def testVariableIsolator(self):
eq = EquationBuilder().left_constant(1).left_variable(
'x', 2, 1).right_variable('x', 1, 2).build()
eq.apply_operation(Equation.VariableIsolator('x'))
isolated_eq = EquationBuilder().left_variable(
'x', 1, 1).right_constant_fraction(-2, 3).build()
self.assertEqual(eq, isolated_eq)
def testVariableIsolatorWithMoreVariables(self):
eq = EquationBuilder().left_constant(1).left_variable(
'x', 2, 1).left_variable('y', 1, 1).right_variable('x', 1,
1).build()
eq.apply_operation(Equation.VariableIsolator('x'))
isolated_eq = EquationBuilder().left_variable(
'x', 1, 1).right_constant(-1).right_variable('y', -1, 1).build()
self.assertEqual(eq, isolated_eq)
def testEquationSimplifyer(self):
eq = EquationBuilder().left_constant(1).left_variable(
'x', 2, 1).left_variable('x', 1,
2).right_default_constant().build()
eq.apply_operation(Equation.EquationSimplifyer())
simplified_eq = EquationBuilder().left_constant(1).left_variable(
'x', 5, 2).right_default_constant().build()
self.assertEqual(eq, simplified_eq)
def tesEquationApplier(self):
# 1 + 2x + y = x
eq = EquationBuilder().left_constant(1).left_variable(
'x', 2, 1).left_variable('y', 1, 1).right_variable('x', 1,
1).build()
# 1 +x -y = y +1 -> x = y + y -> x = 2y
eq2 = EquationBuilder().left_constant(1).left_variable(
'x', 1, 1).left_variable('y', -1, 1).right_variable(
'y', 1, 1).right_constant_fraction(1, 1).build()
# eq: 1 + 4y + y = 2y
eq.apply_operation(Equation.EquationApplier('x', eq2))
resultant_eq = EquationBuilder().left_constant(1).left_variable(
'y', 4, 1).left_variable('y', 1, 1).right_variable('y', 2,
1).build()
self.assertEqual(eq, resultant_eq)