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fixpoint
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Constraint Programming Solver
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test/search/brancher_test.exs
defmodule CPSolverTest.Search.FirstFail do
use ExUnit.Case
alias CPSolver.Search
alias CPSolver.IntVariable, as: Variable
alias CPSolver.Search.DefaultBrancher
alias CPSolver.Utils.Vector
alias CPSolver.Variable.UnfixedTracker, as: Tracker
test "default brancher is the same as {:first_fail, :indomain_min}" do
v1_values = 0..9
v2_values = 1..10
# This domain (will be assigned to `v2` variable) is the smallest among unfixed
v3_values = 1..5
values = [v1_values, v2_values, v3_values]
variables = Enum.map(values, fn d -> Variable.new(d) end) |> Vector.new()
## Mocked space data
space_data = %{unfixed_variables_tracker: Tracker.new(variables), variables: variables}
_default_brancher_partitions =
[partition1, partition2] = Search.branch(DefaultBrancher, space_data)
## 1st partition has var3 fixed
%{variable_copies: vars, domain_changes: changes} = partition1.(space_data)
var3_copy = Vector.at(vars, 2)
assert Map.values(changes) == [:fixed]
assert Variable.fixed?(var3_copy) && Variable.min(var3_copy) == 1
## 2nd partition has min value (1) removed from var3
%{variable_copies: vars, domain_changes: changes} = partition2.(space_data)
var3_copy = Vector.at(vars, 2)
assert Map.values(changes) == [:min_change]
refute Variable.contains?(var3_copy, 1)
end
end