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 testGivenExpressionWithTwoVariablesSameNameWhenSimplifyThenExpressionWithOneVariableWithCorrectValueIsObtained(
self):
variable1 = VariableBuilder().name('x').build()
expression = ExpressionBuilder().term(variable1).term(variable1).term(
VariableBuilder().name('y').build()).default_constant().build()
expression.simplify_variable(variable1.name)
self.assertTrue(expression.get_value_variable(variable1.name),
2 * variable1.value)
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 testGivenExpressionWithVariablesWithSpecificNamesWhenGetValueNameWithOtherVariableNameThen0IsReturned(
self):
expression = ExpressionBuilder().term(
VariableBuilder().name('y').build()).term(VariableBuilder().name(
'z').build()).default_constant().build()
self.assertEqual(expression.get_value_variable('x'), 0)
def testGivenExpressionTwoWithVariablesWithDifferentNamesWhenGetValueNameThenCorrectVariableValueIsReturned(
self):
variable = VariableBuilder().name('x').build()
expression = ExpressionBuilder().term(
VariableBuilder().name('y').build()).term(variable).build()
self.assertEqual(expression.get_value_variable('x'), variable.value)
def testGivenExpressionWithVariableAndConstantWhenGetValueNameThenVariableValueIsReturned(
self):
variable = VariableBuilder().name('x').build()
expression = ExpressionBuilder().default_constant().term(
variable).build()
self.assertEqual(expression.get_value_variable('x'), variable.value)
