Integration tests for D3FC #458
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This PR adds simple smoke/integration tests to
perspective-viewer-d3fc, using the same puppeteer/record matching approach used byperspective-viewerand friends, details of which can be found in the perspective documentation. These tests are designed to prevent us from merging changes which "obviously" break the plugin, rather than provide fine-grained feedback as to what failed; as such, they are really meant to be run mostly by travis, and before opening a PR, rather than iteratively during development.The tests also assert that the Chrome console logs no errors while running - and one fix for tooltips was needed to achieve this, checking that the SVG tree itself is still attached to the DOM.