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test: add test suite for Trie data structure#1831
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,223 @@ | ||
| import { Trie } from '../Trie.js' | ||
| describe('Trie', () => { | ||
| describe('Constructor', () => { | ||
| it('should create an empty trie', () => { | ||
| const trie = new Trie() | ||
| expect(trie.root.key).toBe(null) | ||
| expect(trie.root.parent).toBe(null) | ||
| expect(trie.root.count).toBe(0) | ||
| expect(Object.keys(trie.root.children)).toHaveLength(0) | ||
| }) | ||
| }) | ||
| describe('insert', () => { | ||
| it('should insert words correctly', () => { | ||
| const trie = new Trie() | ||
| trie.insert('hello') | ||
| trie.insert('world') | ||
| trie.insert('hello') | ||
| expect(trie.contains('hello')).toBe(true) | ||
| expect(trie.contains('world')).toBe(true) | ||
| expect(trie.findOccurrences('hello')).toBe(2) | ||
| }) | ||
| it('should handle empty string insertion', () => { | ||
| const trie = new Trie() | ||
| trie.insert('') | ||
| expect(trie.contains('')).toBe(true) | ||
| expect(trie.findOccurrences('')).toBe(1) | ||
| }) | ||
| it('should not insert non-string values', () => { | ||
| const trie = new Trie() | ||
| trie.insert(123) | ||
| trie.insert(null) | ||
| trie.insert(undefined) | ||
| trie.insert({}) | ||
| trie.insert('valid') | ||
| expect(trie.contains('valid')).toBe(true) | ||
| }) | ||
| }) | ||
| describe('contains', () => { | ||
| it('should return true for existing words', () => { | ||
| const trie = new Trie() | ||
| trie.insert('test') | ||
| trie.insert('testing') | ||
| expect(trie.contains('test')).toBe(true) | ||
| expect(trie.contains('testing')).toBe(true) | ||
| }) | ||
| it('should return false for non-existing words', () => { | ||
| const trie = new Trie() | ||
| trie.insert('test') | ||
| expect(trie.contains('tes')).toBe(false) | ||
| expect(trie.contains('testing')).toBe(false) | ||
| expect(trie.contains('')).toBe(false) | ||
| }) | ||
| it('should handle prefix that is not a complete word', () => { | ||
| const trie = new Trie() | ||
| trie.insert('programming') | ||
| expect(trie.contains('program')).toBe(false) | ||
| expect(trie.contains('programming')).toBe(true) | ||
| }) | ||
| }) | ||
| describe('findOccurrences', () => { | ||
| it('should return correct occurrence count', () => { | ||
| const trie = new Trie() | ||
| trie.insert('apple') | ||
| trie.insert('apple') | ||
| trie.insert('app') | ||
| expect(trie.findOccurrences('apple')).toBe(2) | ||
| expect(trie.findOccurrences('app')).toBe(1) | ||
| expect(trie.findOccurrences('ap')).toBe(0) | ||
| }) | ||
| it('should return 0 for non-existing words', () => { | ||
| const trie = new Trie() | ||
| expect(trie.findOccurrences('nonexistent')).toBe(0) | ||
| }) | ||
| }) | ||
| describe('remove', () => { | ||
| it('should remove words correctly', () => { | ||
| const trie = new Trie() | ||
| trie.insert('hello') | ||
| trie.insert('hello') | ||
| trie.insert('hello') | ||
| trie.remove('hello', 2) | ||
| expect(trie.findOccurrences('hello')).toBe(1) | ||
| trie.remove('hello') | ||
| expect(trie.findOccurrences('hello')).toBe(0) | ||
| }) | ||
| it('should handle removing more occurrences than exist', () => { | ||
| const trie = new Trie() | ||
| trie.insert('test') | ||
| trie.remove('test', 5) | ||
| expect(trie.findOccurrences('test')).toBe(0) | ||
| }) | ||
| it('should not remove if count is invalid', () => { | ||
| const trie = new Trie() | ||
| trie.insert('test') | ||
| trie.remove('test', 0) | ||
| expect(trie.findOccurrences('test')).toBe(1) | ||
| trie.remove('test', -1) | ||
| expect(trie.findOccurrences('test')).toBe(1) | ||
| }) | ||
| it('should handle empty string removal', () => { | ||
| const trie = new Trie() | ||
| trie.insert('') | ||
| trie.insert('') | ||
| trie.remove('', 1) | ||
| expect(trie.findOccurrences('')).toBe(1) | ||
| }) | ||
| }) | ||
| describe('findAllWords', () => { | ||
| it('should find all words with given prefix', () => { | ||
| const trie = new Trie() | ||
| trie.insert('cat') | ||
| trie.insert('category') | ||
| trie.insert('caterpillar') | ||
| trie.insert('dog') | ||
| trie.insert('cattle') | ||
| const words = trie.findAllWords('cat') | ||
| expect(words).toHaveLength(4) | ||
| expect(words).toEqual( | ||
| expect.arrayContaining([ | ||
| { word: 'cat', count: 1 }, | ||
| { word: 'category', count: 1 }, | ||
| { word: 'caterpillar', count: 1 }, | ||
| { word: 'cattle', count: 1 } | ||
| ]) | ||
| ) | ||
| }) | ||
| it('should return empty array for non-existing prefix', () => { | ||
| const trie = new Trie() | ||
| trie.insert('hello') | ||
| expect(trie.findAllWords('world')).toEqual([]) | ||
| }) | ||
| it('should return words with correct counts', () => { | ||
| const trie = new Trie() | ||
| trie.insert('test') | ||
| trie.insert('test') | ||
| trie.insert('testing') | ||
| const words = trie.findAllWords('test') | ||
| expect(words).toEqual( | ||
| expect.arrayContaining([ | ||
| { word: 'test', count: 2 }, | ||
| { word: 'testing', count: 1 } | ||
| ]) | ||
| ) | ||
| }) | ||
| }) | ||
| describe('findPrefix', () => { | ||
| it('should return node for existing prefix', () => { | ||
| const trie = new Trie() | ||
| trie.insert('hello') | ||
| const node = trie.findPrefix('hell') | ||
| expect(node).not.toBeNull() | ||
| expect(node.key).toBe('l') | ||
| }) | ||
| it('should return null for non-existing prefix', () => { | ||
| const trie = new Trie() | ||
| trie.insert('hello') | ||
| expect(trie.findPrefix('world')).toBeNull() | ||
| }) | ||
| it('should return null for non-string input', () => { | ||
| const trie = new Trie() | ||
| expect(trie.findPrefix(123)).toBeNull() | ||
| }) | ||
| }) | ||
| describe('integration tests', () => { | ||
| it('should handle complex operations', () => { | ||
| const trie = new Trie() | ||
| const words = ['apple', 'application', 'app', 'banana', 'band'] | ||
| words.forEach((word) => trie.insert(word)) | ||
| words.forEach((word) => { | ||
| expect(trie.contains(word)).toBe(true) | ||
| }) | ||
| const appWords = trie.findAllWords('app') | ||
| expect(appWords).toHaveLength(3) | ||
| trie.remove('app') | ||
| expect(trie.contains('app')).toBe(false) | ||
| expect(trie.contains('apple')).toBe(true) | ||
| trie.insert('apple') | ||
| expect(trie.findOccurrences('apple')).toBe(2) | ||
| }) | ||
| }) | ||
| }) |
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