diff --git a/test/firmware_state_updatecompleted_unittest.cpp b/test/firmware_state_updatecompleted_unittest.cpp
index c686ae1..37f228c 100644
--- a/test/firmware_state_updatecompleted_unittest.cpp
+++ b/test/firmware_state_updatecompleted_unittest.cpp
@@ -5,3 +5,69 @@
  * This can be reached with success or failure from an update, and is reached
  * via a stat() call from updatedStarted.
  */
+#include "firmware_handler.hpp"
+#include "firmware_unittest.hpp"
+#include "status.hpp"
+#include "util.hpp"
+
+#include <string>
+#include <vector>
+
+#include <gtest/gtest.h>
+
+namespace ipmi_flash
+{
+namespace
+{
+
+/*
+ * There are the following calls (parameters may vary):
+ * canHandleBlob(blob)
+ * getBlobIds
+ * deleteBlob(blob)
+ * stat(blob)
+ * stat(session)
+ * open(blob)
+ * close(session)
+ * writemeta(session)
+ * write(session)
+ * read(session)
+ * commit(session)
+ */
+
+class FirmwareHandlerUpdateCompletedTest : public IpmiOnlyFirmwareStaticTest
+{
+};
+
+/*
+ * open(blob)
+ */
+TEST_F(FirmwareHandlerUpdateCompletedTest,
+       AttemptToOpenFilesReturnsFailureAfterSuccess)
+{
+    /* In state updateCompleted a file is open, which means no others can be. */
+    getToUpdateCompleted(UpdateStatus::success);
+
+    auto blobsToOpen = handler->getBlobIds();
+    for (const auto& blob : blobsToOpen)
+    {
+        EXPECT_FALSE(handler->open(session + 1, flags, blob));
+    }
+}
+
+/*
+ * There are the following calls (parameters may vary):
+ * canHandleBlob(blob)
+ * getBlobIds
+ * deleteBlob(blob)
+ * stat(blob)
+ * stat(session)
+ * close(session)
+ * writemeta(session)
+ * write(session)
+ * read(session)
+ * commit(session)
+ */
+
+} // namespace
+} // namespace ipmi_flash
diff --git a/test/firmware_unittest.hpp b/test/firmware_unittest.hpp
index d077818..947c2ba 100644
--- a/test/firmware_unittest.hpp
+++ b/test/firmware_unittest.hpp
@@ -103,6 +103,16 @@
         expectedState(FirmwareBlobHandler::UpdateState::updateStarted);
     }
 
+    void getToUpdateCompleted(UpdateStatus result)
+    {
+        getToUpdateStarted();
+        EXPECT_CALL(*updateMockPtr, status()).WillOnce(Return(result));
+
+        blobs::BlobMeta meta;
+        EXPECT_TRUE(handler->stat(session, &meta));
+        expectedState(FirmwareBlobHandler::UpdateState::updateCompleted);
+    }
+
     ImageHandlerMock imageMock;
     std::vector<HandlerPack> blobs;
     std::vector<DataHandlerPack> data = {