Add Missing Tests for Autocomplete

[SuhailLoya]

fixes #98

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Files with missing lines	Coverage Δ	Complexity Δ
...utocompleter/exceptions/AutocompleteException.java	50.00% <ø> (ø)	1.00 <0.00> (ø)

... and 3 files with indirect coverage changes