Write a python script which does the following:

1. Takes in a command argument the location of a YAML file

2. Reads the YAML file which contains a fruits and vegetables and their respective counts

3. Print to the console:

a. Total number of fruits

b. Total number of vegetables

c. Which fruit has the median value

d. Which vegetable has the median value

To do this, I want you to create the following methods/functions:

1. Reads a YAML file and returns a dictionary of fruits and dictionary of vegetables

2. Counts the values in a dictionary

3. Finds the median within a dictionary

4. Prints the console output in a single line

In addition to this script, I want you to create unit test using pytest and/or unittest which tests:

1. The passed in file is a YAML file

2. The YAML file contains a dictionary of fruits and vegetables

3. Create test for each method above

a. Example: for counts the values in a dictionary, test that the dictionary has string keys and integer values. Also that it calculates the count properly

Please explain the code thouroughly and how you implemented it.