def test_check_sdp_from_eigen_positive_err_messages():
"""Tests that if _check_sdp_from_eigen is given a negative tol it returns
an error, and if positive (or None) it does not"""
w = np.abs(np.random.RandomState(42).randn(10)) + 1
with pytest.raises(ValueError) as raised_error:
_check_sdp_from_eigen(w, -5.)
assert str(raised_error.value) == "tol should be positive."
with pytest.raises(ValueError) as raised_error:
_check_sdp_from_eigen(w, -1e-10)
assert str(raised_error.value) == "tol should be positive."
_check_sdp_from_eigen(w, 1.)
_check_sdp_from_eigen(w, 0.)
_check_sdp_from_eigen(w, None)
def test__check_sdp_from_eigen_positive_err_messages():
"""Tests that if _check_sdp_from_eigen is given a negative tol it returns
an error, and if positive (or None) it does not"""
w = np.abs(np.random.RandomState(42).randn(10)) + 1
with pytest.raises(ValueError) as raised_error:
_check_sdp_from_eigen(w, -5.)
assert str(raised_error.value) == "tol should be positive."
with pytest.raises(ValueError) as raised_error:
_check_sdp_from_eigen(w, -1e-10)
assert str(raised_error.value) == "tol should be positive."
_check_sdp_from_eigen(w, 1.)
_check_sdp_from_eigen(w, 0.)
_check_sdp_from_eigen(w, None)
def test__check_sdp_from_eigen_returns_definiteness(w, is_definite):
"""Tests that _check_sdp_from_eigen returns the definiteness of the
matrix (when it is PSD), based on the given eigenvalues"""
assert _check_sdp_from_eigen(w) == is_definite
def test__check_sdp_from_eigen_negative_eigenvalues(w):
"""Tests that _check_sdp_from_eigen, returns no error when the
eigenvalues are positive."""
_check_sdp_from_eigen(w)
def test__check_sdp_from_eigen_positive_eigenvalues(w):
"""Tests that _check_sdp_from_eigen, returns a NonPSDError when
the eigenvalues are negatives or null."""
with pytest.raises(NonPSDError):
_check_sdp_from_eigen(w)