Fix test_categories_as_list failing with peewee.OperationalError (#341)

Move test_categories_as_list into LCIATestCase2 (which uses BW2DataTest)
so it runs with a properly configured temporary project. The standalone
function had no bw2data project set up, causing peewee to fail when
match_subcategories called Database(biosphere_db_name) internally.

Author: cmutel

tests/strategies/lcia.py

@@ -409,6 +409,26 @@ def test_match_subcategories_not_remove(self):
         ]
         self.assertEqual(expected, match_subcategories(data, "b"))
 
+    def test_categories_as_list(self):
+        """issues/212 - categories given as list instead of tuple should not raise"""
+        data = [
+            {
+                "name": "Method 1",
+                "exchanges": [
+                    {
+                        "categories": [
+                            "air",
+                        ],
+                        "name": "Emission",
+                        "unit": "kg",
+                        "amount": 1.0,
+                    },
+                ],
+            }
+        ]
+        biosphere_db_name = "example_biosphere"
+        match_subcategories(data, biosphere_db_name)  # should pass without traceback
+
     def test_match_subcategories_makes_copies(self):
         """Should copy data instead of creating references, so that there are different amounts for different methods."""
         self.maxDiff = None
@@ -459,27 +479,6 @@ def test_match_subcategories_makes_copies(self):
             self.assertEqual(cf["amount"], 2)
 
 
-def test_categories_as_list():
-    """issues/212"""
-    data = [
-        {
-            "name": "Method 1",
-            "exchanges": [
-                {
-                    "categories": [
-                        "air",
-                    ],
-                    "name": "Emission",
-                    "unit": "kg",
-                    "amount": 1.0,
-                },
-            ],
-        }
-    ]
-    biosphere_db_name = "example_biosphere"
-    match_subcategories(data, biosphere_db_name)  # should pass without traceback
-
-
 def test_rationalize_method_names_no_remove_lt():
     given = [
         {"name": ("aw/o LT", "b", "c w/o LT")},