feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

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diff --git a/vanilla/node_modules/istanbul-lib-coverage/README.md b/vanilla/node_modules/istanbul-lib-coverage/README.md
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+## istanbul-lib-coverage
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/istanbuljs/istanbul-lib-coverage.svg)](https://greenkeeper.io/)
+[![Build Status](https://travis-ci.org/istanbuljs/istanbul-lib-coverage.svg?branch=master)](https://travis-ci.org/istanbuljs/istanbul-lib-coverage)
+
+An API that provides a read-only view of coverage information with the ability
+to merge and summarize coverage info.
+
+Supersedes `object-utils` and `collector` from the v0 istanbul API.
+
+See the docs for the full API.
+
+```js
+var libCoverage = require('istanbul-lib-coverage');
+var map = libCoverage.createCoverageMap(globalCoverageVar);
+var summary = libCoverage.createCoverageSummary();
+
+// merge another coverage map into the one we created
+map.merge(otherCoverageMap);
+
+// inspect and summarize all file coverage objects in the map
+map.files().forEach(function(f) {
+    var fc = map.fileCoverageFor(f),
+        s = fc.toSummary();
+    summary.merge(s);
+});
+
+console.log('Global summary', summary);
+```