text: #include <gtest/gtest.h>
  
  #include <fstream>
  
  #include "poisson.h"
  
  using namespace dealii;
  
  // Test Fixture for Poisson problem
  class PoissonTester : public ::testing::Test, public Poisson
  {
  public:
    PoissonTester() = default;
  };
  
  
  TEST_F(PoissonTester, MakeGrid)
  {
    make_grid();
  }