Support apps with custom label.

tests/fixtures.py

@@ -19,3 +19,5 @@ DATA_MIGRATIONS = "app_data_migrations"
 MAKE_NOT_NULL_WITH_DJANGO_DEFAULT = "app_make_not_null_with_django_default"
 MAKE_NOT_NULL_WITH_LIB_DEFAULT = "app_make_not_null_with_lib_default"
 CREATE_INDEX_EXCLUSIVE = "app_create_index_exclusive"
+CUSTOM_APP_NAME_DIRECTORY = "app_with_custom_name"
+CUSTOM_APP_LABEL = "my_custom_name"

tests/functional/test_migration_linter.py

@@ -34,22 +34,32 @@ class BaseBackwardCompatibilityDetection:
         linter = self._launch_linter(app, commit_id)
         self.assertTrue(linter.has_errors)
         self.assertNotEqual(linter.nb_valid + linter.nb_erroneous, 0)
+        self.assertGreater(linter.nb_total, 0)
 
     def _test_linter_finds_no_errors(self, app=None, commit_id=None):
         linter = self._launch_linter(app, commit_id)
         self.assertFalse(linter.has_errors)
         self.assertNotEqual(linter.nb_valid + linter.nb_erroneous, 0)
+        self.assertGreater(linter.nb_total, 0)
+
+    def _test_linter_linted_no_migration(self, app=None, commit_id=None):
+        linter = self._launch_linter(app, commit_id)
+        self.assertEqual(linter.nb_valid, 0)
+        self.assertEqual(linter.nb_erroneous, 0)
+        self.assertEqual(linter.nb_total, 0)
 
     def _launch_linter(self, app=None, commit_id=None):
-        linter = MigrationLinter(
+        linter = self._get_linter()
+        linter.lint_all_migrations(app_label=app, git_commit_id=commit_id)
+        return linter
+
+    def _get_linter(self):
+        return MigrationLinter(
             self.test_project_path,
             database=self.database,
             no_cache=True,
         )
-        linter.lint_all_migrations(app_label=app, git_commit_id=commit_id)
-        return linter
 
-    # *** Tests ***
     def test_create_table_with_not_null_column(self):
         app = fixtures.CREATE_TABLE_WITH_NOT_NULL_COLUMN
         self._test_linter_finds_no_errors(app)
@@ -121,6 +131,22 @@ class BaseBackwardCompatibilityDetection:
         with self.assertRaises(ValueError):
             linter.get_sql("app_unique_together", "0003")
 
+    def test_custom_named_app(self):
+        # Folder name is not found.
+        app = fixtures.CUSTOM_APP_NAME_DIRECTORY
+        self._test_linter_linted_no_migration(app)
+
+        # Django app name is found.
+        app = fixtures.CUSTOM_APP_LABEL
+        self._test_linter_finds_no_errors(app)
+
+        # And with git ref:
+        app = fixtures.CUSTOM_APP_NAME_DIRECTORY
+        self._test_linter_linted_no_migration(app, commit_id="v0.1.4")
+
+        app = fixtures.CUSTOM_APP_LABEL
+        self._test_linter_finds_no_errors(app, commit_id="v0.1.4")
+
 
 class SqliteBackwardCompatibilityDetectionTestCase(
     BaseBackwardCompatibilityDetection, unittest.TestCase

tests/test_project/app_with_custom_name/apps.py

@@ -0,0 +1,8 @@
+from __future__ import annotations
+
+from django.apps import AppConfig
+
+
+class DefaultConfig(AppConfig):
+    name = "tests.test_project.app_with_custom_name"
+    label = "my_custom_name"

tests/test_project/app_with_custom_name/migrations/0001_initial.py

@@ -0,0 +1,30 @@
+# Generated by Django 2.2 on 2019-07-29 21:21
+
+from __future__ import annotations
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = []
+
+    operations = [
+        migrations.CreateModel(
+            name="A",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("int_field", models.IntegerField()),
+                ("char_field", models.CharField(max_length=255)),
+            ],
+        )
+    ]

tests/test_project/app_with_custom_name/models.py

@@ -0,0 +1,8 @@
+from __future__ import annotations
+
+from django.db import models
+
+
+class A(models.Model):
+    int_field = models.IntegerField()
+    char_field = models.CharField(max_length=255)

tests/test_project/settings.py

@@ -59,6 +59,7 @@ INSTALLED_APPS = [
     "tests.test_project.app_make_not_null_with_django_default",
     "tests.test_project.app_make_not_null_with_lib_default",
     "tests.test_project.app_create_index_exclusive",
+    "tests.test_project.app_with_custom_name.apps.DefaultConfig",
 ]
 
 if django.VERSION[0] >= 5: