####Steps to build and run the co2-calculator

1. Go to the root directory of the project
2. Build and containerized the service, run

docker build . -t co2-calculator

3. Run the service, use

docker run -e ORS_TOKEN=<token> co2-calculator:latest --start <start_city> -end <end_city> --transportation-method=<transport-type>

####Remarks:

1. if the start and the end city is not set, it is default to munich
2. if the transportation method is not set, it is default to small-diesel-car

####Example

1. from beijing to shanghai

docker run -e ORS_TOKEN=<token> co2-calculator:latest --start beijing -end shanghai --transportation-method=large-petrol-car

Outputs:
start: beijing
end: shanghai
method: large-petrol-car
Your trip caused 340.99kg of CO2-equivalent

2. from munich to frankfurt (do not need to specify munich as starting point, do not need to specify car type)

docker run -e ORS_TOKEN=<token> co2-calculator:latest -end frankfurt 

Outputs:
start: munich
end: frankfurt
method: small-diesel-car
Your trip caused 56.42kg of CO2-equivalent

3. unknown transportation type

docker run -e ORS_TOKEN=<token> co2-calculator:latest -end frankfurt --transportation-method=unkown 

Outputs:
start: munich
end: frankfurt
method: unkown
panic: transportation method unkown does not exist

4. ORS_TOKEN Not provided

 docker run  co2-calculator:latest -end frankfurt

Outputs:
panic: Env var ORS_TOKEN Not set

5. wrong token

docker run -e ORS_TOKEN=<wrong-token> co2-calculator:latest --end frankfurt

Outputs:
start: munich
end: frankfurt
method: small-diesel-car
panic: Cannot get coordinates of munich

####Run unit tests

detailed test report

docker run --volume=$(pwd):/ws  --workdir=/ws golang:1.12.1 /bin/bash -c "go test  -v ./..."

test with coverage info

docker run --volume=$(pwd):/ws  --workdir=/ws golang:1.12.1 /bin/bash -c "go test  -cover ./..."

Please be aware that we are running test in an empty golang container, so at beginning it will pull dependencies, which will take a bit time (20s)