diff --git a/test/manager_open_unittest.cpp b/test/manager_open_unittest.cpp
new file mode 100644
index 0000000..309d3f6
--- /dev/null
+++ b/test/manager_open_unittest.cpp
@@ -0,0 +1,85 @@
+#include "blob_mock.hpp"
+#include "manager.hpp"
+
+#include <string>
+
+#include <gtest/gtest.h>
+
+namespace blobs
+{
+
+using ::testing::_;
+using ::testing::Return;
+
+TEST(ManagerOpenTest, OpenButNoHandler)
+{
+    // No handler claims to be able to open the file.
+
+    BlobManager mgr;
+    std::unique_ptr<BlobMock> m1 = std::make_unique<BlobMock>();
+    auto m1ptr = m1.get();
+    EXPECT_TRUE(mgr.registerHandler(std::move(m1)));
+
+    uint16_t flags = OpenFlags::read, sess;
+    std::string path = "/asdf/asdf";
+
+    EXPECT_CALL(*m1ptr, canHandleBlob(path)).WillOnce(Return(false));
+    EXPECT_FALSE(mgr.open(flags, path, &sess));
+}
+
+TEST(ManagerOpenTest, OpenButHandlerFailsOpen)
+{
+    // The handler is found but Open fails.
+
+    BlobManager mgr;
+    std::unique_ptr<BlobMock> m1 = std::make_unique<BlobMock>();
+    auto m1ptr = m1.get();
+    EXPECT_TRUE(mgr.registerHandler(std::move(m1)));
+
+    uint16_t flags = OpenFlags::read, sess;
+    std::string path = "/asdf/asdf";
+
+    EXPECT_CALL(*m1ptr, canHandleBlob(path)).WillOnce(Return(true));
+    EXPECT_CALL(*m1ptr, open(_, flags, path)).WillOnce(Return(false));
+    EXPECT_FALSE(mgr.open(flags, path, &sess));
+}
+
+TEST(ManagerOpenTest, OpenFailsMustSupplyAtLeastReadOrWriteFlag)
+{
+    // One must supply either read or write in the flags for the session to
+    // open.
+
+    BlobManager mgr;
+    std::unique_ptr<BlobMock> m1 = std::make_unique<BlobMock>();
+    auto m1ptr = m1.get();
+    EXPECT_TRUE(mgr.registerHandler(std::move(m1)));
+
+    uint16_t flags = 0, sess;
+    std::string path = "/asdf/asdf";
+
+    /* It checks if someone can handle the blob before it checks the flags. */
+    EXPECT_CALL(*m1ptr, canHandleBlob(path)).WillOnce(Return(true));
+
+    EXPECT_FALSE(mgr.open(flags, path, &sess));
+}
+
+TEST(ManagerOpenTest, OpenSucceeds)
+{
+    // The handler is found and Open succeeds.
+
+    BlobManager mgr;
+    std::unique_ptr<BlobMock> m1 = std::make_unique<BlobMock>();
+    auto m1ptr = m1.get();
+    EXPECT_TRUE(mgr.registerHandler(std::move(m1)));
+
+    uint16_t flags = OpenFlags::read, sess;
+    std::string path = "/asdf/asdf";
+
+    EXPECT_CALL(*m1ptr, canHandleBlob(path)).WillOnce(Return(true));
+    EXPECT_CALL(*m1ptr, open(_, flags, path)).WillOnce(Return(true));
+    EXPECT_TRUE(mgr.open(flags, path, &sess));
+
+    // TODO(venture): Need a way to verify the session is associated with it,
+    // maybe just call Read() or SessionStat()
+}
+} // namespace blobs