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from sympy.tensor.tensor import (Tensor, TensorIndexType, TensorSymmetry,
        tensor_indices, TensorHead, TensorElement)
from sympy.tensor import Array
from sympy import Symbol


def test_tensor_element():
    L = TensorIndexType("L")
    i, j, k, l, m, n = tensor_indices("i j k l m n", L)

    A = TensorHead("A", [L, L], TensorSymmetry.no_symmetry(2))

    a = A(i, j)

    assert isinstance(TensorElement(a, {}), Tensor)
    assert isinstance(TensorElement(a, {k: 1}), Tensor)

    te1 = TensorElement(a, {Symbol("i"): 1})
    assert te1.free == [(j, 0)]
    assert te1.get_free_indices() == [j]
    assert te1.dum == []

    te2 = TensorElement(a, {i: 1})
    assert te2.free == [(j, 0)]
    assert te2.get_free_indices() == [j]
    assert te2.dum == []

    assert te1 == te2

    array = Array([[1, 2], [3, 4]])
    assert te1.replace_with_arrays({A(i, j): array}, [j]) == array[1, :]

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