Add mocha and chai test framework

  - Mocha/Chai/Sinon test frameowrk because it has 100% feature parity with vue-loader.
  - Code for making 'expect' function accessible globally.

Signed-off-by: Sukanya Pandey <sukapan1@in.ibm.com>
Change-Id: Idf809cb08d8c1ef177ff92f0ee1be04ac74059a3
diff --git a/package-lock.json b/package-lock.json
index bcd1bbc..8a80c69 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -936,9 +936,9 @@
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