1. Open Runner
2. Drag and Drop your collection
3. Select the tests
4. Hit Run button

1. Open Terminal/CMD
2. Install newman npm install -g newman
3. Go to root path of the project
4. Enter command newman run TheCatAPI.postman_collection.json --environment TheCatAPI_Env.postman_environment.json
5. CLI will show below results

1. Open Terminal/CMD
2. Install reporters npm install -g newman-reporter-htmlextra
3. Go to root path of the project
4. Enter command newman run TheCatAPI.postman_collection.json --environment TheCatAPI_Env.postman_environment.json -r htmlextra --reporter-htmlextra-export .\TestResults\TestResult.html

1. Open Terminal/CMD
2. Install reporters npm install -g newman-reporter-csv
3. Go to root path of project
4. Enter command newman run TheCatAPI.postman_collection.json -r csv --reporter-csv-export .\testResults\TestResult.csv

Issue #1: When you run Postman collection using newman you may see error:

File C:\Users\admin\AppData\Roaming\npm\newman.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.

Solution: Follow step 1 to 3 given on https://www.c-sharpcorner.com/article/how-to-fix-ps1-can-not-be-loaded-because-running-scripts-is-disabled-on-this-sys/