I think the intention of this code is to make sure that mockStartDate is always one day back from the current date, but this code will produce a number rather than a date. If this happens to run on the first day of the month, the result is that mockStartDate is 0 which will not produce test cases that reach all of the component's code.
Replace new Date().getDate() - 1 with code that will actually find the previous day's date.
See this line in the tests and this line in the component, for example.
I think the intention of this code is to make sure that
mockStartDateis always one day back from the current date, but this code will produce a number rather than a date. If this happens to run on the first day of the month, the result is thatmockStartDateis0which will not produce test cases that reach all of the component's code.Replace
new Date().getDate() - 1with code that will actually find the previous day's date.