grafana/public/app/features/explore/utils/prometheus.test.ts

import { parseSelector } from './prometheus';

describe('parseSelector()', () => {
  let parsed;

  it('returns a clean selector from an empty selector', () => {
    parsed = parseSelector('{}', 1);
    expect(parsed.selector).toBe('{}');
    expect(parsed.labelKeys).toEqual([]);
  });

  it('throws if selector is broken', () => {
    expect(() => parseSelector('{foo')).toThrow();
  });

  it('returns the selector sorted by label key', () => {
    parsed = parseSelector('{foo="bar"}');
    expect(parsed.selector).toBe('{foo="bar"}');
    expect(parsed.labelKeys).toEqual(['foo']);

    parsed = parseSelector('{foo="bar",baz="xx"}');
    expect(parsed.selector).toBe('{baz="xx",foo="bar"}');
  });

  it('returns a clean selector from an incomplete one', () => {
    parsed = parseSelector('{foo}');
    expect(parsed.selector).toBe('{}');

    parsed = parseSelector('{foo="bar",baz}');
    expect(parsed.selector).toBe('{foo="bar"}');

    parsed = parseSelector('{foo="bar",baz="}');
    expect(parsed.selector).toBe('{foo="bar"}');
  });

  it('throws if not inside a selector', () => {
    expect(() => parseSelector('foo{}', 0)).toThrow();
    expect(() => parseSelector('foo{} + bar{}', 5)).toThrow();
  });

  it('returns the selector nearest to the cursor offset', () => {
    expect(() => parseSelector('{foo="bar"} + {foo="bar"}', 0)).toThrow();

    parsed = parseSelector('{foo="bar"} + {foo="bar"}', 1);
    expect(parsed.selector).toBe('{foo="bar"}');

    parsed = parseSelector('{foo="bar"} + {baz="xx"}', 1);
    expect(parsed.selector).toBe('{foo="bar"}');

    parsed = parseSelector('{baz="xx"} + {foo="bar"}', 16);
    expect(parsed.selector).toBe('{foo="bar"}');
  });

  it('returns a selector with metric if metric is given', () => {
    parsed = parseSelector('bar{foo}', 4);
    expect(parsed.selector).toBe('{__name__="bar"}');

    parsed = parseSelector('baz{foo="bar"}', 12);
    expect(parsed.selector).toBe('{__name__="baz",foo="bar"}');

    parsed = parseSelector('bar:metric:1m{}', 14);
    expect(parsed.selector).toBe('{__name__="bar:metric:1m"}');
  });
});