String Test Example

string.test.js

import {ucFirst, snakeCase, camelCase, sentenceCase, ucWords, titleCase, nestedFromDot} from '~/helper/string'

describe('string helper functions', ()=>{
    test('ucFirst capitalizes the first letter in a string', ()=>{
        expect(ucFirst('hello world')).toBe('Hello world')
    })
    test('ucWords capitalizes the first letter in each word of a string', ()=>{
        expect(ucWords('hello world')).toBe('Hello World')
    })

    // snake case
    test('snake case converts dashed strings to snakecase', ()=>{
        expect(snakeCase('hello-world')).toBe('hello_world')
    })
    test('snake case converts camel case strings to snakecase', ()=>{
        expect(snakeCase('helloWorld')).toBe('hello_world')
    })
    test('snake case converts sentence case strings to snakecase', ()=>{
        expect(snakeCase('Hello world')).toBe('hello_world')
    })

    //camel case
    test('camel case converts dashed strings to camelcase', ()=>{
        expect(camelCase('hello-world')).toBe('helloWorld')
    })
    test('camel case converts snake case strings to camelcase', ()=>{
        expect(camelCase('hello_world')).toBe('helloWorld')
    })
    test('camel case converts sentence case strings to camelcase', ()=>{
        expect(camelCase('Hello world')).toBe('helloWorld')
    })

    //sentence case
    test('sentence case converts dashed strings to sentence case', ()=>{
        expect(sentenceCase('hello-world')).toBe('Hello world')
    })
    test('sentence case converts snake case strings to sentence case', ()=>{
        expect(sentenceCase('hello_world')).toBe('Hello world')
    })
    test('sentence case converts camelCase strings to sentence case', ()=>{
        expect(sentenceCase('helloWorld')).toBe('Hello world')
    })

    //title case
    test('title case converts dashed strings to title case', ()=>{
        expect(titleCase('hello-world')).toBe('Hello World')
    })
    test('title case converts snake case strings to title case', ()=>{
        expect(titleCase('hello_world')).toBe('Hello World')
    })
    test('title case converts camelCase strings to title case', ()=>{
        expect(titleCase('helloWorld')).toBe('Hello World')
    })
    test('title case ignores filler words in the middle of the string', ()=>{
        expect(titleCase('this is a test')).toBe('This is a Test')
    })
    test('title case capitalizes filler words at the beginning of the string', ()=>{
        expect(titleCase('The test has begun')).toBe('The Test has Begun')
    })
})