add multi-layout support to back-end (#766)

* add multi-layout support to back-end

* remove obsolete code

* temporary code to apply heuristic choice of default layout

* fix tests

* update python tests

* more py lint

* PR review changes

* more PR lint

* PR lint

server/test/test_api.py

@@ -67,9 +67,11 @@ class EndPoints(unittest.TestCase):
         self.assertEqual(result.headers["Content-Type"], "application/octet-stream")
         df = decode_fbs.decode_matrix_FBS(result.content)
         self.assertEqual(df['n_rows'], 2638)
-        self.assertEqual(df['n_cols'], 2)
+        self.assertEqual(df['n_cols'], 8)
         self.assertIsNotNone(df['columns'])
-        self.assertIsNone(df['col_idx'])
+        self.assertListEqual(df['col_idx'], [
+            'pca_0', 'pca_1', 'tsne_0', 'tsne_1', 'umap_0', 'umap_1', 'draw_graph_fr_0', 'draw_graph_fr_1'
+        ])
         self.assertIsNone(df['row_idx'])
         self.assertEqual(len(df['columns']), df['n_cols'])
 

server/test/test_nan_scanpy_engine.py

@@ -12,7 +12,7 @@ from server.app.util.errors import FilterError
 class NaNTest(unittest.TestCase):
     def setUp(self):
         self.args = {
-            "layout": "umap",
+            "layout": ["umap"],
             "diffexp": "ttest",
             "max_category_items": 100,
             "obs_names": None,

server/test/test_scanpy_engine.py

@@ -15,7 +15,7 @@ from server.app.util.errors import FilterError
 class EngineTest(unittest.TestCase):
     def setUp(self):
         args = {
-            "layout": "umap",
+            "layout": ["umap"],
             "diffexp": "ttest",
             "max_category_items": 100,
             "obs_names": None,

server/test/test_scanpy_engine_data_load.py

@@ -15,7 +15,7 @@ class DataLoadEngineTest(unittest.TestCase):
 
     def test_delayed_load_args(self):
         args = {
-            "layout": "tsne",
+            "layout": ["tsne"],
             "diffexp": "ttest",
             "max_category_items": 1000,
             "obs_names": "foo",