Expect item in array

One of my test expects an error message text to be one of multiple values. Since getText() returns a promise I cannot use toContain() jasmine matcher. The following would not work since protractor (jasminewd under-the-hood) would not resolve a promise in the second part of the matcher, toContain() in this case:

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

Question: Is there a way to check if an element is in an array with jasmine+protractor where an element is a promise?

In other words, I'm looking for inverse of toContain().

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As a workaround, I can resolve the promise with then():

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

I'm not sure if this is the best option. I would also be okay with a solution based on third-parties like jasmine-matchers .

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As an example, this kind of assertion exists in Python:

self.assertIn(1, [1, 2, 3, 4])