Raise NotFoundError if no daily build can be found for latest build d…

…ate (#672)

mozdownload/scraper.py

@@ -451,6 +451,8 @@ def get_latest_build_date(self):
                           months.entries[-1] + '/')
             parser = self._create_directory_parser(url)
             parser.entries = parser.filter(r'.*%s' % self.platform_regex)
+            if not parser.entries:
+                raise errors.NotFoundError('No builds have been found', url)
             parser.entries.sort()
 
             date = ''.join(parser.entries[-1].split('-')[:6])

tests/daily_scraper/test_invalid_platform.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import pytest
+
+from mozdownload import DailyScraper
+import mozdownload.errors as errors
+
+@pytest.mark.parametrize('args', [
+    ({'application': 'fenix', 'platform': 'mac'}),
+])
+def test_invalid_platform(httpd, tmpdir, args):
+    """Testing download scenarios with invalid platform parameters for DailyScraper"""
+
+    with pytest.raises(errors.NotFoundError):
+        DailyScraper(destination=str(tmpdir), base_url=httpd.get_url(), **args)