Use centralized is_test_mode() from PyAutoFit

Replace direct os.environ PYAUTOFIT_TEST_MODE checks with the shared
is_test_mode() helper for consistency across the stack.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 2 people

autolens/analysis/analysis/dataset.py

@@ -31,6 +31,7 @@
 from autolens.analysis.positions import PositionsLH
 
 from autolens import exc
+from autofit.non_linear.test_mode import is_test_mode
 
 logger = logging.getLogger(__name__)
 
@@ -104,7 +105,7 @@ def __init__(
             raise_inversion_positions_likelihood_exception
         )
 
-        if os.environ.get("PYAUTOFIT_TEST_MODE") == "1":
+        if is_test_mode():
             self.raise_inversion_positions_likelihood_exception = False
 
         # Can be deleted after relevent AutoFIT PR merged

autolens/analysis/result.py

@@ -31,6 +31,7 @@
 )
 from autolens.lens.tracer import Tracer
 from autolens.point.solver import PointSolver
+from autofit.non_linear.test_mode import is_test_mode
 
 logger = logging.getLogger(__name__)
 
@@ -303,7 +304,7 @@ def positions_likelihood_from(
         The `PositionsLH` object used to apply a likelihood penalty or resample the positions.
         """
 
-        if os.environ.get("PYAUTOFIT_TEST_MODE") == "1":
+        if is_test_mode():
             return
 
         positions = (

autolens/quantity/model/visualizer.py

@@ -1,6 +1,7 @@
 import os
 
 import autofit as af
+from autofit.non_linear.test_mode import is_test_mode
 
 from autogalaxy.quantity.model.plotter import PlotterQuantity
 
@@ -39,7 +40,7 @@ def visualize(
             via a non-linear search).
         """
 
-        if os.environ.get("PYAUTOFIT_TEST_MODE") == "1":
+        if is_test_mode():
             return
 
         fit = analysis.fit_quantity_for_instance(instance=instance)