Add unit tests for euclidean()

tests/measurements/test_euclidean.py

@@ -0,0 +1,25 @@
+import numpy as np
+import pytest
+
+import sdr
+
+X = np.array([[6, 5, 0, 0, 5], [0, 1, 5, 0, 3], [4, 3, 3, 0, 5]])
+Y = np.array([[7, 5, 2, 4, 0], [0, 0, 4, 1, 5], [5, 0, 7, 5, 6]])
+
+
+def test_axis_none():
+    d = sdr.euclidean(X, Y)
+    assert d.shape == ()
+    assert d == pytest.approx(10.246950765959598)
+
+
+def test_axis_0():
+    d = sdr.euclidean(X, Y, axis=0)
+    assert d.shape == (5,)
+    assert np.allclose(d, [1.41421356, 3.16227766, 4.58257569, 6.4807407, 5.47722558])
+
+
+def test_axis_1():
+    d = sdr.euclidean(X, Y, axis=1)
+    assert d.shape == (3,)
+    assert np.allclose(d, [6.78232998, 2.64575131, 7.21110255])