source: class TriangleSoupTest {
  
      @Test
      public void testThatTriangleSoupIsInitiallyEmpty() {
  
target:         TriangleSoup soup = new TriangleSoup();
          List<Triangle2D> triangles = soup.getTriangles();
  
          Assert.assertNotNull("The returned list should not be null.", triangles);
          Assert.assertEquals("The triangle soup should not contain any triangles if no triangles were added.", 0,
                  triangles.size());
      }
  
  }