addValue() return value: -1
Rule count after calling addRule() with no arguments: 1
Rule text: undefined { }
Rule count after calling addRule with no index: 2
Second rule text: .test { font-size: 14px; }
Rule count after calling addRule with index 0: 3
Rule text: .test { padding: 100px; }
Exception thrown when given a negative index: IndexSizeError
Exception thrown when index out of range: IndexSizeError