@Test
    public void testPsDetection() throws Exception {
        // TODO: Need a test postscript file
        assertTypeByName("application/postscript", "x.ps");
        assertTypeByName("application/postscript", "x.PS");
        assertTypeByName("application/postscript", "x.eps");
        assertTypeByName("application/postscript", "x.epsf");
        assertTypeByName("application/postscript", "x.epsi");
    }
Formats which are based on plain text
tika-parsers/tika-parsers-standard/tika-parsers-standard-package/src/test/java/org/apache/tika/mime/TestMimeTypes.java