diff --git a/test/ipmi_open_unittest.cpp b/test/ipmi_open_unittest.cpp
new file mode 100644
index 0000000..db2a34f
--- /dev/null
+++ b/test/ipmi_open_unittest.cpp
@@ -0,0 +1,108 @@
+#include "ipmi.hpp"
+#include "manager_mock.hpp"
+
+#include <cstring>
+#include <string>
+
+#include <gtest/gtest.h>
+
+namespace blobs
+{
+
+using ::testing::_;
+using ::testing::Invoke;
+using ::testing::NotNull;
+using ::testing::Return;
+using ::testing::StrEq;
+
+// ipmid.hpp isn't installed where we can grab it and this value is per BMC
+// SoC.
+#define MAX_IPMI_BUFFER 64
+
+TEST(BlobOpenTest, InvalidRequestLengthReturnsFailure)
+{
+    // There is a minimum blobId length of one character, this test verifies
+    // we check that.
+
+    ManagerMock mgr;
+    size_t dataLen;
+    uint8_t request[MAX_IPMI_BUFFER] = {0};
+    uint8_t reply[MAX_IPMI_BUFFER] = {0};
+    auto req = reinterpret_cast<struct BmcBlobOpenTx*>(request);
+    std::string blobId = "abc";
+
+    req->cmd = BlobOEMCommands::bmcBlobOpen;
+    req->crc = 0;
+    req->flags = 0;
+    // length() doesn't include the nul-terminator.
+    std::memcpy(req->blobId, blobId.c_str(), blobId.length());
+
+    dataLen = sizeof(struct BmcBlobOpenTx) + blobId.length();
+
+    EXPECT_EQ(IPMI_CC_INVALID, openBlob(&mgr, request, reply, &dataLen));
+}
+
+TEST(BlobOpenTest, RequestRejectedReturnsFailure)
+{
+    // The blobId is rejected for any reason.
+
+    ManagerMock mgr;
+    size_t dataLen;
+    uint8_t request[MAX_IPMI_BUFFER] = {0};
+    uint8_t reply[MAX_IPMI_BUFFER] = {0};
+    auto req = reinterpret_cast<struct BmcBlobOpenTx*>(request);
+    std::string blobId = "a";
+
+    req->cmd = BlobOEMCommands::bmcBlobOpen;
+    req->crc = 0;
+    req->flags = 0;
+    // length() doesn't include the nul-terminator, request buff is initialized
+    // to 0s
+    std::memcpy(req->blobId, blobId.c_str(), blobId.length());
+
+    dataLen = sizeof(struct BmcBlobOpenTx) + blobId.length() + 1;
+
+    EXPECT_CALL(mgr, open(req->flags, StrEq(blobId), _))
+        .WillOnce(Return(false));
+
+    EXPECT_EQ(IPMI_CC_INVALID, openBlob(&mgr, request, reply, &dataLen));
+}
+
+TEST(BlobOpenTest, BlobOpenReturnsOk)
+{
+    // The boring case where the blobId opens.
+
+    ManagerMock mgr;
+    size_t dataLen;
+    uint8_t request[MAX_IPMI_BUFFER] = {0};
+    uint8_t reply[MAX_IPMI_BUFFER] = {0};
+    auto req = reinterpret_cast<struct BmcBlobOpenTx*>(request);
+    struct BmcBlobOpenRx rep;
+    std::string blobId = "a";
+
+    req->cmd = BlobOEMCommands::bmcBlobOpen;
+    req->crc = 0;
+    req->flags = 0;
+    // length() doesn't include the nul-terminator, request buff is initialized
+    // to 0s
+    std::memcpy(req->blobId, blobId.c_str(), blobId.length());
+
+    dataLen = sizeof(struct BmcBlobOpenTx) + blobId.length() + 1;
+    uint16_t returnedSession = 0x54;
+
+    EXPECT_CALL(mgr, open(req->flags, StrEq(blobId), NotNull()))
+        .WillOnce(Invoke(
+            [&](uint16_t flags, const std::string& path, uint16_t* session) {
+                (*session) = returnedSession;
+                return true;
+            }));
+
+    EXPECT_EQ(IPMI_CC_OK, openBlob(&mgr, request, reply, &dataLen));
+
+    rep.crc = 0;
+    rep.sessionId = returnedSession;
+
+    EXPECT_EQ(sizeof(rep), dataLen);
+    EXPECT_EQ(0, std::memcmp(reply, &rep, sizeof(rep)));
+}
+} // namespace blobs