Test Class for LWC Component

Question

I have a LWC Component which is used for record upload process.

Below is my LWC Javascript code:

import { LightningElement, api } from 'lwc';
import file1 from '@salesforce/apex/customLwcController.file1';
import file2 from '@salesforce/apex/customLwcController.file2';

    export default class customRecordProcess extends LightningElement {
        @api customRecordId;
        fileName = null;
        customFileId = null;
        showModalButton = false;
        modalButtonLabel = '';
        showFileName = false;
        customFileIds = [];
        isModalOpen = false;
    
        onUploadComplete(file, result) {
            console.log('onUploadComplete');
            this.customFileIds.push({Id: result, Title: file.name});
            if (this.fileName === null) { 
                this.fileName = file.name;
                this.customFileId = result;
            }
            this.updateDisplayText();
        }
    
        handleFileUpload(event){
            let file = event.target.files[0];
            let reader = new customReader();
    
            file.sObject
            }
            }

Below is my HTML Code:

<template>
        <div class="slds-grid">
            <lightning-formatted-text class="left-col" value=""></lightning-formatted-text>
            
            <div class="middle-col">
                <lightning-input
                    class="inp middle-col" 
                    type="file"
                    onchange={handleFileUpload}>
                </lightning-input>
            </div>

            </template>

Below is the test class I have tried:

import { createElement } from 'lwc';
import customRecordProcess from 'c/customRecordProcess';
 
describe('c-customRecordProcess', () => {
    afterEach(() => {
        while (document.body.firstChild) {
            document.body.removeChild(document.body.firstChild);
        }
    });
 const fileName = 'Test';
 const uploadedFileId = '001992929'; 
    it('Should upload the file', () => {
        const fileName = 'Test';
const element = createElement('c-customRecordProcess', {
is: customRecordProcess
    });
    it(this.uploadedFileId != null, () => {
        assert.equal(this.uploadedFileId, '001992929'); 
    });
});

Now when I run this, I am getting error as

> Pattern:  - 0 matches npm ERR! code ELIFECYCLE npm ERR! errno 1 npm
> ERR! salesforce-app@1.0.0 test:unit: `sfdx-lwc-jest` npm ERR! Exit
> status 1 npm ERR! npm ERR! Failed at the salesforce-app@1.0.0
> test:unit script. npm ERR! This is probably not a problem with npm.
> There is likely additional logging output above.

Being new to JS testing, I am in process of troubleshooting what's wrong here. Can anyone please help me out on how to get this done?