new: dev: test api on empty database

tests/test_server.py

@@ -18,10 +18,28 @@ def test_cli(args, word):
     assert word in result.output
 
 
-def test_home(tmp_path):
+@pytest.fixture
+def client(tmp_path):
     test_db = tmp_path / 'test.db'
     app = server.create_app(test_db.as_posix())
     client = app.test_client()
+    return client
+
+
+def test_home(client):
     rd = client.get('/')
     assert rd.status_code == 200
     assert not flask.g.bukudb.get_rec_all()
+
+
+@pytest.mark.parametrize(
+    'url, exp_res', [
+        ['/api/tags', {'tags': []}],
+        ['/api/bookmarks', {'bookmarks': []}],
+        ['/api/bookmarks/search', {'bookmarks': []}]
+    ]
+)
+def test_api_empty_db(client, url, exp_res):
+    rd = client.get(url)
+    assert rd.status_code == 200
+    assert rd.get_json() == exp_res