@Test
    public void testWithoutEmbedded() throws Exception {
        assertEmbeddedFiles(0, "testEXCEL.xlsx");
        assertEmbeddedFiles(0, "testWORD.docx");
        assertEmbeddedFiles(1 /* thumbnail as default */, "testPPT.pptx");
    }
For office files which don't have anything embedded in them
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/test/java/org/apache/tika/parser/microsoft/ooxml/OOXMLContainerExtractionTest.java