TEST: Check for failing GIFTI encodings

Author: effigies

nibabel/gifti/tests/test_gifti.py

@@ -21,6 +21,7 @@
 from nibabel.testing import clear_and_catch_warnings
 from .test_parse_gifti_fast import (DATA_FILE1, DATA_FILE2, DATA_FILE3,
                                     DATA_FILE4, DATA_FILE5, DATA_FILE6)
+import itertools
 
 
 def test_gifti_image():
@@ -400,3 +401,20 @@ def test_data_array_round_trip():
     gio = GiftiImage.from_file_map(fmap)
     vertices = gio.darrays[0].data
     assert_array_equal(vertices, verts)
+
+
+def test_type_coercion():
+    dtypes = (np.uint8, np.int32, np.int64, np.float32, np.float64)
+    encodings = ('ASCII', 'B64BIN', 'B64GZ')
+    for data_dtype, darray_dtype, encoding in itertools.product(dtypes,
+                                                                dtypes,
+                                                                encodings):
+        da = GiftiDataArray(np.arange(10).astype(data_dtype),
+                            encoding=encoding,
+                            intent='NIFTI_INTENT_NODE_INDEX',
+                            datatype=darray_dtype)
+        gii = GiftiImage(darrays=[da])
+        gii_copy = GiftiImage.from_bytes(gii.to_bytes())
+        da_copy = gii_copy.darrays[0]
+        assert_equal(np.dtype(da_copy.data.dtype), np.dtype(darray_dtype))
+        assert_array_equal(da_copy.data, da.data)