aruco_pose: implement test for TF_REPEATED_DATA when multiple markers with the same ID

aruco_pose/test/duplicate.py

@@ -0,0 +1,8 @@
+import pytest
+import subprocess
+
+def test_no_tf_repeated_data():
+    # `/rosout` acts weirdly inside rostest, so using a subprocess
+    cmd = """python -c 'import rospy, tf; rospy.init_node("foo"); listener = tf.TransformListener(); rospy.sleep(2)'"""
+    output = str(subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT))
+    assert 'TF_REPEATED_DATA' not in output, 'TF_REPEATED_DATA was logged on duplicate markers'