diff --git a/pgpainless-core/src/test/java/org/pgpainless/algorithm/SignatureTypeTest.java b/pgpainless-core/src/test/java/org/pgpainless/algorithm/SignatureTypeTest.java
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+++ b/pgpainless-core/src/test/java/org/pgpainless/algorithm/SignatureTypeTest.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2021 Paul Schaub.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.pgpainless.algorithm;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+public class SignatureTypeTest {
+
+    @Test
+    public void isRevocationSignatureTest() {
+        assertTrue(SignatureType.isRevocationSignature(SignatureType.KEY_REVOCATION.getCode()));
+        assertTrue(SignatureType.isRevocationSignature(SignatureType.SUBKEY_REVOCATION.getCode()));
+        assertTrue(SignatureType.isRevocationSignature(SignatureType.CERTIFICATION_REVOCATION.getCode()));
+
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.BINARY_DOCUMENT.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.CASUAL_CERTIFICATION.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.NO_CERTIFICATION.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.POSITIVE_CERTIFICATION.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.GENERIC_CERTIFICATION.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.CANONICAL_TEXT_DOCUMENT.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.DIRECT_KEY.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.PRIMARYKEY_BINDING.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.SUBKEY_BINDING.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.THIRD_PARTY_CONFIRMATION.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.STANDALONE.getCode()));
+        assertFalse(SignatureType.isRevocationSignature(SignatureType.TIMESTAMP.getCode()));
+
+        assertThrows(IllegalArgumentException.class, () -> SignatureType.isRevocationSignature(-3));
+    }
+}