Fix database and gui init tests

tests/unit/database_test.py

@@ -13,7 +13,8 @@
 @pytest.mark.generate
 def test_generate():
     sys.argv.extend(('generate', '--fast', '--minimal'))
-    runpy.run_path('../desktop_shop/database.py', run_name='__main__')
+    path = os.path.join(os.path.dirname(__file__), '..', '..', 'desktop_shop', 'database.py')
+    runpy.run_path(path)
 
 def teardown():
     while len(sys.argv) > 1:

tests/unit/gui/init_test.py

@@ -4,19 +4,29 @@
 import sys
 from collections import namedtuple
 
-import desktop_shop.gui.init as init
-import desktop_shop.server as server
+from desktop_shop import server, database
 import pytest
-from desktop_shop import gui
-from desktop_shop.gui.views import views
 
 Product = namedtuple("Product", ["id", "name", "price"])
 
 
-def test_gui_init():
+def test_gui_init(monkeypatch):
     if sys.platform.startswith('linux') and os.environ.get('DISPLAY') is None: # FIXME
         pytest.skip('Tkinter cannot be initialised on headless server')
 
+    from desktop_shop import gui
+    from desktop_shop.gui import init
+    from desktop_shop.gui.views import views
+
+    Product = namedtuple("Product", ["id", "name", "price"])
+    def fake_products_query(*_, **__):
+        return [
+            Product(0, "a", 1000),
+            Product(1, "b", 1000),
+            Product(2, "c", 1000),
+        ]
+
+    monkeypatch.setattr(database, "query_product_data_from_product_table", fake_products_query)
     init.init()
     for view in gui.app.views_dict.values():
         view.pack()
@@ -26,6 +36,8 @@ def test_checkout_view():
     if sys.platform.startswith('linux') and os.environ.get('DISPLAY') is None: # FIXME
         pytest.skip('Tkinter cannot be initialised on headless server')
 
+    from desktop_shop import gui
+
     class MonkeyPatch:
         def __enter__(self):
             self.func = server.query_product_data_from_product_table_by_product_ids