* Split Information functions into a dedicated class and namespace and categorise as Value or Error
* Refactor all error functions into the new ExcelError class
Replace mock tests with real ones when possible. The original tests are all still present; they just take place in a more representative scenario.
After this, there will be 4 remaining uses of mocking. Of these, 3 are needed for scenarios which are otherwise hard to test - WebServiceTest, CellsTest, and SampleCoverageTest. For the other one, AutoFilterTest, I just can't figure out what it's trying to accomplish, so have left it alone.
This change is almost entirely restricted to tests. There is a one-line change in src. When the first argument passed to OFFSET is null or nullstring, the returned value is currently 0. However, according to the documentation for Excel, it should be `#VALUE!`. The code is changed accordingly.
* Additional unit tests for VLOOKUP() and HLOOKUP()
* Additional unit tests for CHOOSE()
* Unit tests for HYPERLINK() function
* Fix CHOOSE() test for spillage
Mark Baker
oleibman