Add test for specify shape in the new back-end.

theano/sandbox/gpuarray/tests/test_type.py

@@ -33,3 +33,10 @@ def test_values_eq_approx():
     b = a.copy()
     b[0] = -numpy.asarray(b[0])
     assert not GpuArrayType.values_eq_approx(a, b)
+
+
+def test_specify_shape():
+    a = rand_gpuarray(20, dtype='float32')
+    g = GpuArrayType(dtype='float32', broadcastable=(False,))('g')
+    f = theano.function([g], theano.tensor.specify_shape(g, [20]))
+    f(a)