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diff --git a/fcp/secagg/testing/test_matchers.h b/fcp/secagg/testing/test_matchers.h
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+/*
+ * Copyright 2019 Google LLC
+ *
+ * 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.
+ */
+
+#ifndef FCP_SECAGG_TESTING_TEST_MATCHERS_H_
+#define FCP_SECAGG_TESTING_TEST_MATCHERS_H_
+
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "gmock/gmock.h"
+#include "absl/container/node_hash_map.h"
+#include "fcp/secagg/shared/secagg_vector.h"
+
+namespace fcp {
+namespace secagg {
+namespace testing {
+
+using SecAggVectorData = std::pair<int, std::vector<uint64_t> >;
+using SecAggVectorDataMap = absl::node_hash_map<std::string, SecAggVectorData>;
+
+class SecAggVectorMapMatcher {
+ public:
+  explicit SecAggVectorMapMatcher(SecAggVectorDataMap expected)
+      : expected_(expected) {}
+  // Intentionally allowed to be implicit.
+  operator ::testing::Matcher<const SecAggVectorMap&>() const;  // NOLINT
+
+ private:
+  SecAggVectorDataMap expected_;
+};
+
+SecAggVectorMapMatcher MatchesSecAggVectorMap(const SecAggVectorMap& expected);
+SecAggVectorMapMatcher MatchesSecAggVector(const std::string& name,
+                                           const SecAggVector& vector);
+
+}  // namespace testing
+}  // namespace secagg
+}  // namespace fcp
+
+#endif  // FCP_SECAGG_TESTING_TEST_MATCHERS_H_