Make test-module use default value for interpreter (#54053)

* Make test-module use default value for interpreter

* Changing from static interpreter path to sys.executable as per #54053

* A little ntegration test for #54053

hacking/test-module

@@ -64,7 +64,8 @@ def parse():
         help="path to python debugger (e.g. /usr/bin/pdb)")
     parser.add_option('-I', '--interpreter', dest='interpreter',
         help="path to interpreter to use for this module (e.g. ansible_python_interpreter=/usr/bin/python)",
-        metavar='INTERPRETER_TYPE=INTERPRETER_PATH')
+        metavar='INTERPRETER_TYPE=INTERPRETER_PATH',
+        default="ansible_python_interpreter=%s" % (sys.executable if sys.executable else '/usr/bin/python'))
     parser.add_option('-c', '--check', dest='check', action='store_true',
         help="run the module in check mode")
     parser.add_option('-n', '--noexecute', dest='execute', action='store_false',

test/integration/targets/test_infra/runme.sh

@@ -24,8 +24,12 @@ echo "$PB_OUT" | grep -F "assert works (True)" || exit 1
 
 set -e
 
-# ensure test-module script works well
 PING_MODULE_PATH="../../../../lib/ansible/modules/system/ping.py"
+
+# ensure test-module script works without passing Python interpreter path
+../../../../hacking/test-module -m "$PING_MODULE_PATH"
+
+# ensure test-module script works well
 ../../../../hacking/test-module -m "$PING_MODULE_PATH" -I ansible_python_interpreter="$(which python)"
 
 # ensure module.ansible_version is defined when using test-module