fix(compiler): make sure LanguageService
updated with test file information before getting diagnostics for test file
#1507
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Summary
In #1483, we introduced caching imported modules for test files and use that cache to do type checking for test files once one of the imported modules' contents changes.
However, this causes a bug that when running tests with cache and one of the imported modules' contents changes, language service sometimes doesn't have the information of the test file to do type checking which then throws error
Cannot find source file ....
.close #1506
close #1523
Test plan
Does this PR introduce a breaking change?
Other information
N.A.