import { levenshteinDistance } from '../../src/ts/mmui-util/levenshtein';

test('levenshteinDistance: No distance', () => {
  const word0 = 'Yellow';
  const word1 = 'Yellow';
  const d: number = levenshteinDistance(word0, word1);
  expect(d).toBe(0);
});
test('levenshteinDistance: One edit distance', () => {
  const word0 = 'Yellow';
  const word1 = 'Mellow';
  const d: number = levenshteinDistance(word0, word1);
  expect(d).toBe(1);
});
test('levenshteinDistance: Empty Right', () => {
  const d: number = levenshteinDistance('Blue', '');
  expect(d).toBe(4);
});
test('levenshteinDistance: Empty left', () => {
  const d: number = levenshteinDistance('', 'Blue');
  expect(d).toBe(4);
});
test('levenshteinDistance: Both empty', () => {
  const d: number = levenshteinDistance('', '');
  expect(d).toBe(0);
});
test('levenshteinDistance: Null left argument', () => {
  expect(() => {
    levenshteinDistance(null, 'Yellow');
  }).toThrowError();
});
test('levenshteinDistance: Null right argument', () => {
  expect(() => {
    levenshteinDistance('Yellow', null);
  }).toThrowError();
});
test('levenshteinDistance: Null arguments', () => {
  expect(() => {
    levenshteinDistance(null, null);
  }).toThrowError();
});