Start large refactoring of tests and project structure

* Put tests in tests/ diretory
* Write functional tests
* Create setup.py
* Put sources into django_migration_linter folder (for future PyPi publishing)

tests/functional/test_migration_linter.py

@@ -0,0 +1,79 @@
+# Copyright 2017 3YOURMIND GmbH
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+
+from django_migration_linter import MigrationLinter
+from tests import fixtures
+
+
+class BackwardcompatibilityDetectionTest(unittest.TestCase):
+    def setUp(self, *args, **kwargs):
+        return super(
+            BackwardcompatibilityDetectionTest, self).setUp(*args, **kwargs)
+
+    def test_create_table_with_not_null_column(self):
+        linter = MigrationLinter(
+            fixtures.CREATE_TABLE_WITH_NOT_NULL_COLUMN_PROJECT)
+        has_errors = linter.lint_migrations()
+        self.assertFalse(has_errors)
+
+    def test_detect_adding_not_null_column(self):
+        linter = MigrationLinter(
+            fixtures.ADD_NOT_NULL_COLUMN_PROJECT)
+        has_errors = linter.lint_migrations()
+        self.assertTrue(has_errors)
+
+    def test_detect_drop_column(self):
+        linter = MigrationLinter(
+            fixtures.DROP_COLUMN_PROJECT)
+        has_errors = linter.lint_migrations()
+        self.assertTrue(has_errors)
+
+    def test_detect_rename_column(self):
+        linter = MigrationLinter(
+            fixtures.RENAME_COLUMN_PROJECT)
+        has_errors = linter.lint_migrations()
+        self.assertTrue(has_errors)
+
+    def test_detect_rename_table(self):
+        linter = MigrationLinter(
+            fixtures.RENAME_TABLE_PROJECT)
+        has_errors = linter.lint_migrations()
+        self.assertTrue(has_errors)
+
+    def test_accept_not_null_column_followed_by_adding_default(self):
+        linter = MigrationLinter(
+            fixtures.ADD_NOT_NULL_COLUMN_FOLLOWED_BY_DEFAULT_PROJECT)
+        has_errors = linter.lint_migrations()
+        self.assertFalse(has_errors)
+
+    def test_specify_git_hash(self):
+        linter = MigrationLinter(
+            fixtures.MULTI_COMMIT_PROJECT,
+            commit_id=None)
+        has_errors = linter.lint_migrations()
+        self.assertTrue(has_errors)
+
+        linter = MigrationLinter(
+            fixtures.MULTI_COMMIT_PROJECT,
+            commit_id='44330921696018f8f1480df897b38310549982cb')
+        has_errors = linter.lint_migrations()
+        self.assertFalse(has_errors)
+
+        linter = MigrationLinter(
+            fixtures.MULTI_COMMIT_PROJECT,
+            commit_id='tag1')
+        has_errors = linter.lint_migrations()
+        self.assertFalse(has_errors)