function differentSymbolsNaive(str) {
    if(!str) return 0
    var stringsArr = str.split('')

    var uniqueArr = []

    stringsArr.length > 0 && stringsArr.forEach((em => {
        if(!uniqueArr.includes(em)) {
            uniqueArr.push(em)
        }
    }))

    return uniqueArr.length
}

describe('differentSymbolsNaive()', () => {
    it('returns count of unique characters when input is all strings', () => {
        const str = 'cabca';
        const result = differentSymbolsNaive(str);
        expect(result).toBe(3);
    });
    
    it('returns count of unique characters when input is all symbols', () => {
        const str = '+-$%+-';
        const result1 = differentSymbolsNaive(str);
        expect(result1).toBe(4);
    });
        
    it('returns count of unique characters when input is mix', () => {
        const str = 'ca+=+cba';
        const result2 = differentSymbolsNaive(str);
        expect(result2).toBe(5);
    });
    
     it('returns count of unique characters when input is an empty string', () => {
        const str = '';
        const result3 = differentSymbolsNaive(str);
        expect(result3).toBe(0);
    });
    
    it('returns 0 if value is falsy', () => {
        const str = null;
        const result4 = differentSymbolsNaive(str);
        expect(result4).toBe(0);
    });
    
     it('returns count of 1 character when the input string of 1 character', () => {
        const str = 'a';
        const result5 = differentSymbolsNaive(str);
        expect(result5).toBe(1);
    });
    
    it('returns count of unique letter (upper and lower case) characters', () => {
        const str = 'Abhijith';
        const result6 = differentSymbolsNaive(str);
        expect(result6).toBe(6);
    });
    
     it('returns count of unique chars in Upper and lower case string', () => {
        const str = 'ZZZzzzz';
        const result7 = differentSymbolsNaive(str);
        expect(result7).toBe(2);
    });
});