run-tests: sort the skip, failure and error lists in the final output

This will help keep the lists consistent, for comparison across runs.

tests/run-tests.py

@@ -2258,14 +2258,17 b' class TextTestRunner(unittest.TextTestRu'
             self.stream.writeln('')
 
             if not self._runner.options.noskips:
-                for test, msg in self._result.skipped:
+                for test, msg in sorted(self._result.skipped,
+                                        key=lambda s: s[0].name):
                     formatted = 'Skipped %s: %s\n' % (test.name, msg)
                     msg = highlightmsg(formatted, self._result.color)
                     self.stream.write(msg)
-            for test, msg in self._result.failures:
+            for test, msg in sorted(self._result.failures,
+                                    key=lambda f: f[0].name):
                 formatted = 'Failed %s: %s\n' % (test.name, msg)
                 self.stream.write(highlightmsg(formatted, self._result.color))
-            for test, msg in self._result.errors:
+            for test, msg in sorted(self._result.errors,
+                                    key=lambda e: e[0].name):
                 self.stream.writeln('Errored %s: %s' % (test.name, msg))
 
             if self._runner.options.xunit:

tests/test-run-tests.t

@@ -324,8 +324,8 b' basic failing test'
   
   ERROR: test-failure-unicode.t output changed
   !
+  Failed test-failure-unicode.t: output changed
   Failed test-failure.t: output changed
-  Failed test-failure-unicode.t: output changed
   # Ran 3 tests, 0 skipped, 2 failed.
   python hash seed: * (glob)
   [1]
@@ -356,8 +356,8 b' test --outputdir'
   
   ERROR: test-failure-unicode.t output changed
   !
+  Failed test-failure-unicode.t: output changed
   Failed test-failure.t: output changed
-  Failed test-failure-unicode.t: output changed
   # Ran 3 tests, 0 skipped, 2 failed.
   python hash seed: * (glob)
   [1]
@@ -393,8 +393,8 b' test --xunit support'
   
   ERROR: test-failure-unicode.t output changed
   !
+  Failed test-failure-unicode.t: output changed
   Failed test-failure.t: output changed
-  Failed test-failure-unicode.t: output changed
   # Ran 3 tests, 0 skipped, 2 failed.
   python hash seed: * (glob)
   [1]