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test_bnb_solver.py
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test_bnb_solver.py
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from branch_and_bound import Problem, RootProblem, Node, BranchAndBoundSolver
def test_problem_example_generator():
problem = Problem.example_generator()
assert isinstance(problem, Problem)
assert problem.sense in ["min", "max"]
def test_root_problem_initialization():
problem = Problem()
root_problem = RootProblem(problem)
assert root_problem.problem == problem
def test_node_initialization():
node = Node(None)
assert node._parent_node is None
def test_node_make_children():
problem = Problem()
node = Node.get_root_node(problem)
child = Node.create_child(node)
assert isinstance(child, Node)
assert child._parent_node == node
def test_node_fixed_var():
problem = Problem()
node = Node.get_root_node(problem)
assert node._fixed_var == None
assert node.get_fixed_vars() == []
node.add_fixed_var("var1", 1)
assert node._fixed_var == ("var1", 1)
assert node.get_fixed_vars() == [("var1", 1)]
def test_node_get_fixed_vars():
problem = Problem()
node1 = Node.get_root_node(problem)
node1.add_fixed_var("var1", 1)
node2 = Node.create_child(node1)
node2.add_fixed_var("var2", 2)
assert node1.get_fixed_vars() == [("var1", 1)]
assert node2.get_fixed_vars() == [("var2", 2), ("var1", 1)]
def test_solver_initialization():
problem = Problem()
solver = BranchAndBoundSolver(problem)
assert solver.problem == problem