How to pass resource bytes as parameters

Question

I have a Test method foo. I have test input large.zst in test/resources. Now I would like to pass the bytes of large.zst as byte[] into foo.

Is there any way of passing the file content as a byte array via Annotations?

Answer 1

Adapting the answer from @tquadrat to testng would look like this IMO:

    @DataProvider(name = "largeCompressed")
    private Object[] createLargeCompressed() {
        // Had no luck using `new Path`.
        URL url = this.getClass().getResource("/large.zst");
        Path path;
        try {
            path = Path.of(url.toURI());
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }
        try {
            return new Object[]{Files.readAllBytes(path)};
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Test(dataProvider = "largeCompressed")
    public void foo(byte[] largeCompressed) {
        // do something with the byte array …
    }