Include require statements
Get current list of sounding stations

Calling the ‘df_soundings’ function with no arguments
Include test data for necessary query parameters
Make request for NOAA data using mock data inputs
Parse return message from web server and construct URI string
Get the plaintext data using ‘getURL’ function
Write the sounding data to a file, separating lines
Read back the sounding data as separate lines
Verify the linetype of each line of sounding data
Read sounding data using the ‘read.table’ function
If line is a header, read data as that type