chartjs / Chart.js / 2526

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Enhance context acquisition on chart creation

Add support for creating a chart from the canvas id and prevent exceptions, at construction time, when the given item doesn't provide a valid CanvasRenderingContext2D or when the getContext API is not accessible (e.g. undefined by add-ons to prevent fingerprinting). New jasmine matcher to verify chart validity.

30 of 30 new or added lines in 2 files covered. (100.0%)

3716 of 4267 relevant lines covered (87.09%)

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