Write tests that focus on unique edge cases and avoid redundancy. When designing test suites: 1. Consolidate similar test cases that don't provide additional coverage 2. Focus on meaningful edge cases that actually test different code paths 3. Structure test fixtures to be reusable and parameterizable **Instead of redundant tests:** ```typescript it('should return empty array for empty object input', () => { expect(uniq({})).toStrictEqual([]); }); it('should return empty array for object with properties', () => { expect(uniq({key: 'value'})).toStrictEqual([]); }); ``` **Write a more meaningful test:** ```typescript it('should return empty array for array-like objects that are not arrays', () => { const arrayLike = {0: 'a', 1: 'b', length: 2}; expect(uniq(arrayLike as any)).toStrictEqual([]); }); ``` For test fixtures, place them in dedicated directories (e.g., `tests/js/fixtures/`) and design them to accept parameters for customization: ```typescript // tests/js/fixtures/tabularColumn.ts export const TabularColumnFixture = (params: Partial = {}): TabularColumn => ({ key: 'default-key', name: 'Default Name', type: 'string', ...params, }); ``` This approach improves test maintainability and ensures your test suite provides meaningful coverage without unnecessary bloat.