test: expand unit test coverage for AutoCompletion, AutoCompletePopupWindow, ParameterizedCompletionContext

[bobbylight]

Summary

Expands unit test coverage across three core classes: AutoCompletePopupWindow (previously untested), AutoCompletion, and ParameterizedCompletionContext.

Details

• Added AutoCompletePopupWindowTest, covering key navigation actions (Up/Down/Home/End/PageUp/PageDown with wraparound), Enter/Tab/Escape handling, mouse double-click insertion, getSelection() before/after hiding, setCompletions, list cell renderer round-trip, description window color/size (before and after the window is created), disposeDescWindow, toggleDescriptionWindow edge cases, the static install/uninstallDescWindowToggleKey helpers, updateUI, and setVisible lifecycle behavior.
• Extended AutoCompletionTest with tests for getCompletionProvider, getDescWindowFactory/setDescWindowFactory (verifying the custom factory is actually used to build the description window), setDescriptionWindowSize applied lazily before the popup exists, isAutoActivationEnabled/setAutoActivationEnabled round-tripping, and both branches of parameterized completion assistance for zero-parameter completions (typed vs. untyped start character).
• Extended ParameterizedCompletionContextTest with tests for the NextChoiceAction fallback path when the parameter choices window isn't visible, and for ClosingAction's "closing paren is part of the argument text" branch.

Test plan

• ./gradlew clean build passes locally (checkstyle, spotbugs, and all unit tests).

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.52%. Comparing base (e7521ba) to head (29e43be).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #128      +/-   ##
============================================
+ Coverage     74.33%   77.52%   +3.19%     
- Complexity      713      742      +29     
============================================
  Files            36       36              
  Lines          3253     3253              
  Branches        520      520              
============================================
+ Hits           2418     2522     +104     
+ Misses          540      435     -105     
- Partials        295      296       +1     

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