 - In the IT field, infrastructure as a code helps maintain an application's underlying infrastructure by using programming. 
- **Terraform** is a coding tool aligned with this practice which allows us to define cloud and local resources in formatted configuration files that we can reuse and share.
- When we build infrastructure in Terraform configuration, a state file gets created in the local workspace directory named `terraform.tfstate`.

## The state file

- The **state file** is a JSON  containing the definition of our infrastructure. The file works with the Terraform code to define the “desired state” that we'll like to achieve.
- Whenever we change the configuration file, it automatically determines which part of our configuration is already created and which needs to be changed with the help of this file. 
- The state file helps provide a reference to Terraform to identify if a resource is present and stop it from being created again.
- The following code executes the Terraform infrastructure for a simple `hello state .tf` file and displays the state file. 

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


state check

React

Dart

GoJS React

Typescript React

Vue.js

## Explanation

In the above code, we initialize a Terraform module using `terraform init`, and then create a Terraform state file using `terraform apply -auto-approve`.
 
We see that `terraform.tfstate` file is created using `ls`.

We can also see the content of `terraform.tfstate` file using `cat terraform.tfstate`.

How the Terraform state file is created

Overview

The state file

Explanation