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Improve test coverage for CartanMatrix.jl #4295

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Increase test coverage of CartanMatrix.jl to prepare for #4263.

@lgoettgens lgoettgens added topic: LieAlgebras experimental Only changes experimental parts of the code labels Nov 9, 2024
if i != 2
@test_throws ArgumentError cartan_matrix(:G, i)
end
end
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can you transform this block of tests into tests for is_cartan_type and then test the cartan matrix constructor via

for i in -1:10, fam in (:A, :B, :C, :D, :E, :F, :G)
  if is_cartan_type(fam, i)
    cartan_matrix(fam, i)
  else
    @test_throws ArgumentError cartan_matrix(fam, i)
  end
end

?

@test cartan_symmetrizer(cartan_matrix((:C, 4), (:G, 2))) == [[1, 1, 1, 2]; [1, 3]]

@test cartan_symmetrizer(ZZ[2 -2 0; -1 2 -1; 0 -1 2]) == [1, 2, 2]
@test cartan_symmetrizer(ZZ[2 0 -1 0; 0 2 0 -2; -2 0 2 0; 0 -1 0 2]) == [2, 1, 1, 2]
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these are still indirectly tested via the bilinear form test below, right?

end

bil = cartan_bilinear_form(cm)
@test is_symmetric(bil) == true
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Suggested change
@test is_symmetric(bil) == true
@test is_symmetric(bil)

@lgoettgens
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Regarding the failure in the 1.10 CI, I think you told me that you know where this comes from and how to work around, right?

cartan_bilinear_form: Test Failed at /home/runner/work/Oscar.jl/Oscar.jl/experimental/LieAlgebras/test/CartanMatrix-test.jl:130
  Expression: is_symmetric(bil) == true
   Evaluated: false == true

https://github.com/oscar-system/Oscar.jl/actions/runs/11756190054/job/32752079537?pr=4295#step:10:5912

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