Adds minimal ring_match test

import numpy as np

import pytest

from autocnet.matcher import cpu_ring_matcher as rm

@pytest.mark.parametrize('arr, expected', [

                         (np.array([[1,0],[1,1], [2,3]]), (1,2)),

                         (np.array([[0,0], [1,1], [2,2]]), (3,2)

                        )])

def test_check_pidx_duplicates(arr, expected):

    print(arr)

    pidx = rm.check_pidx_duplicates(arr)

    print(pidx)

    assert pidx.shape == expected

@pytest.mark.parametrize("a, b, threshold, expected", [

                         # Tests standard call

                         (np.array([1,2,3]), 

                          np.array([[1,2,3], [4,5,6], [7,8,9]]),

                          1.5, 

                          np.array([0])),

                          # Tests call where distances are too close

                        (np.array([1,2,3]),

                         np.array([[7,8,9], [1,2,4], [1,2,4.1]]),

                         1.5, 

                         None),

                         # Tests call with close distances where the threshold is low

                        (np.array([1,2,3]),

                         np.array([[7,8,9], [1,2,4], [1,2,4.1]]),

                         1., 

                         1),

                         # Tests call when np.argmin will fail

                        (np.array([np.nan, np.nan]),

                         np.array([[np.nan, np.nan], [np.nan, np.nan]]),

                         1.5,

                         None),

                         # Tests call where descriptors are identical

                        (np.array([1,2,3]),

                         np.array([[1,2,3], [1,2,3], [1,2,3]]),

                         1.5,

                         None)

])

def test_sift_match(a, b, threshold, expected):

    assert rm.sift_match(a, b, thresh=threshold) == expected    

 No newline at end of file