edge case tests for a palindrom checker, can you implement it?

palindrome-check-test.coffee

describe 'palindrome checker', -> 

    it 'should work for unicode characters (chinese)', (done) ->
        expect(palindromChecka "楚人楚").to.equal true
        done()

    # http://apps.timwhitlock.info/emoji/tables/unicode
    it 'should work with 3 byte unicode chars (emoji, unicode)', (done) ->
        expect(palindromChecka "\u2764").to.equal true
        done()

    it 'should work with 4 byte unicode chars (emoji, raw)', (done) ->
        expect(palindromChecka "😁").to.equal true
        done()
        
    it 'should work with 4 byte unicode chars (emoji, unicode)', (done) ->
        expect(palindromChecka "\u1F601").to.equal true
        done()