diff --git a/excluder_chromeos_unittest.cc b/excluder_chromeos_unittest.cc
new file mode 100644
index 0000000..a8c14b3
--- /dev/null
+++ b/excluder_chromeos_unittest.cc
@@ -0,0 +1,66 @@
+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// 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 "update_engine/excluder_chromeos.h"
+
+#include <memory>
+
+#include <base/files/file_util.h>
+#include <base/files/scoped_temp_dir.h>
+#include <gtest/gtest.h>
+
+#include "update_engine/common/prefs.h"
+
+using std::string;
+using std::unique_ptr;
+
+namespace chromeos_update_engine {
+
+constexpr char kDummyHash[] =
+    "71ff43d76e2488e394e46872f5b066cc25e394c2c3e3790dd319517883b33db1";
+
+class ExcluderChromeOSTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    ASSERT_TRUE(tempdir_.CreateUniqueTempDir());
+    ASSERT_TRUE(base::PathExists(tempdir_.GetPath()));
+    ASSERT_TRUE(prefs_.Init(tempdir_.GetPath()));
+    excluder_ = std::make_unique<ExcluderChromeOS>(&prefs_);
+  }
+
+  base::ScopedTempDir tempdir_;
+  Prefs prefs_;
+  unique_ptr<ExcluderChromeOS> excluder_;
+};
+
+TEST_F(ExcluderChromeOSTest, ExclusionCheck) {
+  EXPECT_FALSE(excluder_->IsExcluded(kDummyHash));
+  EXPECT_TRUE(excluder_->Exclude(kDummyHash));
+  EXPECT_TRUE(excluder_->IsExcluded(kDummyHash));
+}
+
+TEST_F(ExcluderChromeOSTest, ResetFlow) {
+  EXPECT_TRUE(excluder_->Exclude("abc"));
+  EXPECT_TRUE(excluder_->Exclude(kDummyHash));
+  EXPECT_TRUE(excluder_->IsExcluded("abc"));
+  EXPECT_TRUE(excluder_->IsExcluded(kDummyHash));
+
+  EXPECT_TRUE(excluder_->Reset());
+  EXPECT_FALSE(excluder_->IsExcluded("abc"));
+  EXPECT_FALSE(excluder_->IsExcluded(kDummyHash));
+}
+
+}  // namespace chromeos_update_engine