Crash caused by invalid object dimensions

[giraldeau]

The test tribol/MfemCommonPlaneTest.common_plane/0 is crashing because of this failed assertion:

void SparseMatrix::AddMult(const Vector &x, Vector &y, const real_t a) const
{
   MFEM_ASSERT(width == x.Size(), "Input vector size (" << x.Size()
               << ") must match matrix width (" << width << ")");
...

The x vector is of size 1, while the width is equal to vdof 3 * 250 = 750. The reason is that the object construction in TestUtils.cpp:1747 is done using initializer list:

mfem::Vector ones{ fespace.GetVSize() };

This actually creates a vector of size 1 with the value 750. I think we would like to use the regular constructor to create a vector of size 750.

mfem::Vector ones( fespace.GetVSize() );

This error occurs at multiple places.