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diff --git a/ink_stroke_modeler/internal/type_matchers.h b/ink_stroke_modeler/internal/type_matchers.h
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+/*
+ * Copyright 2022 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 INK_STROKE_MODELER_INTERNAL_TYPE_MATCHERS_H_
+#define INK_STROKE_MODELER_INTERNAL_TYPE_MATCHERS_H_
+
+#include "gtest/gtest.h"
+#include "ink_stroke_modeler/internal/internal_types.h"
+#include "ink_stroke_modeler/types.h"
+
+namespace ink {
+namespace stroke_model {
+
+// These matchers compare Vec2s component-wise, delegating to
+// ::testing::FloatEq() and ::testing::FloatNear(), respectively.
+::testing::Matcher<Vec2> Vec2Eq(const Vec2 v);
+::testing::Matcher<Vec2> Vec2Near(const Vec2 v, float tolerance);
+
+// These convenience matchers perform comparisons using ::testing::FloatNear(),
+// ::testing::DoubleNear(), and Vec2Near().
+::testing::Matcher<TipState> TipStateNear(const TipState &expected,
+                                          float tolerance);
+::testing::Matcher<StylusState> StylusStateNear(const StylusState &expected,
+                                                float tolerance);
+
+}  // namespace stroke_model
+}  // namespace ink
+
+#endif  // INK_STROKE_MODELER_INTERNAL_TYPE_MATCHERS_H_