Fix unit test failure on Windows

Author: rubensworks

test/parse/ClassLoader.test.ts

@@ -2563,7 +2563,7 @@ export = NS`,
 
     it('for a single import from an unknown package', () => {
       expect(() => loader.getClassElements('package', fileName, resolutionContext.parseTypescriptContents(`import {A as B} from 'unknown-package'`)).importedElements)
-        .toThrow(`Could not resolve 'unknown-package' from path 'dir/file'`);
+        .toThrow(/Could not resolve 'unknown-package' from path .*/u);
     });
 
     it('for export all', () => {