public static SignatureTestVector[] createEd25519TestVectors() {
    return exceptionIsBug(
        () ->
            new SignatureTestVector[] {
              createTestVector0(), createTestVector1(), createTestVector2(), createTestVector3()
            });
  }
Test utilities for Ed25519. Test vectors are generated by hand for this test.
java_src/src/main/java/com/google/crypto/tink/signature/internal/testing/Ed25519TestUtil.java