An error "Failed to launch debug..." pops up when debug unit test.

[linette-zyy]

Environment

Steps to Reproduce

1. Create a new python project, right-click project, select Add > New Item …, then select "Python Unit Test" followed by "Add"

2. Enabled unittest

3. Set breakpoints in the test which you want to debug
   

4. In TE, select the test and right-click to select Debug Selected tests

5. Check that breakpoints are hit
   Expected behavior
   The breakpoints are hit

Additional context and screenshots
An error pops up.

[StellaHuang95]

@linette-zyy This is working for me in the latest version. It seems similar to the other formatter issue where PTVS might not detect a valid interpreter or environment. Could you please try again with the correct Python environment being selected and configured, and see if it repros?

[linette-zyy]

@StellaHuang95 I verify this issue on today's build.

It is not repro. It can hit the breakpoints