fix: fix testcases to take push node environment from .env rather tha…

[ankur12-1610]

Fixes Issue

#1143

Changes proposed

Preloading .env

TS_NODE_PROJECT='./tsconfig.mocha.json' NODE_OPTIONS='--loader ts-node/esm' DOTENV_CONFIG_PATH='./tests/.env' mocha -r ts-node/register -r dotenv/config 'tests/**/*.test.ts' --timeout 1200000 --require tests/root.ts --serial

DOTENV_CONFIG_PATH='./tests/.env' and -r dotenv/config does the magic

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Dynamically accessing env in test files using .env

 // accessing env dynamically using process.env
 type EnvStrings = keyof typeof CONSTANTS.ENV;
 const envMode = process.env.ENV as EnvStrings;
 const env = CONSTANTS.ENV[envMode];

here keyof typeof helps accessing Enum types using strings as an object.

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.