Running nose tests reports the wrong number of tests passing or failing.

[d3r3kk]

Environment data

• VS Code version: 1.31.1
• Extension version (available under the Extensions sidebar): 2019.2-RC (Also tested in 2019.1 where the behaviour is also exhibited)
• OS and version: Windows 10
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.7.2
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): venv
• Relevant/affected Python packages and their versions: nose==1.3.7

Expected behaviour

Test results report 1 pass and 1 fail.

Actual behaviour

Test results report 2 passes and no failures when the passing test is run.
Test results report 2 fails and no passes when the failing test is run.

---

Gif showing that running the test from code lens duplicates the test results

---

Steps to reproduce:

1. Create a workspace
2. Set up venv for the workspace in a Powershell window:
   • cd <workspace>
   • py -3.7 -m venv .venv
   • .venv/Scripts/Activate.ps1
   • python -m pip install -U pip
   • python -m pip install nose
3. Open VS Code and open the workspace folder you created.
4. Add a single file called test_nose.py to the workspace.
5. Add the following code to test_nose.py:

def test_passing():
    assert 42 == 42

def test_failure():
    assert 42 == -13

6. Click the Run Tests button in the status bar.
7. Click on the Run All Unit Tests in the command bar selection that pops up.
8. Note that the two test methods are marked with code-lens appropriated (test_passing is marked as passing, test_failure is marked as not passing).
9. Click on the Run Test of the test_passing code lens.
   • Note that 2 tests are reported as passing.
10. Click on the Run Test of the test_failure code lens.

• Note that 2 tests are reported as failing.

Logs from Python::Python Test Log

Logging from Python Run All Unit Tests

.F
======================================================================
FAIL: test_nose_tests.test_failure
----------------------------------------------------------------------
Traceback (most recent call last):
  File "c:\dev\github\d3r3kk\test\bugbash_feb_2019\.venv\lib\site-packages\nose\case.py", line 198, in runTest
    self.test(*self.arg)
  File "c:\dev\github\d3r3kk\test\bugbash_feb_2019\test_nose_tests.py", line 6, in test_failure
    assert 42 == -13
AssertionError

----------------------------------------------------------------------
Ran 2 tests in 0.005s

FAILED (failures=1)

Logging from Clicking the Run Test Code Lens of the passing test:

..
----------------------------------------------------------------------
Ran 2 tests in 0.001s

OK

Logging from Clicking the Run Test Code Lens of the failing test:

FF
======================================================================
FAIL: test_nose_tests.test_failure
----------------------------------------------------------------------
Traceback (most recent call last):
  File "c:\dev\github\d3r3kk\test\bugbash_feb_2019\.venv\lib\site-packages\nose\case.py", line 198, in runTest
    self.test(*self.arg)
  File "c:\dev\github\d3r3kk\test\bugbash_feb_2019\test_nose_tests.py", line 6, in test_failure
    assert 42 == -13
AssertionError

======================================================================
FAIL: test_nose_tests.test_failure
----------------------------------------------------------------------
Traceback (most recent call last):
  File "c:\dev\github\d3r3kk\test\bugbash_feb_2019\.venv\lib\site-packages\nose\case.py", line 198, in runTest
    self.test(*self.arg)
  File "c:\dev\github\d3r3kk\test\bugbash_feb_2019\test_nose_tests.py", line 6, in test_failure
    assert 42 == -13
AssertionError

----------------------------------------------------------------------
Ran 2 tests in 0.002s

FAILED (failures=2)

Output from Console under the Developer Tools panel

Not very interesting

console.ts:134 [Extension Host] Python Extension: Cached data exists ActivatedEnvironmentVariables, c:\dev\github\d3r3kk\test\bugbash_feb_2019
console.ts:134 [Extension Host] Python Extension: getActivatedEnvironmentVariables, Class name = b, Arg 1: <Uri:c:\dev\github\d3r3kk\test\bugbash_feb_2019>, Arg 2: undefined
console.ts:134 [Extension Host] Python Extension: Cached data exists ActivatedEnvironmentVariables, c:\dev\github\d3r3kk\test\bugbash_feb_2019
console.ts:134 [Extension Host] Python Extension: getActivatedEnvironmentVariables, Class name = b, Arg 1: <Uri:c:\dev\github\d3r3kk\test\bugbash_feb_2019>, Arg 2: undefined
console.ts:134 [Extension Host] Python Extension: Cached data exists ActivatedEnvironmentVariables, c:\dev\github\d3r3kk\test\bugbash_feb_2019
console.ts:134 [Extension Host] Python Extension: getActivatedEnvironmentVariables, Class name = b, Arg 1: <Uri:c:\dev\github\d3r3kk\test\bugbash_feb_2019>, Arg 2: undefined

[karthiknadig]

Closing via #16371