diff --git a/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java b/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java
index 295bc7b3..014cf0c0 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java
@@ -43,7 +43,7 @@ public final class Policy {
             CompressionAlgorithmPolicy.defaultCompressionAlgorithmPolicy();
     private final NotationRegistry notationRegistry = new NotationRegistry();
 
-    private Policy() {
+    Policy() {
     }
 
     /**
diff --git a/pgpainless-core/src/test/java/org/pgpainless/policy/PolicySetterTest.java b/pgpainless-core/src/test/java/org/pgpainless/policy/PolicySetterTest.java
new file mode 100644
index 00000000..1ef60ec3
--- /dev/null
+++ b/pgpainless-core/src/test/java/org/pgpainless/policy/PolicySetterTest.java
@@ -0,0 +1,53 @@
+/*
+ * 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.policy;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+public class PolicySetterTest {
+
+    @Test
+    public void testSetSignatureHashAlgorithmPolicy_NullFails() {
+        Policy policy = Policy.getInstance();
+        assertThrows(NullPointerException.class, () -> policy.setSignatureHashAlgorithmPolicy(null));
+    }
+
+    @Test
+    public void testSetRevocationSignatureHashAlgorithmPolicy_NullFails() {
+        Policy policy = Policy.getInstance();
+        assertThrows(NullPointerException.class, () -> policy.setRevocationSignatureHashAlgorithmPolicy(null));
+    }
+
+    @Test
+    public void testSetSymmetricKeyEncryptionAlgorithmPolicy_NullFails() {
+        Policy policy = Policy.getInstance();
+        assertThrows(NullPointerException.class, () -> policy.setSymmetricKeyEncryptionAlgorithmPolicy(null));
+    }
+
+    @Test
+    public void testSetSymmetricKeyDecryptionAlgorithmPolicy_NullFails() {
+        Policy policy = Policy.getInstance();
+        assertThrows(NullPointerException.class, () -> policy.setSymmetricKeyDecryptionAlgorithmPolicy(null));
+    }
+
+    @Test
+    public void testSetCompressionAlgorithmPolicy_NullFails() {
+        Policy policy = Policy.getInstance();
+        assertThrows(NullPointerException.class, () -> policy.setCompressionAlgorithmPolicy(null));
+    }
+}
diff --git a/pgpainless-core/src/test/java/org/pgpainless/policy/PolicyTest.java b/pgpainless-core/src/test/java/org/pgpainless/policy/PolicyTest.java
new file mode 100644
index 00000000..f8750581
--- /dev/null
+++ b/pgpainless-core/src/test/java/org/pgpainless/policy/PolicyTest.java
@@ -0,0 +1,139 @@
+/*
+ * 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.policy;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Arrays;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.pgpainless.algorithm.CompressionAlgorithm;
+import org.pgpainless.algorithm.HashAlgorithm;
+import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
+
+public class PolicyTest {
+
+    private static Policy policy;
+
+    @BeforeAll
+    public static void setup() {
+        policy = new Policy();
+        policy.setCompressionAlgorithmPolicy(new Policy.CompressionAlgorithmPolicy(CompressionAlgorithm.UNCOMPRESSED,
+                Arrays.asList(CompressionAlgorithm.ZIP, CompressionAlgorithm.ZLIB, CompressionAlgorithm.UNCOMPRESSED)));
+
+        policy.setSymmetricKeyEncryptionAlgorithmPolicy(new Policy.SymmetricKeyAlgorithmPolicy(SymmetricKeyAlgorithm.AES_256,
+                Arrays.asList(SymmetricKeyAlgorithm.AES_256, SymmetricKeyAlgorithm.AES_192, SymmetricKeyAlgorithm.AES_128)));
+
+        policy.setSymmetricKeyDecryptionAlgorithmPolicy(new Policy.SymmetricKeyAlgorithmPolicy(SymmetricKeyAlgorithm.AES_256,
+                Arrays.asList(SymmetricKeyAlgorithm.AES_256, SymmetricKeyAlgorithm.AES_192, SymmetricKeyAlgorithm.AES_128, SymmetricKeyAlgorithm.BLOWFISH)));
+
+        policy.setSignatureHashAlgorithmPolicy(new Policy.HashAlgorithmPolicy(HashAlgorithm.SHA512,
+                Arrays.asList(HashAlgorithm.SHA512, HashAlgorithm.SHA384, HashAlgorithm.SHA256)));
+
+        policy.setRevocationSignatureHashAlgorithmPolicy(new Policy.HashAlgorithmPolicy(HashAlgorithm.SHA512,
+                Arrays.asList(HashAlgorithm.SHA512, HashAlgorithm.SHA384, HashAlgorithm.SHA256, HashAlgorithm.SHA224, HashAlgorithm.SHA1)));
+    }
+
+    @Test
+    public void testAcceptableCompressionAlgorithm() {
+        assertTrue(policy.getCompressionAlgorithmPolicy().isAcceptable(CompressionAlgorithm.ZIP));
+        assertTrue(policy.getCompressionAlgorithmPolicy().isAcceptable(CompressionAlgorithm.ZIP.getAlgorithmId()));
+    }
+
+    @Test
+    public void testUnacceptableCompressionAlgorithm() {
+        assertFalse(policy.getCompressionAlgorithmPolicy().isAcceptable(CompressionAlgorithm.BZIP2));
+        assertFalse(policy.getCompressionAlgorithmPolicy().isAcceptable(CompressionAlgorithm.BZIP2.getAlgorithmId()));
+    }
+
+    @Test
+    public void testDefaultCompressionAlgorithm() {
+        assertEquals(CompressionAlgorithm.UNCOMPRESSED, policy.getCompressionAlgorithmPolicy().defaultCompressionAlgorithm());
+    }
+
+    @Test
+    public void testAcceptableSymmetricKeyEncryptionAlgorithm() {
+        assertTrue(policy.getSymmetricKeyEncryptionAlgorithmPolicy().isAcceptable(SymmetricKeyAlgorithm.AES_256));
+        assertTrue(policy.getSymmetricKeyEncryptionAlgorithmPolicy().isAcceptable(SymmetricKeyAlgorithm.AES_256.getAlgorithmId()));
+    }
+
+    @Test
+    public void testUnAcceptableSymmetricKeyEncryptionAlgorithm() {
+        assertFalse(policy.getSymmetricKeyEncryptionAlgorithmPolicy().isAcceptable(SymmetricKeyAlgorithm.BLOWFISH));
+        assertFalse(policy.getSymmetricKeyEncryptionAlgorithmPolicy().isAcceptable(SymmetricKeyAlgorithm.BLOWFISH.getAlgorithmId()));
+    }
+
+    @Test
+    public void testDefaultSymmetricKeyEncryptionAlgorithm() {
+        assertEquals(SymmetricKeyAlgorithm.AES_256, policy.getSymmetricKeyEncryptionAlgorithmPolicy().getDefaultSymmetricKeyAlgorithm());
+    }
+
+    @Test
+    public void testAcceptableSymmetricKeyDecryptionAlgorithm() {
+        assertTrue(policy.getSymmetricKeyDecryptionAlgoritmPolicy().isAcceptable(SymmetricKeyAlgorithm.BLOWFISH));
+        assertTrue(policy.getSymmetricKeyDecryptionAlgoritmPolicy().isAcceptable(SymmetricKeyAlgorithm.BLOWFISH.getAlgorithmId()));
+    }
+
+    @Test
+    public void testUnAcceptableSymmetricKeyDecryptionAlgorithm() {
+        assertFalse(policy.getSymmetricKeyDecryptionAlgoritmPolicy().isAcceptable(SymmetricKeyAlgorithm.CAMELLIA_128));
+        assertFalse(policy.getSymmetricKeyDecryptionAlgoritmPolicy().isAcceptable(SymmetricKeyAlgorithm.CAMELLIA_128.getAlgorithmId()));
+    }
+
+    @Test
+    public void testAcceptableSignatureHashAlgorithm() {
+        assertTrue(policy.getSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.SHA512));
+        assertTrue(policy.getSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.SHA512.getAlgorithmId()));
+    }
+
+    @Test
+    public void testUnacceptableSignatureHashAlgorithm() {
+        assertFalse(policy.getSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.SHA1));
+        assertFalse(policy.getSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.SHA1.getAlgorithmId()));
+    }
+
+    @Test
+    public void testDefaultSignatureHashAlgorithm() {
+        assertEquals(HashAlgorithm.SHA512, policy.getSignatureHashAlgorithmPolicy().defaultHashAlgorithm());
+    }
+
+    @Test
+    public void testAcceptableRevocationSignatureHashAlgorithm() {
+        assertTrue(policy.getRevocationSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.SHA384));
+        assertTrue(policy.getRevocationSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.SHA384.getAlgorithmId()));
+    }
+
+    @Test
+    public void testUnacceptableRevocationSignatureHashAlgorithm() {
+        assertFalse(policy.getRevocationSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.RIPEMD160));
+        assertFalse(policy.getRevocationSignatureHashAlgorithmPolicy().isAcceptable(HashAlgorithm.RIPEMD160.getAlgorithmId()));
+    }
+
+    @Test
+    public void testDefaultRevocationSignatureHashAlgorithm() {
+        assertEquals(HashAlgorithm.SHA512, policy.getRevocationSignatureHashAlgorithmPolicy().defaultHashAlgorithm());
+    }
+
+    @Test
+    public void testNotationRegistry() {
+        assertFalse(policy.getNotationRegistry().isKnownNotation("notation@pgpainless.org"));
+        policy.getNotationRegistry().addKnownNotation("notation@pgpainless.org");
+        assertTrue(policy.getNotationRegistry().isKnownNotation("notation@pgpainless.org"));
+    }
+}