Initial test harness for incremental parser tests.
Remove unnecessary switch case.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.
Add incremental test.