message: Fix yet another bug in the unit test FormLinearSystem/SolutionScope:
  the LinearForm was not assembled.
diff: @@ -88,6 +88,7 @@ TEST_CASE("FormLinearSystem/SolutionScope",
  ConstantCoefficient f(1.0);
  LinearForm b(&fes);
  b.AddDomainIntegrator(new DomainLFIntegrator(f));
  + b.Assemble();
  // Bilinear form: matrix
  BilinearForm a(&fes);
  a.AddDomainIntegrator(new DiffusionIntegrator);
  