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diff --git a/Firestore/Example/Tests/Model/transform_operations_test.mm b/Firestore/Example/Tests/Model/transform_operations_test.mm
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+/*
+ * Copyright 2018 Google
+ *
+ * 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.
+ */
+
+#include "Firestore/core/src/firebase/firestore/model/transform_operations.h"
+
+#include "gtest/gtest.h"
+
+namespace firebase {
+namespace firestore {
+namespace model {
+
+class DummyOperation : public TransformOperation {
+ public:
+  DummyOperation() {
+  }
+
+  Type type() const override {
+    return Type::Test;
+  }
+
+  FSTFieldValue* ApplyToLocalView(FSTFieldValue* /* previousValue */,
+                                  FIRTimestamp* /* localWriteTime */) const override {
+    return nil;
+  }
+
+  FSTFieldValue* ApplyToRemoteDocument(FSTFieldValue* /* previousValue */,
+                                       FSTFieldValue* /* transformResult */) const override {
+    return nil;
+  }
+
+  bool operator==(const TransformOperation& other) const override {
+    return this == &other;
+  }
+
+  NSUInteger Hash() const override {
+    // arbitrary number, the same as used in ObjC implementation, since all
+    // instances are equal.
+    return 37;
+  }
+};
+
+TEST(TransformOperations, ServerTimestamp) {
+  ServerTimestampTransform transform = ServerTimestampTransform::Get();
+  EXPECT_EQ(TransformOperation::Type::ServerTimestamp, transform.type());
+
+  ServerTimestampTransform another = ServerTimestampTransform::Get();
+  DummyOperation dummy;
+  EXPECT_EQ(transform, another);
+  EXPECT_NE(transform, dummy);
+}
+
+// TODO(mikelehen): Add ArrayTransform test once it no longer depends on
+// FSTFieldValue and can be exposed to C++ code.
+
+}  // namespace model
+}  // namespace firestore
+}  // namespace firebase