Cleanup / consolidate unit testing code (#4831)

- Move testing code out of helpers.py
- Create new file unit_test.py

InvenTree/part/test_api.py

@@ -18,9 +18,9 @@ import company.models
 import order.models
 from common.models import InvenTreeSetting
 from company.models import Company, SupplierPart
-from InvenTree.api_tester import InvenTreeAPITestCase
 from InvenTree.status_codes import (BuildStatus, PurchaseOrderStatus,
                                     StockStatus)
+from InvenTree.unit_test import InvenTreeAPITestCase
 from part.models import (BomItem, BomItemSubstitute, Part, PartCategory,
                          PartCategoryParameterTemplate, PartParameterTemplate,
                          PartRelated, PartStocktake)

InvenTree/part/test_bom_export.py

@@ -4,7 +4,7 @@ import csv
 
 from django.urls import reverse
 
-from InvenTree.helpers import InvenTreeTestCase
+from InvenTree.unit_test import InvenTreeTestCase
 
 
 class BomExportTest(InvenTreeTestCase):

InvenTree/part/test_bom_import.py

@@ -5,7 +5,7 @@ from django.urls import reverse
 
 import tablib
 
-from InvenTree.api_tester import InvenTreeAPITestCase
+from InvenTree.unit_test import InvenTreeAPITestCase
 from part.models import Part
 
 

InvenTree/part/test_migrations.py

@@ -2,14 +2,14 @@
 
 from django_test_migrations.contrib.unittest_case import MigratorTestCase
 
-from InvenTree import helpers
+from InvenTree import unit_test
 
 
 class TestForwardMigrations(MigratorTestCase):
     """Test entire schema migration sequence for the part app."""
 
-    migrate_from = ('part', helpers.getOldestMigrationFile('part'))
-    migrate_to = ('part', helpers.getNewestMigrationFile('part'))
+    migrate_from = ('part', unit_test.getOldestMigrationFile('part'))
+    migrate_to = ('part', unit_test.getNewestMigrationFile('part'))
 
     def prepare(self):
         """Create initial data."""
@@ -52,7 +52,7 @@ class TestBomItemMigrations(MigratorTestCase):
     """Tests for BomItem migrations"""
 
     migrate_from = ('part', '0002_auto_20190520_2204')
-    migrate_to = ('part', helpers.getNewestMigrationFile('part'))
+    migrate_to = ('part', unit_test.getNewestMigrationFile('part'))
 
     def prepare(self):
         """Create intial dataset"""

InvenTree/part/test_part.py

@@ -14,7 +14,7 @@ from common.models import (InvenTreeSetting, InvenTreeUserSetting,
                            NotificationEntry, NotificationMessage)
 from common.notifications import UIMessageNotification, storage
 from InvenTree import version
-from InvenTree.helpers import InvenTreeTestCase
+from InvenTree.unit_test import InvenTreeTestCase
 
 from .models import (Part, PartCategory, PartCategoryStar, PartRelated,
                      PartStar, PartStocktake, PartTestTemplate,

InvenTree/part/test_pricing.py

@@ -10,8 +10,8 @@ import company.models
 import order.models
 import part.models
 import stock.models
-from InvenTree.helpers import InvenTreeTestCase
 from InvenTree.status_codes import PurchaseOrderStatus
+from InvenTree.unit_test import InvenTreeTestCase
 
 
 class PartPricingTests(InvenTreeTestCase):

InvenTree/part/test_views.py

@@ -2,7 +2,7 @@
 
 from django.urls import reverse
 
-from InvenTree.helpers import InvenTreeTestCase
+from InvenTree.unit_test import InvenTreeTestCase
 
 from .models import Part