assertContentType("text/x-java-source", "extractor/program/test.java", "test.java");
        assertContentType("application/javascript", "extractor/program/test.js", "test.js");
    }

    public void test_getContentType_content() throws IOException {
        assertContentType("text/plain", "test/text1.txt", "hoge.txt");
        assertContentType("text/plain", null, "hoge.txt");