Test v6 key revocation

pgpainless-sop/src/test/java/org/pgpainless/sop/RevokeKeyTest.java

@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: 2025 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.sop;
+
+import org.bouncycastle.openpgp.api.OpenPGPCertificate;
+import org.bouncycastle.openpgp.api.OpenPGPKey;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.pgpainless.PGPainless;
+import org.pgpainless.algorithm.OpenPGPKeyVersion;
+import sop.SOP;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class RevokeKeyTest {
+
+    private static SOP sop;
+
+    @BeforeAll
+    public static void setup() {
+        sop = new SOPImpl();
+    }
+
+    @Test
+    public void revokeV6CertResultsInMinimalRevCert() throws IOException {
+        PGPainless api = PGPainless.getInstance();
+        OpenPGPKey v6Key = api.generateKey(OpenPGPKeyVersion.v6)
+                .modernKeyRing("Alice <alice@pgpainless.org>");
+        assertEquals(3, v6Key.getKeys().size());
+
+        byte[] revoked = sop.revokeKey()
+                .keys(v6Key.getEncoded())
+                .getBytes();
+
+        OpenPGPCertificate revocationCert = api.readKey().parseCertificate(revoked);
+        assertEquals(1, revocationCert.getKeys().size(),
+                "V6 keys are revoked using a minimal revocation cert," +
+                        " consisting only of the primary key and a rev sig.");
+    }
+}