diff --git a/pgpainless-core/src/test/java/org/pgpainless/key/protection/UnprotectedKeysProtectorTest.java b/pgpainless-core/src/test/java/org/pgpainless/key/protection/UnprotectedKeysProtectorTest.java
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--- /dev/null
+++ b/pgpainless-core/src/test/java/org/pgpainless/key/protection/UnprotectedKeysProtectorTest.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2020 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.key.protection;
+
+import static junit.framework.TestCase.assertNull;
+
+import org.junit.Test;
+
+public class UnprotectedKeysProtectorTest {
+
+    private UnprotectedKeysProtector protector = new UnprotectedKeysProtector();
+
+    @Test
+    public void testKeyProtectorReturnsNullDecryptor() {
+        assertNull(protector.getDecryptor(0L));
+    }
+
+    @Test
+    public void testKeyProtectorReturnsNullEncryptor() {
+        assertNull(protector.getEncryptor(0L));
+    }
+}