Use data path and fixtures consistently (#58)

* use data path and fixtures consistently

* fix formatting of long lists in test_cell_io

* move test_cell_io data to data dir

* refactor fixtures

brainglobe_utils/cells/cells.py

@@ -252,9 +252,16 @@ def group_cells_by_z(cells: List[Cell]) -> DefaultDict[float, List[Cell]]:
     """
     For a list of Cells return a dict of lists of cells, grouped by plane.
 
-    :param list cells: list of cells from cellfinder.cells.cells.Cell
-    :return:  defaultdict, with each key being a plane (e.g. 1280)
-    and each entry being a list of Cells
+    Parameters
+    ----------
+    cells : List of Cell
+        List of cells from cellfinder.cells.cells.Cell
+
+    Returns
+    -------
+    DefaultDict
+        defaultdict, with each key being a plane (e.g. 1280) and each entry
+        being a list of Cells
     """
     cells_groups = defaultdict(list)
     for cell in cells:

tests/data/IO/cell_io_vals/x_vals.csv

@@ -0,0 +1,13 @@
+181,2117,4082,2137,2129
+2141,2130,2130,2133,2141
+2162,2127,1801,2176,2194
+2664,2435,1266,568,2103
+2098,2105,2208,2162,2221
+2081,2230,2015,2072,1413
+1950,3340,2051,3362,2046
+2046,2046,2047,2032,2923
+2064,2267,2297,2004,2356
+2357,2359,2360,2365,2612
+2623,2657,2906,2165,2685
+2892,2896,2894,2901,2270
+1924,2505,2531,2542,2536

tests/data/IO/cell_io_vals/y_vals.csv

@@ -0,0 +1,13 @@
+2379,133,332,134,133
+134,132,133,136,136
+130,1026,336,134,134
+336,343,3427,2012,138
+138,140,135,134,137
+142,139,1045,141,2045
+1048,142,142,145,150
+151,151,151,146,147
+147,147,1068,149,521
+522,523,523,525,520
+520,521,522,524,522
+526,525,525,526,524
+974,522,527,524,523

tests/data/IO/cell_io_vals/z_vals.csv

@@ -0,0 +1,13 @@
+1282,1276,1281,1286,1276
+1278,1277,1278,1285,1297
+1274,1294,1290,1279,1280
+1296,1290,1294,1294,1285
+1279,1289,1275,1286,1281
+1284,1275,1291,1273,1294
+1294,1274,1274,1274,1283
+1287,1290,1294,1272,1275
+1275,1274,1292,1273,1288
+1286,1287,1289,1298,1274
+1274,1273,1275,1275,1278
+1286,1278,1288,1295,1279
+1282,1275,1276,1275,1286

tests/tests/conftest.py

@@ -0,0 +1,9 @@
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture
+def data_path():
+    """Directory storing all test data"""
+    return Path(__file__).parent.parent / "data"