test that yaml parsing does not accept provides

tests/metadata.TestCase

@@ -367,6 +367,24 @@ class MetadataTest(unittest.TestCase):
                                                   'prebuild': "a && b && "
                                                               "sed -i 's,a,b,'"}]})
 
+    def test_parse_yaml_provides_should_raise_exception(self):
+        mf = io.StringIO(textwrap.dedent("""\
+            Provides: this.is.deprecated
+            AutoName: F-Droid
+            RepoType: git
+            Builds:
+                - versionCode: 1
+                  versionName: v0.1.0
+                  prebuild: |-
+                    a && b && sed -i 's,a,b,'
+            """))
+        mf.name = 'mock_filename.yaml'
+        mf.seek(0)
+        result = {}
+        with mock.patch('fdroidserver.metadata.warnings_action', 'error'):
+            with self.assertRaises(fdroidserver.metadata.MetaDataException):
+                fdroidserver.metadata.parse_yaml_metadata(mf, result)
+
     def test_write_yaml_1_line_scripts_as_string(self):
         mf = io.StringIO()
         app = fdroidserver.metadata.App()