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Constraint Programming Solver
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test/domain/domain_test.exs
defmodule CPSolverTest.Domain do
use ExUnit.Case
describe "Default domain" do
alias CPSolver.DefaultDomain, as: Domain
test "creates domain from integer range and list" do
assert catch_throw(Domain.new([])) == :empty_domain
assert Domain.size(Domain.new(1..10)) == 10
int_list = [-1, 2, 4, 8, 10]
assert Domain.size(Domain.new(int_list)) == length(int_list)
end
test "fixed?" do
assert Domain.new([1]) |> Domain.fixed?()
refute Domain.new([1, 2]) |> Domain.fixed?()
end
test "min, max" do
values = [0, 2, 3, -1, 4, 10]
domain = Domain.new(values)
assert Domain.min(domain) == Enum.min(values)
assert Domain.max(domain) == Enum.max(values)
end
test "contains?" do
values = [1, 3, 7, -1, 0, -2, 10]
domain = Domain.new(values)
Enum.all?(values, fn v -> Domain.contains?(domain, v) end)
refute Domain.contains?(domain, 9)
end
test "remove, removeBelow, removeAbove" do
values = [0, 2, 3, -1, 4, 10]
domain = Domain.new(values)
{:domain_change, removeValue} = Domain.remove(domain, 3)
refute Domain.contains?(removeValue, 3)
assert Domain.size(removeValue) == length(values) - 1
{:min_change, cutBelow} = Domain.removeBelow(domain, 1)
assert Domain.min(cutBelow) >= 1
{:min_change, cutBelow} = Domain.removeBelow(domain, 3)
assert Domain.min(cutBelow) == 3
assert Domain.removeBelow(domain, Enum.max(values) + 1) == :fail
assert :no_change == Domain.removeBelow(domain, Enum.min(values))
{:fixed, fixed} = Domain.removeBelow(domain, Enum.max(values))
assert Domain.fixed?(fixed)
{:max_change, cutAbove} = Domain.removeAbove(domain, 1)
assert Domain.max(cutAbove) <= 1
{:max_change, cutAbove} = Domain.removeAbove(domain, 3)
assert Domain.max(cutAbove) == 3
assert Domain.removeAbove(domain, Enum.min(values) - 1) == :fail
assert :no_change == Domain.removeAbove(domain, Enum.max(values))
{:fixed, fixed} = Domain.removeAbove(domain, Enum.min(values))
assert Domain.fixed?(fixed)
end
test "fix" do
values = [0, -2, 4, 5, 6]
domain = Domain.new(values)
{:fixed, fixed} = Domain.fix(domain, 0)
assert Domain.fixed?(fixed)
assert Domain.min(fixed) == 0
assert Domain.max(fixed) == 0
assert :fail == Domain.fix(domain, 1)
end
end
end