Tests fail under Node version 7

(Both @domoritz and I got the same problem)

Note that despite this error, we can still serve local web server or link it to vega editor seamlessly.

npm ERR! Darwin 16.1.0
npm ERR! argv "/usr/local/Cellar/node/5.0.0/bin/node" "/usr/local/bin/npm" "run" "test"
npm ERR! node v5.0.0
npm ERR! npm  v3.3.9
npm ERR! code ELIFECYCLE
npm ERR! vega@3.0.0-beta.5 test: `TZ=America/Los_Angeles tape 'test/**/*-test.js' && eslint index.js src test`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vega@3.0.0-beta.5 test script 'TZ=America/Los_Angeles tape 'test/**/*-test.js' && eslint index.js src test'.
npm ERR! This is most likely a problem with the vega package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     TZ=America/Los_Angeles tape 'test/**/*-test.js' && eslint index.js src test
npm ERR! You can get their info via:
npm ERR!     npm owner ls vega
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/kanitw/Documents/_code/_idl/_visrec/vega3/npm-debug.log

npm ERR! Darwin 16.1.0
npm ERR! argv "/usr/local/Cellar/node/5.0.0/bin/node" "/usr/local/bin/npm" "run" "build"
npm ERR! node v5.0.0
npm ERR! npm  v3.3.9
npm ERR! code ELIFECYCLE
npm ERR! vega@3.0.0-beta.5 build: `npm run test && uglifyjs build/vega.js -c -m -o build/vega.min.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vega@3.0.0-beta.5 build script 'npm run test && uglifyjs build/vega.js -c -m -o build/vega.min.js'.
npm ERR! This is most likely a problem with the vega package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm run test && uglifyjs build/vega.js -c -m -o build/vega.min.js
npm ERR! You can get their info via:
npm ERR!     npm owner ls vega
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/kanitw/Documents/_code/_idl/_visrec/vega3/npm-debug.log

npm ERR! Darwin 16.1.0
npm ERR! argv "/usr/local/Cellar/node/5.0.0/bin/node" "/usr/local/bin/npm" "install"
npm ERR! node v5.0.0
npm ERR! npm  v3.3.9
npm ERR! code ELIFECYCLE
npm ERR! vega@3.0.0-beta.5 prepublish: `npm run build`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vega@3.0.0-beta.5 prepublish script 'npm run build'.
npm ERR! This is most likely a problem with the vega package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm run build
npm ERR! You can get their info via:
npm ERR!     npm owner ls vega
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Users/kanitw/Documents/_code/_idl/_visrec/vega3/npm-debug.log

[jheer]

Test code, absolutely. I would normally just do “closeTo” but that’s not so handy for testing SVG path strings, scenegraph JSON, etc. Right now I’m thinking we might monkey patch Math.atan2 directly, then restore after tests complete. Better ideas welcomed!

[jheer]

As of 0b4221e05670e427f2fb895acc522cabea46cb4a, we’re now node 7 compliant, and have dropped explicit support for node 0.12. (Vega, but not the test suite, should still work under 0.12.)

After more investigation, I found problems beyond Math.atan2. So I bit the bullet and added a new specialized “deepEquals” operator (with error tolerance for numbers) for Vega scenegraphs and SVG paths. Upon reflection I decided this was the cleaner, more future-proof (and more time-efficient) route. These are exported as the new sceneEqual and pathEqual utilities in vega-scenegraph.