExpressionWithOneConstantWithCorrectValueIsObtained(
self):
constant1 = ConstantBuilder().build()
expression = ExpressionBuilder().term(constant1).term(
constant1).build()
expression.simplify_constant()
self.assertTrue(expression.get_value_constant(), 2 * constant1.value)
def testGivenExpressionWithVariableWhenMultiplyBy0ThenExpressionWithConstant0IsObtained(
self):
variable = VariableBuilder().build()
expression = ExpressionBuilder().term(variable).build()
expression.multiply(0.0)
self.assertEqual(expression.get_value_constant(), 0)
self.assertEqual(expression.get_value_variable(variable.name), 0.0)
def testGivenExpressionWithTwoVariablesWithSameNameWhenApplyAndSimplifyThenGetValueReturnsCorrectValue(
self):
expression = ExpressionBuilder().term(VariableBuilder().name('x').value(3.0).build()). \
term(VariableBuilder().name('x').value(2.0).build()).build()
expression.apply('x', 1.0)
expression.simplify_constant()
self.assertEqual(expression.get_value_constant(), 5.0)
def testGivenExpressionWithTwoConstantsWithInverseValuesWhenSimplifyThenExpressionWithConstantWithValue0IsObtained(
self):
constant1 = ConstantBuilder().build()
constant2 = constant1.clon()
constant2.multiply(-1.0)
expression = ExpressionBuilder().term(constant1).term(
constant2).build()
expression.simplify_constant()
self.assertEqual(expression.get_value_constant(), 0.0)
def testGivenExpressionWithTwoVariablesWithInverseValuesWhenSimplifyThenExpressionWithNoVariablesAndConstantWithValue0IsObtained(
self):
variable1 = VariableBuilder().build()
variable2 = variable1.clon()
variable2.multiply(-1.0)
expression = ExpressionBuilder().term(variable1).term(
variable2).build()
expression.simplify_variable(variable1.name)
self.assertEqual(expression.get_value_constant(), 0.0)
self.assertEqual(expression.get_value_variable(variable1.name), 0.0)
def testGivenExpressionWithConstantAndVariableWhenMultiplyThenGetValuesReturnsMultipliedTermsValues(
self):
constant = ConstantBuilder().build()
variable = VariableBuilder().build()
expression = ExpressionBuilder().term(constant).term(variable).build()
multiply_value = 2.0
expression.multiply(multiply_value)
constant.multiply(multiply_value)
variable.multiply(multiply_value)
self.assertEqual(expression.get_value_constant(), constant.value)
self.assertEqual(expression.get_value_variable(variable.name),
variable.value)
def testGivenExpressionWithOneVariableWhenAddExpressionWithOtherVariableAndConstantThenExpressionContainsAllTerms(
self):
variable1 = VariableBuilder().name('x').build()
variable2 = VariableBuilder().name('y').build()
constant = ConstantBuilder().value(1.0).build()
expression1 = ExpressionBuilder().term(variable1).build()
expression2 = ExpressionBuilder().term(variable2).term(
constant).build()
expression1.add_expression(expression2)
self.assertEqual(expression1.get_name_set(),
{variable1.name, variable2.name})
self.assertEqual(expression1.get_value_constant(), constant.value)
def testGivenExpressionWithConstantAndVariableWhenGetValueThenConstantValueIsReturned(
self):
constant = ConstantBuilder().build()
expression = ExpressionBuilder().term(
constant).default_variable().build()
self.assertEqual(expression.get_value_constant(), constant.value)
def testGivenEmptyExpressionWhenGetValueThen0IsReturned(self):
expression = ExpressionBuilder().build()
self.assertEqual(expression.get_value_constant(), 0)
def testGivenExpressionWithOnlyAVariableAsTermWhenGetValueThen0IsReturned(
self):
expression = ExpressionBuilder().default_variable().build()
self.assertEqual(expression.get_value_constant(), 0)
def testGivenExpressionWithOnlyAConstantAsTermWhenGetValueThenConstantValueIsReturned(
self):
constant = ConstantBuilder().build()
expression = ExpressionBuilder().build()
expression.add_term(constant)
self.assertEqual(expression.get_value_constant(), constant.value)
def testGivenExpressionWithVariableWhenApplyThenGetValueReturnsCorrectValue(
self):
expression = ExpressionBuilder().term(
VariableBuilder().name('x').value(3.0).build()).build()
expression.apply('x', 1.0)
self.assertEqual(expression.get_value_constant(), 3.0)
