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Constraint Programming Solver
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test/model/model_test.exs
defmodule CpSolverTest.Model do
use ExUnit.Case
alias CPSolver.IntVariable, as: Variable
alias CPSolver.Model
alias CPSolver.Objective
alias CPSolver.Variable.Interface
describe "Model" do
alias CPSolver.Constraint.{LessOrEqual, Sum}
test "create" do
sum_bound = 1000
x_bound = 100
y_bound = 200
x = Variable.new(1..x_bound, name: "x")
y = Variable.new(1..y_bound, name: "y")
z = Variable.new(1..sum_bound)
variables = [x, y]
constraints = [LessOrEqual.new(x, y), Sum.new(z, [x, y])]
model =
Model.new(
variables,
constraints,
objective: Objective.minimize(z)
)
## Additional variable z is pulled from the Sum constraints
assert length(model.variables) == 3
## All variables are indexed starting from 1
assert Enum.all?(Enum.with_index(model.variables, 1), fn {var, idx} -> var.index == idx end)
## The variable in the objective has the same index as the variable in the all_vars list
assert model.objective.variable |> Interface.variable() |> Map.get(:index) == 3
end
end
end