Add test case for validating WWW-Authorization header when invocating an API with API Keys using invalid Authorization header

[nisan-abeywickrama]

Purpose

As identified by [1], the WWW-Authorization response header contains null for an API with API-Key enabled. This PR introduces a test case to validate the WWW-Authorization header to validate the presence of the appropriate content.

Implementation

Introduce a new test case which checks if the WWW-Authorization header contains the string "API Key realm=\"WSO2 API Manager\"".

The validation is done under 2 possibilities,

• Invoking the Api without Authorization header.
• Invoking the Api with invalid Authorization header.

[1] - wso2/api-manager#3062

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 14.19%. Comparing base (b36568c) to head (aeeec6b).
Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13523      +/-   ##
============================================
- Coverage     17.83%   14.19%   -3.64%     
+ Complexity      897      668     -229     
============================================
  Files           255      255              
  Lines         11551    11551              
  Branches       1204     1204              
============================================
- Hits           2060     1640     -420     
- Misses         9474     9887     +413     
- Partials         17       24       +7     

Flag	Coverage Δ
integration_tests	14.19% <ø> (-3.64%)	⬇️

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