JS: describe how to run tests in node.js

js/js.translator/testData/README.md

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+To run tests in node.js your need the following prerequisites installed:
+
+* node.js itself (installation is platform-dependent);
+* mocha (`npm install -g mocha`).
+
+Run `nmp install` from this directory to download all additional dependencies for tests.
+
+First, you need to run box tests via JUnit. JUnit tests additionally generate *mocha* runners
+(i.e. `.node.js` files).
+
+Second, run `mocha` from this directory.
+
+You can declare `KOTLIN_JS_LOCATION` environment variable to customize location of `kotlin.js` library,
+`../../../dist/js/kotlin.js` used by default.

js/js.translator/testData/package.json

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+{ "dependencies" : {
+
+    "require-from-string" : "1.2.0"
+  }
+}