feat: add rxjs exmaple (#39)

* feat: add rxjs example

* chore: add link to rxjs example on README.md

* feat: add README.md

* fix: modify package.json that mocha version should be latest

* fix: reformat with prettier

* chore: modify README.md to trigger CLA after configuring email for this repo

Author: irrationnelle

README.md

@@ -21,6 +21,7 @@ A set of examples to help demontrate common configurations using Mocha. They sho
 - [Express REST API](packages/express-rest-api/)
 - [Node Sqlite 3 example](packages/node-sqlite3/)
 - [Playwright application](packages/playwright/)
+- [RxJs example](packages/rxjs/)
 
 ## Adding a new example
 

packages/rxjs/.gitignore

@@ -0,0 +1 @@
+node_modules

packages/rxjs/README.md

@@ -0,0 +1,13 @@
+# RxJs examples
+
+Mocha test examples with marble diagram for RxJs(6.6.3).
+
+This example focus on how to handle source properties and test process is described for observable streams handling properties.
+
+First test proves an use case for marble diagram and helps understand basic operators of Observable.
+
+Second test show a practical use case with Observable and custom operators by users.
+
+## Commands
+
+- `npm test` - Run mocha tests.

packages/rxjs/custom-operator.js

@@ -0,0 +1,10 @@
+const { map, throttleTime } = require("rxjs/operators");
+
+const getNames = (source) => source.pipe(map((value) => value.name));
+
+const throttleTimeForThreeMs = (source) => source.pipe(throttleTime(3));
+
+module.exports = {
+  getNames,
+  throttleTimeForThreeMs,
+};