Improve code coverage

[kalaiyarasiganeshalingam]

Purpose

$Subject

Related issue #1217

[codecov]

Codecov Report

Merging #83 (b7bf253) into master (e4c6fd8) will increase coverage by 12.47%.
The diff coverage is 84.21%.

@@              Coverage Diff              @@
##             master      #83       +/-   ##
=============================================
+ Coverage     77.74%   90.22%   +12.47%     
- Complexity      117      134       +17     
=============================================
  Files            13       13               
  Lines           319      317        -2     
  Branches         33       34        +1     
=============================================
+ Hits            248      286       +38     
+ Misses           59       23       -36     
+ Partials         12        8        -4     

Impacted Files	Coverage Δ	Complexity Δ
...ng/stdlib/task/exceptions/SchedulingException.java	100.00% <ø> (+100.00%)	1.00 <0.00> (+1.00)
...ballerinalang/stdlib/task/actions/TaskActions.java	76.81% <33.33%> (+3.95%)	13.00 <0.00> (ø)
...ballerinalang/stdlib/task/objects/TaskManager.java	94.59% <93.33%> (+28.39%)	32.00 <7.00> (+8.00)
...ava/org/ballerinalang/stdlib/task/utils/Utils.java	98.14% <100.00%> (+20.37%)	20.00 <0.00> (+3.00)
.../ballerinalang/stdlib/task/utils/TaskListener.java	83.33% <0.00%> (-11.12%)	7.00% <0.00%> (-1.00%)
task-ballerina/scheduler.bal	100.00% <0.00%> (+2.56%)	36.00% <0.00%> (+5.00%)
task-ballerina/commons.bal	100.00% <0.00%> (+8.33%)	3.00% <0.00%> (+1.00%)

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