Do some minor coverage pumping (add a test for the SQLAlchemy dburl conversion), remove the CSV FDW from coverage (is tested inside of the engine)

Author: mildbyte

.coveragerc

@@ -1,6 +1,6 @@
 [report]
 # Tested inside of the actual engine
-omit = splitgraph/core/fdw_checkout.py,splitgraph/core/server.py
+omit = splitgraph/core/fdw_checkout.py,splitgraph/core/server.py,splitgraph/ingestion/csv/fdw.py
 
 # Regexes for lines to exclude from consideration
 exclude_lines =

test/splitgraph/ingestion/test_snowflake.py

@@ -0,0 +1,48 @@
+from unittest.mock import Mock
+
+from splitgraph.ingestion.snowflake import SnowflakeDataSource
+
+
+def test_snowflake_data_source_dburl_conversion():
+    source = SnowflakeDataSource(
+        Mock(),
+        credentials={
+            "username": "username",
+            "password": "password",
+            "account": "abcdef.eu-west-1.aws",
+        },
+        params={
+            "database": "SOME_DB",
+            "schema": "TPCH_SF100",
+            "warehouse": "my_warehouse",
+            "role": "role",
+        },
+    )
+
+    assert source.get_server_options() == {
+        "db_url": "snowflake://username:[email protected]/SOME_DB/TPCH_SF100warehouse=my_warehouse&role=role",
+        "wrapper": "multicorn.sqlalchemyfdw.SqlAlchemyFdw",
+    }
+
+    source = SnowflakeDataSource(
+        Mock(),
+        credentials={
+            "username": "username",
+            "password": "password",
+            "account": "abcdef.eu-west-1.aws",
+        },
+        params={
+            "database": "SOME_DB",
+            "tables": {
+                "test_table": {
+                    "schema": {"col_1": "int", "col_2": "varchar"},
+                    "options": {"subquery": "SELECT col_1, col_2 FROM other_table"},
+                }
+            },
+        },
+    )
+
+    assert source.get_table_options("test_table") == {
+        "subquery": "SELECT col_1, col_2 FROM other_table",
+        "tablename": "test_table",
+    }