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Add test for C++ Constraint::scale() #1285

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Merged
arcondello merged 1 commit into from
Nov 3, 2022
Merged

Add test for C++ Constraint::scale() #1285

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50 changes: 50 additions & 0 deletions testscpp/tests/test_constrained_quadratic_model.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -468,6 +468,56 @@ TEST_CASE("Bug 0") {
}
}

TEST_CASE("Test Constraint::scale()") {
GIVEN("A CQM with several constraints") {
auto cqm = dimod::ConstrainedQuadraticModel<double>();
cqm.add_variables(Vartype::BINARY, 1);
auto c0 = cqm.add_linear_constraint({0}, {4}, Sense::EQ, 2);
auto c1 = cqm.add_linear_constraint({0}, {4}, Sense::LE, 2);
auto c2 = cqm.add_linear_constraint({0}, {4}, Sense::GE, 2);

cqm.constraint_ref(c0).set_offset(8);
cqm.constraint_ref(c1).set_offset(8);
cqm.constraint_ref(c2).set_offset(8);

WHEN("we scale the constraints by a positive number") {
cqm.constraint_ref(c0).scale(.5);
cqm.constraint_ref(c1).scale(.5);
cqm.constraint_ref(c2).scale(.5);

THEN("the biases are scaled and everything else stays the same") {
for (auto c = c0; c <= c2; ++c) {
CHECK(cqm.constraint_ref(c).offset() == 4);
CHECK(cqm.constraint_ref(c).linear(0) == 2);
CHECK(cqm.constraint_ref(c).rhs() == 1);
}

CHECK(cqm.constraint_ref(c0).sense() == Sense::EQ);
CHECK(cqm.constraint_ref(c1).sense() == Sense::LE);
CHECK(cqm.constraint_ref(c2).sense() == Sense::GE);
}
}

WHEN("we scale the constraints by a negative number") {
cqm.constraint_ref(c0).scale(-.5);
cqm.constraint_ref(c1).scale(-.5);
cqm.constraint_ref(c2).scale(-.5);

THEN("the biases are scaled and some of the signs flip") {
for (auto c = c0; c <= c2; ++c) {
CHECK(cqm.constraint_ref(c).offset() == -4);
CHECK(cqm.constraint_ref(c).linear(0) == -2);
CHECK(cqm.constraint_ref(c).rhs() == -1);
}

CHECK(cqm.constraint_ref(c0).sense() == Sense::EQ);
CHECK(cqm.constraint_ref(c1).sense() == Sense::GE); // flipped
CHECK(cqm.constraint_ref(c2).sense() == Sense::LE); // flipped
}
}
}
}

TEST_CASE("Test CQM.add_constraint()") {
GIVEN("A CQM and a BQM") {
auto cqm = dimod::ConstrainedQuadraticModel<double>();
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