Add test coverage for json package (#19300)
Add test coverage for json package (#19300)

Adding more tests to increase line coverage for json package. Adding coverage for missing code paths by testing various loadFromString inputs.

Risk Level: Low
Testing: Added tests to json_loader_test
Docs Changes: n/a
Release Notes: n/a
Platform Specific Features: n/a

This PR seeks to improve this issue: #1963

Signed-off-by: Tom Hadlaw <569e2f2e27b007c0bdcf61cc9727182601df47ee@gmail.com>
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