TST: make test the same with all Meson versions and avoid a warning

Author: dnicolodi

tests/packages/subproject/pyproject.toml

@@ -8,10 +8,7 @@ requires = ['meson-python']
 
 [tool.meson-python.wheel]
 exclude = [
-    # Meson before version 1.3.0 install data files in
-    # ``{datadir}/{project name}/``, later versions install
-    # in the more correct ``{datadir}/{subproject name}/``.
-    '{datadir}/*/data.txt',
+    '{datadir}/dep/*.txt',
     '{py_purelib}/dep.*',
 ]
 include = [

tests/packages/subproject/subprojects/dep/meson.build

@@ -6,6 +6,15 @@ project('dep')
 
 py = import('python').find_installation()
 
-py.install_sources('dep.py')
+py.install_sources(
+    'dep.py',
+)
 
-install_data('data.txt')
+install_data(
+    'data.txt',
+    # Prior to meson 1.3.0, the default install path for subproject data files
+    # is ``{datadir}/{main-project-name}/``. In later versions it is the more
+    # correct ``{datadir}/{subproject-name}/``. Specify the install path to
+    # obtain uniform behavior across different meson versions.
+    install_dir: '{datadir}' / meson.project_name(),
+)