test that write yaml does not write provides

tests/metadata.TestCase

@@ -539,6 +539,34 @@ class MetadataTest(unittest.TestCase):
             UpdateCheckMode: None
             """))
 
+    def test_write_yaml_make_sure_provides_does_not_get_written(self):
+        mf = io.StringIO()
+        app = fdroidserver.metadata.App()
+        app.Categories = ['None']
+        app.Provides = 'this.is.deprecated'
+        app.builds = []
+        build = fdroidserver.metadata.Build()
+        build.versionCode = 102030
+        build.versionName = 'v1.2.3'
+        build.gradle = ['yes']
+        app.builds.append(build)
+        fdroidserver.metadata.write_yaml(mf, app)
+        mf.seek(0)
+        self.assertEqual(mf.read(), textwrap.dedent("""\
+            Categories:
+              - None
+            License: Unknown
+
+            Builds:
+              - versionName: v1.2.3
+                versionCode: 102030
+                gradle:
+                  - yes
+
+            AutoUpdateMode: None
+            UpdateCheckMode: None
+            """))
+
 
 if __name__ == "__main__":
     os.chdir(os.path.dirname(__file__))