Add the capability to get browser console messages

[AlexanderMoskovkin]

Are you requesting a feature or reporting a bug?

feature suggestion

What is the expected behavior?

It allows to check messages that your application outputs via console.log(), console.warn(), console.error(), console.info().

One of possible use cases is described in the Catch JS errors and console output discussion. React notifies about a PropTypes error via console.error but doesn't call something like throw new Error().

Proposed API:

fixture `My fixture`
    .beforeEach(await t => {
        var { error, warn, log, info } = await t.getConsoleMessages();

        const expectedInfoMessages = info.filter(msg => msg.indexOf('important message') > -1);

        await t
            .expect(error.length).eql(0)
            .expect(warn.length).eql(0)
            .expect(expectedInfoMessages.length).ok();
    });

Feel free to vote for the feature if you consider it useful and please let us know about your use case for it.

[dimaip]

One usecase for it would be to make tests fail on React PropTypes errors (React uses console.error to warn on such errors).

[lock]

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