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describe '#commas', ->it 'should insert commas into long numbers', -># zeroMorris.commas(0).should.equal("0")# positive integersMorris.commas(1).should.equal("1")Morris.commas(12).should.equal("12")Morris.commas(123).should.equal("123")Morris.commas(1234).should.equal("1,234")Morris.commas(12345).should.equal("12,345")Morris.commas(123456).should.equal("123,456")Morris.commas(1234567).should.equal("1,234,567")# negative integersMorris.commas(-1).should.equal("-1")Morris.commas(-12).should.equal("-12")Morris.commas(-123).should.equal("-123")Morris.commas(-1234).should.equal("-1,234")Morris.commas(-12345).should.equal("-12,345")Morris.commas(-123456).should.equal("-123,456")Morris.commas(-1234567).should.equal("-1,234,567")# positive decimalsMorris.commas(1.2).should.equal("1.2")Morris.commas(12.34).should.equal("12.34")Morris.commas(123.456).should.equal("123.456")Morris.commas(1234.56).should.equal("1,234.56")# negative decimalsMorris.commas(-1.2).should.equal("-1.2")Morris.commas(-12.34).should.equal("-12.34")Morris.commas(-123.456).should.equal("-123.456")Morris.commas(-1234.56).should.equal("-1,234.56")# nullMorris.commas(null).should.equal('-')