Added more tests for skipUnquotedValues()

[oskaredv]

Five new tests that increase the branch coverage of skipUnquotedValues() by covering five branches of the method that was not covered yet

[Marcono1234]

Might be good to add some kind of assertion after the skipValue(); calls to make sure it actually had an effect. However, since these cases all seem to represent invalid lenient JSON, I am not sure if there is a way to perform any reasonable assertion; maybe checking JsonReader.getPath() would work at least.

Feel free to only consider this a suggestion; I am not a member of this project.

[oskaredv]

Thanks for the suggestion! I initially tried to add assertions after skipValue(), but did not manage to do it since the cases represent invalid lenient JSON. With JsonReader.getPath()and JsonReader.getPreviousPath() I managed to add assertions after skipValue() in two of the tests. For the other three JsonReader.getPath() returned null values after skipValue() and I did not know what do to with that.