Add 18 equals() test cases for Day class#460
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Added comprehensive tests for Day.equals(Object) method, covering reflexivity, equality, null comparison, and date differences.
## Summary Add 11 new test methods to verify the behavior of MultiplePiePlot.setPieChart(JFreeChart). Add tests covering normal path validation, null parameter handling, invalid plot type rejection, multiple consecutive sets with error checking, dataset preservation, and exception message format validation. Add boundary edge case testing for null datasets and verify state immutability on failed operations. ## Why Existing tests completely lacked coverage for the setPieChart() method, which is a critical public API for configuring the pie chart template used by MultiplePiePlot. The method has multiple validation checks (null checks, type validation) and state management logic that could regress without explicit test coverage. These tests provide early detection for potential issues like incorrect exception handling, state corruption on failed calls, or changes to type validation. Exception message format tests also validate error messaging contract compliance. ## Verification Ran mvn clean test -Dtest=MultiplePiePlotTest Result: Tests run: 16 (5 existing + 11 new), Failures: 0, Errors: 0, Skipped: 0
Removed tests related to setting pie charts in MultiplePiePlot.
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Summary
Add comprehensive test coverage for the Day.equals(Object) method with 18 test cases covering reflexivity, symmetry, consistency, null/non-Day object comparisons, date differences, and boundary cases (1900-9999) to improve behavioral stability and prevent regressions.
Why
Current tests for Day.equals(Object) are minimal and do not explicitly cover critical equality contract requirements and boundary cases. These scenarios are easy to regress (e.g., through changes to comparison logic or type checking), so explicit tests improve behavioral stability and ensure proper implementation of the equals contract.
Verification
Ran mvn -Dtest=DayTest test
Result: all tests passed