Run a systematic test: ISAALTITUDE function in AirDC Library

[JLJu]

Run a systematic test: ISAALTITUDE function in AirDC Library
It is necessary to develop a test function that can test the correctness of the ISAALTITUDE implementation. The test function will compare the ISAALTITUDE output with the expected output for a set of input data. If the differences are within 1/1000, then ISAALTITUDE function passes the test.