Added comprehensive tests for loader (95.58% coverage)#6130

anshukaushik4700 wants to merge 4 commits intosugarlabs:mastersugarlabs/musicblocks:masterfrom

anshukaushik4700:test/increasing_coverage_in_loader.test.jsanshukaushik4700/musicblocks:test/increasing_coverage_in_loader.test.jsCopy head branch name to clipboard