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import { checkIfPatternExists } from '../PatternMatching'

describe('checkIfPatternExists', () => {

it('expects to find a pattern with correct input', () => {

const text = 'AABAACAADAABAAAABAA'

const pattern = 'AABA'

const SUT = checkIfPatternExists(text.toLowerCase(), pattern.toLowerCase())

expect(SUT).toBe('Given pattern is found at index 0')

})

it('expects to return a message when there is no pattern', () => {

const text = 'ABCDEFG'

const pattern = 'AEG'

const SUT = checkIfPatternExists(text.toLowerCase(), pattern.toLowerCase())

expect(SUT).toBe(undefined)

})

it('expects to find a pattern independent of casing', () => {

const text = 'AbCAAAAAAB'

const pattern = 'abc'

const SUT = checkIfPatternExists(text, pattern)

expect(SUT).toBe(undefined)

})

it('expects to throw an error message when given input is not a string', () => {

const text = 123444456

const pattern = 123

expect(() => checkIfPatternExists(text, pattern)).toThrow(

'Given input is not a string'

)

})