Use StableRNG for reliable tests?

[vtjnash]

It appears the tests are expecting a particularly RNG stream, which is not a feature of Random (even with seed), but is a feature of StableRNG, which may be a near drop-in replacement for it at

Ferrite.jl/test/test_grid_dofhandler_vtk.jl

Lines 71 to 72 in 4913364

	Random.seed!(1234)
	u = rand(ndofs(dofhandler))

==>

using StableRNG
const testrng = StableRNG(1234)

...
* rand(testrng) *
...

Refs https://s3.amazonaws.com/julialang-reports/nanosoldier/pkgeval/by_date/2021-06/09/Ferrite.1.7.0-DEV-f442e4230a.log