Add version method to backend, mirroring 'name', and add basic tests (Q…

…iskit#3165)

qiskit/providers/basebackend.py

@@ -99,6 +99,14 @@ def name(self):
         """
         return self._configuration.backend_name
 
+    def version(self):
+        """Return the backend version.
+
+        Returns:
+            str: the X.X.X version of the backend.
+        """
+        return self._configuration.backend_version
+
     def __str__(self):
         return self.name()
 

test/python/providers/test_base_backend.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+
+# This code is part of Qiskit.
+#
+# (C) Copyright IBM 2019.
+#
+# This code is licensed under the Apache License, Version 2.0. You may
+# obtain a copy of this license in the LICENSE.txt file in the root directory
+# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
+#
+# Any modifications or derivative works of this code must retain this
+# copyright notice, and modified files need to carry a notice indicating
+# that they have been altered from the originals.
+
+# pylint: disable=missing-docstring
+
+"""Test BaseBackend methods."""
+
+from qiskit.test import QiskitTestCase
+from qiskit.test.mock import FakeOpenPulse2Q, FakeMelbourne
+
+
+class TestBaseBackend(QiskitTestCase):
+    """Test the backend methods."""
+
+    def setUp(self):
+        self.pulse_backend = FakeOpenPulse2Q()
+        self.backend = FakeMelbourne()
+
+    def test_name(self):
+        """Test that name can be extracted."""
+        self.assertEqual(self.pulse_backend.name(), 'fake_openpulse_2q')
+        self.assertEqual(self.backend.name(), 'fake_melbourne')
+
+    def test_version(self):
+        """Test that name can be extracted."""
+        self.assertEqual(self.pulse_backend.version(), '0.0.0')
+        self.assertEqual(self.backend.version(), '0.0.0')
+
+    def test_str_and_repr(self):
+        """Test the custom __str__ and __repr__ methods."""
+        self.assertEqual(str(self.pulse_backend), 'fake_openpulse_2q')
+        self.assertEqual(str(self.backend), 'fake_melbourne')
+        self.assertEqual(repr(self.pulse_backend),
+                         "<FakeOpenPulse2Q('fake_openpulse_2q') from None()>")