update descriptive test_error headers

pydar/pytests/test_error_display_image.py

@@ -1,5 +1,7 @@
-# Pytest for display_image.py
-# pydar/pydar/: pytest -vs --disable-pytest-warnings --show-capture=no --capture=sys -vv
+# Test Expected Error Messages from display_image.py
+# centerline-width/: python -m pytest -v
+# python -m pytest -k test_error_display_image.py -xv
+
 import re
 
 # External Python libraries (installed via pip install)

pydar/pytests/test_error_extract_flyby_parameters.py

@@ -1,5 +1,7 @@
-# Pytest for extract_flyby_parameters.py
-# pydar/pydar/: pytest -vs --disable-pytest-warnings --show-capture=no --capture=sys -vv
+# Test Expected Error Messages from extract_flyby_parameters.py
+# centerline-width/: python -m pytest -v
+# python -m pytest -k test_error_extract_flyby_parameters.py
+
 import re
 
 # External Python libraries (installed via pip install)

pydar/pytests/test_error_read_readme.py

@@ -1,5 +1,7 @@
-# Pytest for read_readme.py
-# pydar/pydar/: pytest -vs --disable-pytest-warnings --show-capture=no --capture=sys -vv
+# Test Expected Error Messages from read_readme.py
+# centerline-width/: python -m pytest -v
+# python -m pytest -k test_error_read_readme.py
+
 import logging
 import re
 

pydar/pytests/test_error_retrieve_ids_by_time_position.py

@@ -1,5 +1,7 @@
-# Pytest for retrieve_ids_by_time_position.pyc
-# pydar/pydar/: pytest -vs --disable-pytest-warnings --show-capture=no --capture=sys -vv
+# Test Expected Error Messages from retrieve_ids_by_time_position.py
+# centerline-width/: python -m pytest -v
+# python -m pytest -k test_error_retrieve_ids_by_time_position.py
+
 import logging
 import re