Added the unit test numpy_subarray.pyx

tests/run/numpy_subarray.pyx

+# tag: numpy
+
+cimport numpy as np
+cimport cython
+
+import numpy as py_numpy
+
+__doc__ = u"""
+
+    >>> test_record_subarray()
+    
+"""
+
+def test_record_subarray():
+    cdef np.ndarray x = py_numpy.zeros((2,2),
+                                       dtype=[('a', py_numpy.int32),
+                                              ('b', py_numpy.float64, (3, 3))])
+    cdef np.dtype descr   = x.dtype
+    cdef np.dtype a_descr = descr.fields['a'][0]
+    cdef np.dtype b_descr = descr.fields['b'][0]
+
+    assert descr.fields == {'a': (py_numpy.dtype('int32'), 0),
+                            'b': (py_numpy.dtype(('<f8', (3, 3))), 4)}
+    assert not np.PyDataType_HASSUBARRAY(descr)
+    assert not np.PyDataType_HASSUBARRAY(a_descr)
+    assert np.PyDataType_HASSUBARRAY(b_descr)
+
+    assert <tuple>b_descr.subarray.shape == (3, 3)