robotframework How robot framework is used in Automation testing in Embedded Systems? Remote Power Supply Testing
Example
Remote Power supply simulation
Since we don't have a real remote power supply hardware, we are going to simulate it using python program.
Basic idea about RPS
- Actually remote power supply has a http server.
- User can send commands to turn ON/OFF power supply using http request.
We are going to simulate remote power supply using following program rps-server.py.
from flask import Flask, request
from flask_httpauth import HTTPBasicAuth
app = Flask(__name__)
auth = HTTPBasicAuth()
users = {
'admin': '12345678'
}
app.url_map.strict_slashes = False
PINS = ['P60', 'P61', 'P62', 'P63']
PINS_STATUS = {'P60':'0', 'P61': '0', 'P62':'0', 'P63':'0'}
@auth.get_password
def get_pw(username):
if username in users:
return users.get(username)
return None
@app.route('/')
@auth.login_required
def index():
return "Hello, %s!" % auth.username()
def get_html_string():
html_str = '<html>P60={}P61={}P62={}P63={}</html>'.format(PINS_STATUS['P60'],
PINS_STATUS['P61'],
PINS_STATUS['P62'],
PINS_STATUS['P63'])
return html_str
def parse_cmd_args(args):
global current_status
if str(args['CMD']) == 'SetPower':
for key in args:
if key in PINS:
PINS_STATUS[key] = str(args[key])
return get_html_string()
if str(args['CMD']) == 'GetPower':
return get_html_string()
@app.route('/SetCmd', methods=['GET','POST'])
def rps():
if request.method=="GET":
args=request.args.to_dict()
ret = parse_cmd_args(args)
return ret
The above code actually simulates http server to control the remote power supply.
How to Run RPS server ?
$ export FLASK_APP=rps-server.py
$ flask run
How to send commands to rps server ?
Following are the two commands used to control the RPS
- SetPower
- GetPower
By default the server will be listening at the port 5000.
The power supply ports are,
- P60
- P61
- P62
- P64
The states of the ports are,
- ON - 1
- OFF - 0
Requirements
Requirements for building a remote power supply are
- Remote power supply should be able to turn ON/OFF remotely
- Remote power supply status can be accessed remotely.
Deriving test cases
Test cases derived from requirement
- Turn on Power supply 2 remotely.
- Verify power supply 2 is on.
- Turn off Power supply 2 remotely.
- Verify power supply 2 is off.
Manual Testing
- Run the rps server.
- To turn on Port 3, open a browser and give following URI
http://admin:12345678@localhost:5000/SetCmd?CMD=SetPower&P62=1
- To get the status of all the ports
http://admin:12345678@localhost:5000/SetCmd?CMD=GetPower
Writing test library
We need to write a test library in python for sending http commands using http request. Later we will be using this library as keywords in robot frame work.
commands.py
We are going to use library from commands.py to send SetPower and GetPower.
import requests
import re
class commands(object):
ROBOT_LIBRARY_SCOPE = 'GLOBAL'
def __init__(self, ip='localhost:5000'):
self.ip_address = ip
self.query = {}
self.user = 'admin'
self.passw = '12345678'
def form_query(self, state, cmd, port):
port = self.get_port_no(port)
self.query = {port: state}
return self.query
def get_port_no(self, port_no):
port = 'P6' + str(port_no)
return port
def clean_html(self, data):
exp = re.compile('<.*?>')
text = re.sub(exp, "", data)
return text.rstrip()
def send_cmds(self, cmd, port=None, state=None):
url = 'http://{}:{}@{}/SetCmd?CMD={}'\
.format(self.user,
self.passw,
self.ip_address,
cmd)
print url
if cmd == 'SetPower':
self.form_query(state, cmd, port)
self.req = requests.get(url, params=self.query)
return True
elif cmd == 'GetPower':
self.req = requests.get(url)
data = self.clean_html(self.req.text)
return data
else:
return False
return self.req.text
# c = commands('localhost:5000')
# c.send_cmds('SetPower', 2, 1)
# c.send_cmds('SetPower', 3, 1)
# print c.send_cmds('GetPower')
Python key word documentation
send_cmds(cmd, port=None, state=None)is the function we are going to use.- While using this function in Robot key word, no need to bother about
_, orLowercaserorUppercasein function name.
Python function will look like this while using as keyword,
Send Cmds cmd port state
Writing test Keywords
We are going to use Send Cmds as python keyword in test suite.
-
RPS send commands uses following four arguments to set power
- command = SetPower
- port = 2
- state = 1 for ON / 0 for off When we call that command it will turn ON/OFF the power supply
-
RPS get power will return the status of all the Power supply ports
*** Keywords ***
RPS send commands
[Arguments] ${command} ${port} ${state}
${output}= Send cmds ${command} ${port} ${state}
[return] ${output}
RPS get Power
[Arguments] ${command}
${output}= Send cmds ${command}
[return] ${output}}
Algorithm to test power supply
- Set power to a port
- Check the status of cmd
- Get the status of the port and check whether it is ON/OFF
Writing test cases using the above key words
Now we are ready to write test case using following two keywords
- RPS send commands - To set and unset a power of port
- RPS get power - To get the status of all the port
*** Settings ***
Library commands.py
*** Test Cases ***
Turn on Power supply 2 remotely
${out}= RPS send commands SetPower 2 1
Should be equal ${out} ${True}
Verify power supply 2 is on
${out}= RPS get power GetPower
should contain ${out} P62=1
Turn off Power supply 2 remotely
${out}= RPS send commands SetPower 2 0
Should be equal ${out} ${True}
Verify power supply 2 is off
${out}= RPS get power GetPower
should contain ${out} P62=0
Create a file name remote-power-supply.robot
Copy above key words and test case in to the file.
How to execute RPS server and remote-power-supply.robot ?
- Run remote power supply first
- Run the test suite remote-power-supply.robot
$ export FLASK_APP=rps-server.py
$ flask run
$ pybot remote-power-supply.robot
Output
$ pybot remote-pwer-supply.robot
==============================================================================
Remote-Pwer-Supply
==============================================================================
Turn on Power supply 2 remotely | PASS |
------------------------------------------------------------------------------
Verify power supply 2 is on | PASS |
------------------------------------------------------------------------------
Turn off Power supply 2 remotely | PASS |
------------------------------------------------------------------------------
Verify power supply 2 is off | PASS |
------------------------------------------------------------------------------
Remote-Pwer-Supply | PASS |
4 critical tests, 4 passed, 0 failed
4 tests total, 4 passed, 0 failed
==============================================================================
Output: /tmp/talks/robot-framework-intro/test-cases/output.xml
Log: /tmp/talks/robot-framework-intro/test-cases/log.html
Report: /tmp/talks/robot-framework-intro/test-cases/report.html
Following two diagrams explains about test architecture between RPS and RF
Remote Power supply test architecture
Robot frame work architecture
Credits
Thanks to robot framework for architecture diagram.
