add tests

Author: jkotan

src/cpp/h5cpp/node/dataset.cpp

@@ -126,6 +126,7 @@ boost::python::object dataset_read(const hdf5::node::Dataset &self,
       Py_XINCREF(ptr);
 
       boost::python::handle<> h(ptr);
+      // CHECK
       data = boost::python::object(h);
     }
   }

test/h5cpp_tests/node_tests/dataset_io_test.py

@@ -131,6 +131,21 @@ def testWriteVariableLengthUTF8Scalar(self):
         else:
             self.assertEqual(read, bdata)
 
+    def testWriteVariableLengthEmptyScalar(self):
+        data = u""
+        bdata = b""
+        dtype = h5cpp.datatype.String.variable()
+        # dtype.encoding = h5cpp.datatype.CharacterEncoding.UTF8
+        dataset = Dataset(
+            self.root, h5cpp.Path("VariableLengthStringEmptyScalar"),
+            dtype, Scalar())
+        # dataset.write(data)
+        read = dataset.read()
+        if sys.version_info > (3,):
+            self.assertEqual(read, data)
+        else:
+            self.assertEqual(read, bdata)
+
     def testWriteIntegerArray(self):
 
         data = numpy.array([[1, 2, 3, 4], [5, 6, 7, 8]])