Expect item in array

Question

One of my test expects an error message text to be one of multiple values. Since getText() returns a promise I cannot use toContain() jasm

Answer 1

The alternative solution is to use .toMatch() matcher with Regular Expressions and specifically a special character | (called "or"), which allows to match only one entry to succeed:

expect(page.errorMessage.getText()).toMatch(/Unknown Error|Connection Error/);

Answer 2

Looks like you need a custom matcher. Depending on the version of Jasmine you are using:

With Jasmine 1:

this.addMatchers({
    toBeIn: function(expected) {
        var possibilities = Array.isArray(expected) ? expected : [expected];
        return possibilities.indexOf(this.actual) > -1;
    }
});

With Jasmine 2:

this.addMatchers({
    toBeIn: function(util, customEqualityTesters) {
        return {
            compare: function(actual, expected) {
                var possibilities = Array.isArray(expected) ? expected : [expected];
                var passed = possibilities.indexOf(actual) > -1;

                return {
                    pass: passed,
                    message: 'Expected [' + possibilities.join(', ') + ']' + (passed ? ' not' : '') + ' to contain ' + actual
                };
            }
        };
    }
});

You'll have to execute this in the beforeEach section on each of your describe blocks it's going to be used in.

Your expect would look like:

expect(page.errorMessage.getText()).toBeIn(["Unknown Error", "Connection Error"]);

Answer 3

To me, the work-around that you identified is the best solution. However, we should not forget that this is an asynchronous execution and you might want to consider Jasmine's asynchronous support.

Then, your test will look like the following one:

it('should check item is in array', function(done){ //Note the argument for callback

    // do your stuff/prerequisites for the spec here

    page.errorMessage.getText().then(function (text) {
        expect(["Unknown Error", "Connection Error"]).toContain(text);
        done(); // Spec is done! 
    });
});

Note: If you don't pass this done argument to the spec callback, it is going to run to completion without failures, but no assertions are going to be reported in the execution results for that spec (in other words, that spec will have 0 assertions) and it might lead to confusions.