// After close, temp files should be cleaned up
        long tmpFilesAfter = countTmpFiles();
        assertEquals(tmpFilesBefore, tmpFilesAfter);
    }

    @Test
    public void test_SmallThresholdResponse_UsesFileBasedCache() throws Exception {
        // ## Arrange ##
        String body = "small body but threshold is 0";
        CurlRequest req = new OpenOverrideCurlRequest(Curl.Method.GET, "http://dummy",