Fix local variable 'xml_content' referenced before assignment

Author: munkyu

tests/testsuite.py

@@ -575,6 +575,15 @@ def test_xmlrunner_stream(self):
         suite.addTest(self.DummyTest('test_pass'))
         runner.run(suite)
 
+    def test_xmlrunner_stream_empty_testsuite(self):
+        stream = self.stream
+        output = BytesIO()
+        runner = xmlrunner.XMLTestRunner(
+            stream=stream, output=output, verbosity=self.verbosity,
+            **self.runner_kwargs)
+        suite = unittest.TestSuite()
+        runner.run(suite)
+
     def test_xmlrunner_output_subdir(self):
         stream = self.stream
         output = os.path.join(self.outdir, 'subdir')

xmlrunner/result.py

@@ -605,12 +605,12 @@ def generate_reports(self, test_runner):
             testsuite = _XMLTestResult._report_testsuite(
                 suite_name, tests, doc, parentElement, self.properties
             )
-            xml_content = doc.toprettyxml(
-                indent='\t',
-                encoding=test_runner.encoding
-            )
 
             if outputHandledAsString:
+                xml_content = doc.toprettyxml(
+                    indent='\t',
+                    encoding=test_runner.encoding
+                )
                 filename = path.join(
                     test_runner.output,
                     'TEST-%s.xml' % suite_name)
@@ -621,6 +621,10 @@ def generate_reports(self, test_runner):
 
         if not outputHandledAsString:
             # Assume that test_runner.output is a stream
+            xml_content = doc.toprettyxml(
+                indent='\t',
+                encoding=test_runner.encoding
+            )
             test_runner.output.write(xml_content)
 
     def _exc_info_to_string(self, err, test):