Fix AppLauncher tests: update newton alias and remove legacy headless CLI test

[ChaitanyaParate]

This PR isolates and fixes the failing tests in test_kwarg_launch.py that surfaced during the investigation of #7403 (and the closed PR #7444).

When run on a clean upstream/develop, test_kwarg_launch.py fails on exactly four tests. This PR addresses them:

1. Newton Alias Fallout: Fixed three tests (test_parse_visualizer_csv_accepts_comma_delimited_values, test_visualizer_csv_does_not_swallow_hydra_overrides, and test_matrix_cli_kit_newton_with_custom_kit_cfg_intent_non_headless) which were failing because they asserted against the deprecated newton alias instead of newton_gl. The third test was explicitly renamed to test_matrix_cli_kit_newton_gl_with_custom_kit_cfg_intent_non_headless to reflect the updated assertion.
2. Removed Dead CLI Path: Deleted test_matrix_headless_with_viz_names_takes_precedence. This test was failing because it passed headless=True directly through _resolve_visualizer_settings, simulating the --headless CLI flag which was removed in 3.0 and is no longer supported upstream.
3. Hygiene Updates (Not Failing):
   • Replaced "kit, newton" with "kit, newton_gl" in test_parse_visualizer_csv_rejects_spaces_between_entries. This test successfully raises an ArgumentTypeError before checking aliases so it wasn't failing, but it was updated to prevent stale strings from persisting.
   • Renamed test_matrix_no_cli_with_cfg_kit_newton_non_headless to test_matrix_no_cli_with_cfg_kit_newton_gl_non_headless for naming consistency. This test also passed previously but carried the stale alias in its name.

See the attached pytest_before_fix.txt (showing the 4 failures on develop) and pytest_after_fix.txt (showing 47 clean passes) for the exact run logs.

pytest_after_fix.txt
pytest_before_fix.txt

Release backport

• Backport this pull request to the active release branch after it merges into develop

[isaaclab-review-bot]

Isaac Lab Review Bot

This test-only change updates visualizer cases from the deprecated newton alias to newton_gl and removes one legacy combined headless/visualizer test. No production behavior is modified.

• Design and architecture: The parsing, Hydra passthrough, and headless-resolution test paths remain aligned with the current visualizer naming. The change does not alter AppLauncher architecture or responsibility boundaries.
• API: No public or extension-facing API is changed. Existing AppLauncher parsing and resolution methods are exercised with updated test inputs but are not redefined.
• Implementation: The changed assertions consistently match the updated newton_gl inputs. Removing the combined deprecated-headless/visualizer case reduces coverage of that specific interaction, but the retained deprecated-headless precedence test continues to cover the legacy argument path, and the patch supplies no evidence that the removed combination remains supported.

No blocking issues. No inline issue met the actionable-evidence threshold; the assessment above records the review feedback.

Automated review; human maintainers own approval decisions.

[greptile-apps]

Greptile Summary

Updates AppLauncher tests to use the canonical newton_gl visualizer name and removes an obsolete test for the retired headless CLI path.

• Replaces stale newton test inputs and expectations with newton_gl.
• Renames matrix tests for consistency with the canonical alias.
• Deletes the legacy headless-plus-visualizer precedence test.

Confidence Score: 5/5

The PR appears safe to merge because the test updates match the current AppLauncher visualizer contract and introduce no production behavior changes.

The canonical newton_gl value is supported by the parser and resolver, deprecated newton compatibility remains covered elsewhere, and the removed test asserted obsolete behavior.

Important Files Changed

Filename	Overview
source/isaaclab/test/app/test_kwarg_launch.py	Test-only updates align visualizer assertions with the canonical alias and remove a stale test for unsupported legacy CLI behavior.

_{Reviews (1): Last reviewed commit: "Fix AppLauncher tests: update newton ali..." | Re-trigger Greptile}

[kellyguo11]

run-ci

[kellyguo11]

run-ci

[isaaclab-bot]

Backported to release/3.0.0 as 1d072ba.