One of strings in array to match an expression

Question

The Problem:

I have an array of promises which is resolved to an array of strings. Now the test should pass if at least one of the strings matches a regular expression.

Currently, I solve it using simple string concatenation:

protractor.promise.all([text1, text2, text3]).then(function (values) {
    expect(values[0] + values[1] + values[2]).toMatch(/expression/);
});

Obviously, this does not scale well and is not particularly readable.

The Question:

Is is possible to solve it using a custom jasmine matcher, or jasmine.any() or custom asymmetric equality tester?

Answer 1

You could simply use map to get a list of boolean and then assert the result with toContain(true):

var all = protractor.promise.all;
var map = protractor.promise.map;

expect(map(all([text1, text2, text3]), RegExp.prototype.test, /expression/)).toContain(true);

You could also use a custom matcher:

expect(all([text1, text2, text3])).toContainPattern(/expression/);

And the custom matcher declared in beforeEach:

beforeEach(function() {
  jasmine.addMatchers({
    toContainPattern: function() {
      return {
        compare: function(actual, regex) {
          return {
            pass: actual.some(RegExp.prototype.test, regex), 
            message: "Expected [" + actual + "] to have one or more match with " + regex
          };
        }
      };
    }
  });
});