diff --git a/pgpainless-core/src/test/java/org/pgpainless/algorithm/SignatureSubpacketTest.java b/pgpainless-core/src/test/java/org/pgpainless/algorithm/SignatureSubpacketTest.java
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+++ b/pgpainless-core/src/test/java/org/pgpainless/algorithm/SignatureSubpacketTest.java
@@ -0,0 +1,40 @@
+/*
+ * 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.assertEquals;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+public class SignatureSubpacketTest {
+
+    @Test
+    public void testFromCodes() {
+        int[] codes = new int[] {
+                SignatureSubpacket.issuerKeyId.getCode(),
+                SignatureSubpacket.preferredSymmetricAlgorithms.getCode(),
+                SignatureSubpacket.preferredHashAlgorithms.getCode()
+        };
+
+        List<SignatureSubpacket> subpacketList = SignatureSubpacket.fromCodes(codes);
+        assertEquals(3, subpacketList.size());
+        assertEquals(SignatureSubpacket.issuerKeyId, subpacketList.get(0));
+        assertEquals(SignatureSubpacket.preferredSymmetricAlgorithms, subpacketList.get(1));
+        assertEquals(SignatureSubpacket.preferredHashAlgorithms, subpacketList.get(2));
+    }
+}