TEST: Minimal tests for AFNI BRIK/HEAD files

Includes new test file `example_4d+orig.BRIK/HEAD`

Author: rmarkello

nibabel/tests/data/example4d+orig.BRIK

@@ -0,0 +1,133 @@
+
+type = string-attribute
+name = DATASET_NAME
+count = 5
+'none~
+
+type = string-attribute
+name = TYPESTRING
+count = 15
+'3DIM_HEAD_ANAT~
+
+type = string-attribute
+name = IDCODE_STRING
+count = 27
+'AFN_-zxZ0OyZs8eEtm9syGBNdA~
+
+type = string-attribute
+name = IDCODE_DATE
+count = 25
+'Sun Oct  1 21:13:09 2017~
+
+type = integer-attribute
+name = SCENE_DATA
+count = 8
+ 0 2 0 -999 -999
+ -999 -999 -999
+
+type = string-attribute
+name = LABEL_1
+count = 5
+'none~
+
+type = string-attribute
+name = LABEL_2
+count = 5
+'none~
+
+type = integer-attribute
+name = ORIENT_SPECIFIC
+count = 3
+ 0 3 4
+
+type  = float-attribute
+name  = ORIGIN
+count = 3
+          -49.5        -82.312       -52.3511
+
+type  = float-attribute
+name  = DELTA
+count = 3
+              3              3              3
+
+type  = float-attribute
+name  = IJK_TO_DICOM
+count = 12
+              3              0              0          -49.5              0
+              3              0        -82.312              0              0
+              3       -52.3511
+
+type  = float-attribute
+name  = IJK_TO_DICOM_REAL
+count = 12
+              3              0              0          -49.5              0
+              3              0        -82.312              0              0
+              3       -52.3511
+
+type  = float-attribute
+name  = BRICK_STATS
+count = 6
+              0          13722              0          10051              0
+           9968
+
+type = integer-attribute
+name = TAXIS_NUMS
+count = 8
+ 3 25 77002 -999 -999
+ -999 -999 -999
+
+type  = float-attribute
+name  = TAXIS_FLOATS
+count = 8
+              0              3              0       -52.3511              3
+        -999999        -999999        -999999
+
+type  = float-attribute
+name  = TAXIS_OFFSETS
+count = 25
+      0.3260869       1.826087      0.3913043       1.891304      0.4565217
+       1.956521      0.5217391       2.021739      0.5869564       2.086956
+      0.6521738       2.152174      0.7173912       2.217391      0.7826086
+       2.282609      0.8478259       2.347826      0.9130433       2.413044
+      0.9782607       2.478261       1.043478       2.543479       1.108696
+
+type = integer-attribute
+name = DATASET_RANK
+count = 8
+ 3 3 0 0 0
+ 0 0 0
+
+type = integer-attribute
+name = DATASET_DIMENSIONS
+count = 5
+ 33 41 25 0 0
+
+type = integer-attribute
+name = BRICK_TYPES
+count = 3
+ 1 1 1
+
+type  = float-attribute
+name  = BRICK_FLOAT_FACS
+count = 3
+              0              0              0
+
+type = string-attribute
+name = TEMPLATE_SPACE
+count = 5
+'ORIG~
+
+type = integer-attribute
+name = INT_CMAP
+count = 1
+ 0
+
+type = string-attribute
+name = BYTEORDER_STRING
+count = 10
+'LSB_FIRST~
+
+type = string-attribute
+name = BRICK_LABS
+count = 9
+'#0~#1~#2~

nibabel/tests/data/example4d+orig.HEAD

@@ -0,0 +1,79 @@
+# emacs: -*- mode: python-mode; py-indent-offset: 4; indent-tabs-mode: nil -*-
+# vi: set ft=python sts=4 ts=4 sw=4 et:
+### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
+#
+#   See COPYING file distributed along with the NiBabel package for the
+#   copyright and license terms.
+#
+### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
+from __future__ import division, print_function, absolute_import
+
+from os.path import join as pjoin
+
+import numpy as np
+
+from .. import load, Nifti1Image
+from .. import brikhead
+
+from nose.tools import (assert_true, assert_equal)
+from numpy.testing import assert_array_equal
+from ..testing import data_path
+
+from .test_fileslice import slicer_samples
+from .test_helpers import assert_data_similar
+
+EXAMPLE_IMAGES = [
+    dict(
+        fname=pjoin(data_path, 'example4d+orig.BRIK'),
+        shape=(33, 41, 25, 3),
+        dtype=np.int16,
+        affine=np.array([[-3.0,0,0,49.5],
+                         [0,-3.0,0,82.312],
+                         [0,0,3.0,-52.3511],
+                         [0,0,0,1.0]]),
+        zooms=(3., 3., 3., 3.),
+        # These values from SPM2
+        data_summary=dict(
+            min=0,
+            max=13722,
+            mean=4266.76024636),
+        is_proxy=True)
+]
+
+
+class TestAFNIImage(object):
+    module = brikhead
+    test_files = EXAMPLE_IMAGES
+
+    def test_brikheadfile(self):
+        for tp in self.test_files:
+            brik = self.module.load(tp['fname'])
+            assert_equal(brik.get_data_dtype().type, tp['dtype'])
+            assert_equal(brik.shape, tp['shape'])
+            assert_equal(brik.header.get_zooms(), tp['zooms'])
+            assert_array_equal(brik.affine, tp['affine'])
+            data = brik.get_data()
+            assert_equal(data.shape, tp['shape'])
+
+    def test_load(self):
+        # Check highest level load of brikhead works
+        for tp in self.test_files:
+            img = load(tp['fname'])
+            data = img.get_data()
+            assert_equal(data.shape, tp['shape'])
+            # min, max, mean values
+            assert_data_similar(data, tp)
+            # check if file can be converted to nifti
+            ni_img = Nifti1Image.from_image(img)
+            assert_array_equal(ni_img.affine, tp['affine'])
+            assert_array_equal(ni_img.get_data(), data)
+
+    def test_array_proxy_slicing(self):
+        # Test slicing of array proxy
+        for tp in self.test_files:
+            img = load(tp['fname'])
+            arr = img.get_data()
+            prox = img.dataobj
+            assert_true(prox.is_proxy)
+            for sliceobj in slicer_samples(img.shape):
+                assert_array_equal(arr[sliceobj], prox[sliceobj])