Add colorsEqualEpsilon to ModelSpec test

[OmarShehata]

This fixes the test failure in #7073.

I figured it would be useful to be able to test if colors are close enough so our tests are more flexible. Feedback is welcome!

I don't think the color change is due to #6877 because it looks like the scene in the spec doesn't have a globe initialized, so I assume that means it's not rendering the atmosphere. The box itself still looks fine in CesiumJS.

[cesium-concierge]

Thanks for the pull request @OmarShehata!

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[hpinkos]

@OmarShehata you should be able to do expect(color).toEqualEpsilon(value, epsilon)

[hpinkos]

We have a custom jasmine matcher that should automatically call Color.equalsEpsilon when you do expect().toEqualEpsilon

[OmarShehata]

Ah, didn't realize that already existed. Thanks for pointing that out @hpinkos ! This seems to work.

[hpinkos]

Thanks @OmarShehata! The tests pass locally now. There was a weird test failure in the travis build though. I just restarted it to make sure it wasn't related to this change. I'll merge this if that passes

[hpinkos]

@OmarShehata I'm not sure exactly why, but the change you made is causing all of the model tests to fail in travis. I'm guessing something isn't being cleaned up correctly, so after your tests runs it's causing scene.frameState.commandList to have an extra command.

You can reproduce this locally by running npm run test -- --browsers FirefoxHeadless --webgl-stub --failTaskOnError --suppressPassed on the command line

[hpinkos]

Maybe this needs to be moved outside the function block?

[OmarShehata]

I think you were right @hpinkos !

[hpinkos]

Works great @OmarShehata, thanks!