diff --git a/src/test/estoraged_test.cpp b/src/test/estoraged_test.cpp
index 0bbb32b..9fde533 100644
--- a/src/test/estoraged_test.cpp
+++ b/src/test/estoraged_test.cpp
@@ -452,4 +452,46 @@
     EXPECT_FALSE(esObject->isLocked());
 }
 
+/* Test case where we successfully change the password. */
+TEST_F(EStoragedTest, ChangePasswordSuccess)
+{
+    std::string newPasswordString("newPassword");
+    std::vector<uint8_t> newPassword(newPasswordString.begin(),
+                                     newPasswordString.end());
+
+    EXPECT_CALL(*mockCryptIface, cryptLoad(_, _, _)).Times(1);
+
+    EXPECT_CALL(*mockCryptIface,
+                cryptKeyslotChangeByPassphrase(
+                    _, _, _, reinterpret_cast<const char*>(password.data()),
+                    password.size(),
+                    reinterpret_cast<const char*>(newPassword.data()),
+                    newPassword.size()))
+        .WillOnce(Return(0));
+
+    /* Change the password for the LUKS-encrypted device. */
+    esObject->changePassword(password, newPassword);
+}
+
+/* Test case where we fail to change the password. */
+TEST_F(EStoragedTest, ChangePasswordFail)
+{
+    std::string newPasswordString("newPassword");
+    std::vector<uint8_t> newPassword(newPasswordString.begin(),
+                                     newPasswordString.end());
+
+    EXPECT_CALL(*mockCryptIface, cryptLoad(_, _, _)).Times(1);
+
+    EXPECT_CALL(*mockCryptIface,
+                cryptKeyslotChangeByPassphrase(
+                    _, _, _, reinterpret_cast<const char*>(password.data()),
+                    password.size(),
+                    reinterpret_cast<const char*>(newPassword.data()),
+                    newPassword.size()))
+        .WillOnce(Return(-1));
+
+    EXPECT_THROW(esObject->changePassword(password, newPassword),
+                 InternalFailure);
+}
+
 } // namespace estoraged_test
diff --git a/src/test/include/estoraged_test.hpp b/src/test/include/estoraged_test.hpp
index ebd9e11..6809c37 100644
--- a/src/test/include/estoraged_test.hpp
+++ b/src/test/include/estoraged_test.hpp
@@ -59,6 +59,12 @@
                  void* params),
                 (override));
 
+    MOCK_METHOD(int, cryptKeyslotChangeByPassphrase,
+                (struct crypt_device * cd, int keyslotOld, int keyslotNew,
+                 const char* passphrase, size_t passphraseSize,
+                 const char* newPassphrase, size_t newPassphraseSize),
+                (override));
+
     MOCK_METHOD(int, cryptActivateByPassphrase,
                 (struct crypt_device * cd, const char* name, int keyslot,
                  const char* passphrase, size_t passphrase_size,