Add s3 auth test

tests/s3_auth_test.py

@@ -0,0 +1,29 @@
+from s3.test_utils.base_test import S3BaseTest
+
+
+class AuthorizationTest(S3BaseTest):
+    """
+    Check connect to S3 via pre_start_checks() function
+    calling pg_probackup init --s3
+
+    test that s3 keys allow to connect to all types of storages
+    """
+
+    def test_s3_authorisation(self):
+        console_output = self.pb.init(options=["--log-level-console=VERBOSE"])
+
+        self.assertNotIn(': 403', console_output)  # Because we can have just '403' substring in timestamp
+        self.assertMessage(console_output, contains='S3_pre_start_check successful')
+        self.assertMessage(console_output, contains='HTTP response: 200')
+        self.assertIn(
+            f"INFO: Backup catalog '{self.backup_dir}' successfully initialized",
+            console_output)
+
+    def test_log_level_file_requires_log_directory(self):
+        console_output = self.pb.init(options=["--log-level-file=VERBOSE"],
+                                      skip_log_directory=True,
+                                      expect_error=True)
+
+        self.assertMessage(console_output,
+                           contains='ERROR: Cannot save S3 logs to a file. You must specify --log-directory option when'
+                                    ' running backup with --log-level-file option enabled')