Simulate file upload while testing Node Js application using Chai

Question

I am testing my API which receives a file as input. I tried using attach() function and it works pretty much fine. To cover all my use cases, I will have to use around 20 different input files. Instead of keeping all these 20 files, I was thinking of storing every such possible inputs in a single JSON file.

Example:

{
    "input-1":[
       "Name, Email, Phone, Address",
       "Sam, [email protected],0123498765,HomeAddress"
    ],
    "input-2":[
       "Name, Email, Phone, Address",
       "Yam, [email protected],0123498766,HomeAddress"
    ],
    "input-3":[
       "Name, Email, Phone, Address",
       "Ram, [email protected],0123498767,HomeAddress"
    ]
}

Here each entry (input-1,input-2,input-3) represents content for each file. This is just a sample. The actual file will have multiple lines for each such test input.

So, what I need is to extract each input and convert it as a file while calling the API. How do I achieve this using Chai?