Function TEST

internal/ceres/program_test.cc:84–108

class TernaryCostFunction : public MockCostFunctionBase<2, 1, 1, 1> {};

TEST(Program, RemoveFixedBlocksNothingConstant) {
  ProblemImpl problem;
  double x;
  double y;
  double z;

  problem.AddParameterBlock(&x, 1);
  problem.AddParameterBlock(&y, 1);
  problem.AddParameterBlock(&z, 1);
  problem.AddResidualBlock(new UnaryCostFunction(), nullptr, &x);
  problem.AddResidualBlock(new BinaryCostFunction(), nullptr, &x, &y);
  problem.AddResidualBlock(new TernaryCostFunction(), nullptr, &x, &y, &z);

  std::vector<double*> removed_parameter_blocks;
  double fixed_cost = 0.0;
  std::string message;
  std::unique_ptr<Program> reduced_program(
      problem.program().CreateReducedProgram(
          &removed_parameter_blocks, &fixed_cost, &message));

  EXPECT_EQ(reduced_program->NumParameterBlocks(), 3);
  EXPECT_EQ(reduced_program->NumResidualBlocks(), 3);
  EXPECT_EQ(removed_parameter_blocks.size(), 0);
  EXPECT_EQ(fixed_cost, 0.0);
}

TEST(Program, RemoveFixedBlocksAllParameterBlocksConstant) {
  ProblemImpl problem;