Add integration test for Stratified W7 setup.

- setup method initializes the filepaths to the
  config file and atom data file, brings in the
  benchmark data and performs a run.

- methods to perform asserions for j_estimators
  and j_blue_estimators have been added.

tardis/tests/data/w7_13d/w7_collect.py

@@ -80,5 +80,3 @@ def collect_astropy_quantities_from_radial1d_model(expected_model):
 if __name__ == '__main__':
     # Quickly do the task the script it supposed to do if executed directly from terminal
     mdl = collect_expected_data()
-    import dill
-    dill.dump(mdl, open('session.pkl', 'w+'))

tardis/tests/test_tardis_full.py

@@ -143,3 +143,42 @@ def test_legacy_model_properties(self):
         for prop, prop_type in required_props.items():
 
             assert type(getattr(self.model, prop)) == prop_type, ("wrong type of attribute '{}': expected {}, found {}".format(prop, prop_type, type(getattr(self.model, prop))))
+
+
+@pytest.mark.skipif(not pytest.config.getoption("--run-slow"),
+                    reason='this is a slow test, add --run-slow to run')
+class TestW7:
+    """
+    Integration test for a run with the Stratified W7 setup.
+    """
+
+    @classmethod
+    @pytest.fixture(scope="class", autouse=True)
+    def setup(self):
+        self.w7_config_filepath = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data/w7_13d/tardis_w7.yml')
+        assert os.path.exists(self.w7_config_filepath), ("%s w7 config file doesn't exist" % self.w7_config_filepath)
+
+        self.atom_data_filepath = 'tmp/kurucz_cd23_chianti_H_He.h5'
+        assert os.path.exists(self.atom_data_filepath), ("%s atomic datafile doesn't exist" % self.atom_data_filepath)
+
+        self.obtained_w7_radial1d_model = tardis.run_tardis(
+            config=self.w7_config_filepath,
+            atom_data=self.atom_data_filepath)
+
+        self.expected_w7_ndarrays = np.load(
+            os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data/w7_13d/expected_ndarrays.npz')
+        )
+
+        self.expected_w7_astropy_quantities = np.load(
+            os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data/w7_13d/expected_quantities.npz')
+        )
+
+    def test_j_estimators(self):
+        np.testing.assert_allclose(
+                self.expected_w7_ndarrays['j_estimators'],
+                self.obtained_w7_radial1d_model.j_estimators)
+
+    def test_j_blue_estimators(self):
+        np.testing.assert_allclose(
+                self.expected_w7_ndarrays['j_blue_estimators'],
+                self.obtained_w7_radial1d_model.j_blue_estimators)