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diff --git a/addons/web/tests/test_image.py b/addons/web/tests/test_image.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import io
+import base64
+
+from PIL import Image
+
+from odoo.tests.common import HttpCase, tagged
+
+
+@tagged('-at_install', 'post_install')
+class TestImage(HttpCase):
+    def test_01_content_image_resize_placeholder(self):
+        """The goal of this test is to make sure the placeholder image is
+        resized appropriately depending on the given URL parameters."""
+
+        # CASE: resize placeholder, given size but original ratio is always kept
+        response = self.url_open('/web/image/0/200x150')
+        image = Image.open(io.BytesIO(response.content))
+        self.assertEqual(image.size, (150, 150))
+
+        # CASE: resize placeholder to 128
+        response = self.url_open('/web/image/fake/0/image_128')
+        image = Image.open(io.BytesIO(response.content))
+        self.assertEqual(image.size, (128, 128))
+
+        # CASE: resize placeholder to 256
+        response = self.url_open('/web/image/fake/0/image_256')
+        image = Image.open(io.BytesIO(response.content))
+        self.assertEqual(image.size, (256, 256))
+
+        # CASE: resize placeholder to 1024 (but placeholder image is too small)
+        response = self.url_open('/web/image/fake/0/image_1024')
+        image = Image.open(io.BytesIO(response.content))
+        self.assertEqual(image.size, (256, 256))
+
+        # CASE: no size found, use placeholder original size
+        response = self.url_open('/web/image/fake/0/image_no_size')
+        image = Image.open(io.BytesIO(response.content))
+        self.assertEqual(image.size, (256, 256))
+
+    def test_02_content_image_Etag_304(self):
+        """This test makes sure that the 304 response is properly returned if the ETag is properly set"""
+
+        attachment = self.env['ir.attachment'].create({
+            'datas': b"R0lGODdhAQABAIAAAP///////ywAAAAAAQABAAACAkQBADs=",
+            'name': 'testEtag.gif',
+            'public': True,
+            'mimetype': 'image/gif',
+        })
+        response = self.url_open('/web/image/%s' % attachment.id, timeout=None)
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(base64.b64encode(response.content), attachment.datas)
+
+        etag = response.headers.get('ETag')
+
+        response2 = self.url_open('/web/image/%s' % attachment.id, headers={"If-None-Match": etag})
+        self.assertEqual(response2.status_code, 304)
+        self.assertEqual(len(response2.content), 0)