this.projectNames = projectSelectors;
        }
    }

    static class ExceptionThrown implements ExpectedResult {
        final Class<? extends Throwable> expected;
        final String partOfMessage;

        ExceptionThrown(final Class<? extends Throwable> expected, final String partOfMessage) {
            this.expected = expected;

        Thread.sleep(100);

        boolean exceptionThrown = false;
        String exceptionMessage = null;
        try {
            suggester.switchIndex();
            fail("Should throw SuggesterException for unexpected update indices count");
        } catch (SuggesterException e) {
            exceptionThrown = true;
            exceptionMessage = e.getMessage();