backed mode unittest added

Author: kennypavan

tests/testDatabase.py

@@ -13,15 +13,28 @@ def setUp(self):
 		self.db_file = os.path.join(self.db_path, f"{self.db_name}.asql")
 
 	def test_build_database(self):
-		if os.path.exists(self.db_file): #tearDown here. We need this file
+		if os.path.exists(self.db_file): #tearDown 
 			os.remove(self.db_file)
 		MakeDb(adata=self.adata, db_name=self.db_name, db_path=self.db_path)
 		self.assertTrue(os.path.exists(self.db_file))
 
 	def test_query_database(self):
 		adata_sql = AnnSQL.AnnSQL(db=self.db_file)
 		result = adata_sql.query("SELECT * FROM X")
-		if os.path.exists(self.db_file): #tearDown here. We need this file
+		if os.path.exists(self.db_file): #tearDown
+			os.remove(self.db_file)
+		self.assertEqual(len(result), self.adata.shape[0])
+
+	def test_backed_mode(self):
+		self.adata = sc.datasets.pbmc3k_processed()
+		self.adata = sc.read_h5ad("data/pbmc3k_processed.h5ad", backed="r+")
+		MakeDb(adata=self.adata, db_name=self.db_name, db_path=self.db_path)
+		adata_sql = AnnSQL.AnnSQL(db=self.db_file)
+		result = adata_sql.query("SELECT * FROM X")
+		if os.path.exists("data"): #tearDown here. 
+			os.remove("data/pbmc3k_processed.h5ad")
+			os.rmdir("data")
+		if os.path.exists(self.db_file): #tearDown here. 
 			os.remove(self.db_file)
 		self.assertEqual(len(result), self.adata.shape[0])