from symengine.test_utilities import raises
from symengine import (Interval, EmptySet, FiniteSet, I, oo, Eq, Symbol,
    linsolve)
from symengine.lib.symengine_wrapper import solve

def test_solve():
    x = Symbol("x")
    reals = Interval(-oo, oo)

    assert solve(1, x, reals) == EmptySet
    assert solve(0, x, reals) == reals
    assert solve(x + 3, x, reals) == FiniteSet(-3)
    assert solve(x + 3, x, Interval(0, oo)) == EmptySet
    assert solve(x, x, reals) == FiniteSet(0)
    assert solve(x**2 + 1, x) == FiniteSet(-I, I)
    assert solve(x**2 - 2*x + 1, x) == FiniteSet(1)
    assert solve(Eq(x**3 + 3*x**2 + 3*x, -1), x, reals) == FiniteSet(-1)
    assert solve(x**3 - x, x) == FiniteSet(0, 1, -1)

def test_linsolve():
    x = Symbol("x")
    y = Symbol("y")
    assert linsolve([x - 2], [x]) == (2,)
    assert linsolve([x - 2, y - 3], [x, y]) == (2, 3)
    assert linsolve([x + y - 3, x + 2*y - 4], [x, y]) == (2, 1)