What we need to create a NPM project in a dir is creating package.json file in the root dir.
1.Create package.json by npm init -y
Than a package.json file be created in the root dir.
package.json
{
  "name": "testet",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Today is a good day.\""
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}
Note: don't add comment in package.json scripts fragment
run scripts that note in package.json
npm run test
The output:
PS C:\Users\89104\Desktop\testet> npm run test
> testet@1.0.0 test C:\Users\89104\Desktop\testet
> echo "Today is a good day."
"Today is a good day."
2.Write a package.json hand by hand
{
    "scripts": {
        "test": "echo \"Today is a good day\""
    }
}
 

 
    
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