test: change how we keep mismatched actual output

Now when a goldtest has a failure, the actual mismatched output will be written
to the tests/actual directory.

Along the way, I removed some obsolete settings which were only used by unittest
and unittest_mixins, which we no longer use:

- COVERAGE_KEEP_TMP
- COVERAGE_ENV_ID
- $TMPDIR/coverage_test

1 files changed, 0 insertions, 3 deletions

diff --git a/igor.py b/igor.py
index c31d21b3..9db90f89 100644
--- a/igor.py
+++ b/igor.py
@@ -124,9 +124,6 @@ def run_tests(tracer, *runner_args):
     """The actual running of tests."""
     if 'COVERAGE_TESTING' not in os.environ:
         os.environ['COVERAGE_TESTING'] = "True"
-    # $set_env.py: COVERAGE_ENV_ID - Use environment-specific test directories.
-    if 'COVERAGE_ENV_ID' in os.environ:
-        os.environ['COVERAGE_ENV_ID'] = make_env_id(tracer)
     print_banner(label_for_tracer(tracer))
 
     return pytest.main(list(runner_args))