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Constraint Programming Solver
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test/store/store_test.exs
defmodule CPSolverTest.Store do
use ExUnit.Case
describe "Store" do
alias CPSolver.ConstraintStore
alias CPSolver.IntVariable, as: Variable
test "create variables in the space" do
v1_values = 1..10
v2_values = -5..5
values = [v1_values, v2_values]
variables = Enum.map(values, fn d -> Variable.new(d) end)
{:ok, bound_vars, _store} = ConstraintStore.create_store(variables)
## Bound vars have space and ids assigned
assert Enum.all?(bound_vars, fn var -> var end)
end
test "GET operations" do
v1_values = 1..10
v2_values = -5..5
v3_values = 1..1
values = [v1_values, v2_values, v3_values]
variables = Enum.map(values, fn d -> Variable.new(d) end)
{:ok, bound_vars, store} = ConstraintStore.create_store(variables)
# Min
assert Enum.all?(Enum.zip(bound_vars, values), fn {var, vals} ->
ConstraintStore.get(store, var, :min) == Enum.min(vals)
end)
# Max
assert Enum.all?(Enum.zip(bound_vars, values), fn {var, vals} ->
ConstraintStore.get(store, var, :max) == Enum.max(vals)
end)
# Size
assert Enum.all?(Enum.zip(bound_vars, values), fn {var, vals} ->
ConstraintStore.get(store, var, :size) == Range.size(vals)
end)
# Fixed?
assert Enum.all?(Enum.zip(bound_vars, values), fn {var, vals} ->
ConstraintStore.get(store, var, :fixed?) == (Range.size(vals) == 1)
end)
# Contains?
assert Enum.all?(Enum.zip(bound_vars, values), fn {var, vals} ->
Enum.all?(vals, fn val -> ConstraintStore.get(store, var, :contains?, [val]) end)
end)
end
test "UPDATE operations" do
v1_values = 1..10
v2_values = -5..5
v3_values = 1..2
values = [v1_values, v2_values, v3_values]
variables = Enum.map(values, fn d -> Variable.new(d) end)
{:ok, bound_vars, store} = ConstraintStore.create_store(variables, space: nil)
[v1, v2, v3] = bound_vars
# remove
refute Enum.any?(bound_vars, fn var ->
assert ConstraintStore.update(store, var, :remove, [1]) in [
:domain_change,
:min_change,
:fixed
]
ConstraintStore.get(store, var, :contains?, [1])
end)
assert ConstraintStore.get(store, v3, :fixed?)
assert ConstraintStore.get(store, v3, :min) == 2
# Remove on fixed var
assert :fail == catch_throw(ConstraintStore.update(store, v3, :remove, [2]))
# removeAbove
:max_change = ConstraintStore.update(store, v1, :removeAbove, [5])
assert ConstraintStore.get(store, v1, :max) == 5
assert ConstraintStore.get(store, v1, :min) == 2
# removeBelow
:min_change = ConstraintStore.update(store, v2, :removeBelow, [0])
assert ConstraintStore.get(store, v2, :max) == 5
assert ConstraintStore.get(store, v2, :min) == 0
# fix variable with value outside the domain
assert catch_throw(ConstraintStore.update(store, v1, :fix, [0])) == :fail
:fixed = ConstraintStore.update(store, v2, :fix, [0])
assert ConstraintStore.get(store, v2, :max) == 0
end
end
end