The result icon doesn't change in "Test" panel after run test on test method

[xiaofeng0123]

VS Code version: 1.39.0-insider
Python-insider:2019.10.38352-dev

Expected behaviour
The result icon should update when run test

Actual behaviour
The result icon doesn't update after run test on test method

Steps to reproduce:

1. Input below code:

import unittest
class PassingTests(unittest.TestCase):
    def test_passing(self):
        self.assertEqual(42, 42)
    def test_passing_still(self):
        self.assertEqual("silly walk", "silly walk")
class FailingTests(unittest.TestCase):
    def test_failure(self):
        self.assertEqual(42, -13)
    def test_failure_still(self):
        self.assertEqual("I'm right!", "no, I am!")

2. Select "unittest" as test framework
3. Click "Run Test" on a test method
4. The result icon is changed to
5. Do "Discover Tests" or "Run All Tests" or "Run Test" on method
6. Check the result icon

Repro movie:
test panel.zip

[ericsnowcurrently]

also see #7586

[ericsnowcurrently]

@xiaofeng0123, thanks for letting us know about this. We've been able to reproduce the problem and are going to investigate further.

[luabud]

Closing in favour of #7898