diff --git a/pgpainless-core/src/test/java/org/pgpainless/key/protection/PassphraseProtectedKeyTest.java b/pgpainless-core/src/test/java/org/pgpainless/key/protection/PassphraseProtectedKeyTest.java
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+++ b/pgpainless-core/src/test/java/org/pgpainless/key/protection/PassphraseProtectedKeyTest.java
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+/*
+ * 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 org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+import javax.annotation.Nullable;
+
+import org.bouncycastle.openpgp.PGPException;
+import org.junit.Test;
+import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
+import org.pgpainless.key.TestKeys;
+import org.pgpainless.util.Passphrase;
+
+public class PassphraseProtectedKeyTest {
+
+    /**
+     * Protector that holds only the password of cryptie.
+     */
+    private final PasswordBasedSecretKeyRingProtector protector = new PasswordBasedSecretKeyRingProtector(
+            new KeyRingProtectionSettings(SymmetricKeyAlgorithm.AES_256),
+            new SecretKeyPassphraseProvider() {
+                @Nullable
+                @Override
+                public Passphrase getPassphraseFor(Long keyId) {
+                    if (keyId == TestKeys.CRYPTIE_KEY_ID) {
+                        return new Passphrase(TestKeys.CRYPTIE_PASSWORD.toCharArray());
+                    } else {
+                        return null;
+                    }
+                }
+            });
+
+    @Test
+    public void testReturnsNonNullDecryptorEncryptorForPassword() throws PGPException {
+        assertNotNull(protector.getEncryptor(TestKeys.CRYPTIE_KEY_ID));
+        assertNotNull(protector.getDecryptor(TestKeys.CRYPTIE_KEY_ID));
+    }
+
+    @Test
+    public void testReturnsNullDecryptorEncryptorForNoPassword() throws PGPException {
+        assertNull(protector.getEncryptor(TestKeys.JULIET_KEY_ID));
+        assertNull(protector.getDecryptor(TestKeys.JULIET_KEY_ID));
+    }
+}