kafka-pub-sub/test/validations/validateTopic.test.js

An application which is designed based on apache kafka pub-sub.

const validateTopic = require('../../validation/validateTopic');

describe('validateTopic_function', () => {
  // Tests that the function does not throw an error when valid string topic with length between 5 and 20 characters is passed.
  it('test_validate_topic_with_valid_string', () => {
    expect(() => validateTopic('valid')).not.toThrow();
    expect(() => validateTopic('validstring')).not.toThrow();
    expect(() => validateTopic('validstringvalid')).not.toThrow();
  });

  // Tests that the function throws an error with a specific message when empty string topic is passed or not any string topic passed.
  it('test_validate_topic_with_empty_string', () => {
    expect(() => validateTopic('')).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
    expect(() => validateTopic()).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
  });

  // Tests that the function throws an error with a specific message when string topic with length less than 5 characters or more than 20 characters is passed.
  it('test_validate_topic_with_invalid_string', () => {
    expect(() => validateTopic('inv')).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
    expect(() => validateTopic('invalidstringinvalidmorethanlengthoftwenty')).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
  });

  // Tests that the function throws an error with a specific message when non-string topic is passed.
  it('test_validate_topic_with_non_string', () => {
    expect(() => validateTopic(123)).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
    expect(() => validateTopic(true)).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
    expect(() => validateTopic(null)).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
    expect(() => validateTopic({ key: 'value' })).toThrow(
      'Invalid topic: The type of topic should be string or the lenght should not be less than 5 and more than 20'
    );
  });
});