diff --git a/libs/ui/Android.bp b/libs/ui/Android.bp
index ba5a64f..04ba485 100644
--- a/libs/ui/Android.bp
+++ b/libs/ui/Android.bp
@@ -86,6 +86,7 @@
 
     export_include_dirs: [
         "include",
+        "include_mock",
         "include_private",
         "include_types",
     ],
diff --git a/libs/ui/include/ui/Fence.h b/libs/ui/include/ui/Fence.h
index 6efecd3..7634007 100644
--- a/libs/ui/include/ui/Fence.h
+++ b/libs/ui/include/ui/Fence.h
@@ -26,6 +26,10 @@
 
 namespace android {
 
+namespace mock {
+class MockFence;
+}
+
 class String8;
 
 // ===========================================================================
@@ -109,7 +113,7 @@
     // fence transitioned to the signaled state.  If the fence is not signaled
     // then SIGNAL_TIME_PENDING is returned.  If the fence is invalid or if an
     // error occurs then SIGNAL_TIME_INVALID is returned.
-    nsecs_t getSignalTime() const;
+    virtual nsecs_t getSignalTime() const;
 
     enum class Status {
         Invalid,     // Fence is invalid
@@ -144,7 +148,10 @@
 private:
     // Only allow instantiation using ref counting.
     friend class LightRefBase<Fence>;
-    ~Fence() = default;
+    virtual ~Fence() = default;
+
+    // Allow mocking for unit testing
+    friend class mock::MockFence;
 
     base::unique_fd mFenceFd;
 };
diff --git a/libs/ui/include_mock/ui/MockFence.h b/libs/ui/include_mock/ui/MockFence.h
new file mode 100644
index 0000000..162ec02
--- /dev/null
+++ b/libs/ui/include_mock/ui/MockFence.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+#pragma once
+
+#include <gmock/gmock.h>
+#include <ui/Fence.h>
+
+namespace android::mock {
+
+class MockFence : public android::Fence {
+public:
+    MockFence() = default;
+    virtual ~MockFence() = default;
+
+    MOCK_METHOD(nsecs_t, getSignalTime, (), (const, override));
+};
+
+}; // namespace android::mock
diff --git a/libs/ui/tests/Android.bp b/libs/ui/tests/Android.bp
index 516aad8..a87740a 100644
--- a/libs/ui/tests/Android.bp
+++ b/libs/ui/tests/Android.bp
@@ -115,3 +115,12 @@
     srcs: ["Size_test.cpp"],
     cflags: ["-Wall", "-Werror"],
 }
+
+cc_test {
+    name: "MockFence_test",
+    shared_libs: ["libui"],
+    static_libs: ["libgmock"],
+    srcs: ["MockFence_test.cpp"],
+    cflags: ["-Wall", "-Werror"],
+}
+
diff --git a/libs/ui/tests/MockFence_test.cpp b/libs/ui/tests/MockFence_test.cpp
new file mode 100644
index 0000000..6e520b1
--- /dev/null
+++ b/libs/ui/tests/MockFence_test.cpp
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2021 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 <ui/MockFence.h>
+
+#include <gtest/gtest.h>
+
+namespace android::ui {
+
+using testing::Return;
+
+class MockFenceTest : public testing::Test {
+public:
+    sp<Fence> getFenceForTesting() const { return mMockFence; }
+
+    const mock::MockFence& getMockFence() const { return *mMockFence; }
+
+private:
+    sp<mock::MockFence> mMockFence = sp<mock::MockFence>::make();
+};
+
+TEST_F(MockFenceTest, getSignalTime) {
+    sp<Fence> fence = getFenceForTesting();
+
+    EXPECT_CALL(getMockFence(), getSignalTime).WillOnce(Return(Fence::SIGNAL_TIME_PENDING));
+    EXPECT_EQ(Fence::SIGNAL_TIME_PENDING, fence->getSignalTime());
+
+    EXPECT_CALL(getMockFence(), getSignalTime).WillOnce(Return(1234));
+    EXPECT_EQ(1234, fence->getSignalTime());
+}
+
+} // namespace android::ui