Added basic unit tests of non-integrated functions

tests/test_utilities.py

@@ -0,0 +1,31 @@
+import numpy as np
+
+from openflexure_microscope import utilities
+
+
+def test_serialise_array_b64():
+    shape_in = (3, 2)
+    arr_in = np.random.randint(100, size=shape_in, dtype=np.int)
+
+    b64_string, dtype, shape = utilities.serialise_array_b64(arr_in)
+    assert b64_string
+    assert dtype == "int32"
+    assert shape == shape_in
+
+    arr_out = utilities.deserialise_array_b64(b64_string, dtype, shape)
+    assert np.array_equal(arr_out, arr_in)
+
+
+def test_ndarray_to_json():
+    shape_in = (3, 2)
+    arr_in = np.random.randint(100, size=shape_in, dtype=np.int)
+
+    json_out = utilities.ndarray_to_json(arr_in)
+
+    arr_out = utilities.json_to_ndarray(json_out)
+    assert np.array_equal(arr_out, arr_in)
+
+
+def test_axes_to_array():
+    dict_in = {"x": 1, "y": 2, "z": 3}
+    assert utilities.axes_to_array(dict_in) == [1, 2, 3]