Add support for additional test data folder (CDL_DATA variable)

Author: PierreRaybaut

CHANGELOG.md

@@ -46,6 +46,8 @@ This release requires PlotPy v2.4.0 or later, which brings the following bug fix
 
 * When doing an operation which involves an object (signal or image) with higher order number than the current object (e.g. when subtracting an image with an image from a group below the current image), the resulting object's title now correctly refers to the order numbers of the objects involved in the operation (e.g., to continue with the subtraction example mentioned above, the resulting object's title was previously referring to the order number before the insertion of the resulting image)
 
+* Added support for additional test data folder thanks to the `CDL_DATA` environment variable (useful for testing purposes, and especially in the context of Debian packaging)
+
 ## DataLab Version 0.16.1 ##
 
 Since version 0.16.0, many validation functions have been added to the test suite.

cdl/tests/__init__.py

@@ -28,6 +28,10 @@
 from cdl.utils import qthelpers as qth
 from cdl.utils import tests
 
+# Add test data files and folders pointed by `CDL_DATA` environment variable:
+tests.add_test_path_from_env("CDL_DATA")
+
+
 # TODO: [P2] Documentation: add more screenshots from tests