def testDetGradOfSingularMatrixCorank1(self):
    # Rank 2 matrix with nonzero gradient
    a = jnp.array([[ 50, -30,  45],
                  [-30,  90, -81],
                  [ 45, -81,  81]], dtype=jnp.float32)
    jtu.check_grads(jnp.linalg.det, (a,), 1, atol=1e-1, rtol=1e-1)