Move the BasicOpTest into the correct package

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Move another test into an appropriate package

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Fix copy-pasted Javadoc

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>