[MIG] attachment_preview: Migration to 11.0

[FIX] Lint

[FIX] lint and flake

[ADD] tests

[ADD] tests

[ADD] tests

[ADD] Tests

[ADD] Package python-magic

[ADD] Tests

[FIX] Lint

attachment_preview/tests/test_attachment_preview.py

@@ -0,0 +1,46 @@
+# Copyright 2018 Onestein
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+import base64
+from odoo.tests.common import TransactionCase
+
+
+class TestAttachmentPreview(TransactionCase):
+    def test_get_extension(self):
+        attachment = self.env['ir.attachment'].create({
+            'datas': base64.b64encode(b'from this, to that.'),
+            'name': 'doc.txt',
+            'datas_fname': 'doc.txt'
+        })
+        attachment2 = self.env['ir.attachment'].create({
+            'datas': base64.b64encode(b'Png'),
+            'name': 'image.png',
+            'datas_fname': 'image.png'
+        })
+        res = self.env['ir.attachment'].get_attachment_extension(
+            attachment.id
+        )
+        self.assertEqual(res, 'txt')
+
+        res = self.env['ir.attachment'].get_attachment_extension(
+            [attachment.id, attachment2.id]
+        )
+        self.assertEqual(res[attachment.id], 'txt')
+        self.assertEqual(res[attachment2.id], 'png')
+
+        res2 = self.env['ir.attachment'].get_binary_extension(
+            'ir.attachment',
+            attachment.id,
+            'datas'
+        )
+        self.assertTrue(res2)
+
+        module = self.env['ir.module.module'].search([]).filtered(
+            lambda m: m.icon_image
+        )[0]
+        res3 = self.env['ir.attachment'].get_binary_extension(
+            'ir.module.module',
+            module.id,
+            'icon_image'
+        )
+        self.assertTrue(res3)