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Constraint Programming Solver
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test/utils/maximum_matching_test.exs
defmodule CPSolverTest.Utils.MaximumMatching do
use ExUnit.Case
describe "Maximum matching" do
alias CPSolver.IntVariable, as: Variable
alias CPSolver.Utils.MaximumMatching
test "maxflow graph" do
v1_values = 1..10
v2_values = 1..10
v3_values = 1..10
domains = [v1_values, v2_values, v3_values]
variables = Enum.map(domains, fn d -> Variable.new(d) end)
network = MaximumMatching.build_flow_network(variables)
## Vertices are: source, sink, 3 variables and 10 values
assert length(Graph.vertices(network)) == 2 + 3 + 10
## Edges from source to variables
assert length(Graph.out_edges(network, :s)) == 3
assert Enum.empty?(Graph.in_edges(network, :s))
## Edges from values to sink
assert length(Graph.in_edges(network, :t)) == 10
assert Enum.empty?(Graph.out_edges(network, :t))
## Edges from variables to values
assert Enum.all?(
Enum.with_index(domains),
fn {domain, idx} ->
## The only in-edge for vars is from :s
length(Graph.out_edges(network, {:variable, idx})) == 10 &&
length(Graph.in_edges(network, {:variable, idx})) == 1 &&
Enum.all?(domain, fn d ->
length(Graph.in_edges(network, {:value, d})) == 3 &&
length(Graph.out_edges(network, {:value, d})) == 1
end)
end
)
end
end
end