diff --git a/tests/unit/remote/test_s3.py b/tests/unit/remote/test_s3.py
new file mode 100644
index 000000000..53e96b1b6
--- /dev/null
+++ b/tests/unit/remote/test_s3.py
@@ -0,0 +1,40 @@
+from unittest import TestCase
+
+from dvc.remote.s3 import RemoteS3
+
+
+class TestRemoteS3(TestCase):
+    bucket_name = "bucket-name"
+    prefix = "some/prefix"
+    url = "s3://{}/{}".format(bucket_name, prefix)
+
+    def test_init(self):
+        config = {"url": self.url}
+        remote = RemoteS3(None, config)
+
+        self.assertEqual(remote.path_info, self.url)
+
+    def test_grants(self):
+        config = {
+            "url": self.url,
+            "grant_read": "id=read-permission-id,id=other-read-permission-id",
+            "grant_read_acp": "id=read-acp-permission-id",
+            "grant_write_acp": "id=write-acp-permission-id",
+            "grant_full_control": "id=full-control-permission-id",
+        }
+        remote = RemoteS3(None, config)
+
+        self.assertEqual(
+            remote.extra_args["GrantRead"],
+            "id=read-permission-id,id=other-read-permission-id",
+        )
+        self.assertEqual(
+            remote.extra_args["GrantReadACP"], "id=read-acp-permission-id"
+        )
+        self.assertEqual(
+            remote.extra_args["GrantWriteACP"], "id=write-acp-permission-id"
+        )
+        self.assertEqual(
+            remote.extra_args["GrantFullControl"],
+            "id=full-control-permission-id",
+        )