diff --git a/libs/ui/tests/Android.bp b/libs/ui/tests/Android.bp
index 28ef77a..032dd4c 100644
--- a/libs/ui/tests/Android.bp
+++ b/libs/ui/tests/Android.bp
@@ -85,6 +85,14 @@
 }
 
 cc_test {
+    name: "Rect_test",
+    test_suites: ["device-tests"],
+    shared_libs: ["libui"],
+    srcs: ["Rect_test.cpp"],
+    cflags: ["-Wall", "-Werror"],
+}
+
+cc_test {
     name: "Size_test",
     test_suites: ["device-tests"],
     shared_libs: ["libui"],
diff --git a/libs/ui/tests/Rect_test.cpp b/libs/ui/tests/Rect_test.cpp
new file mode 100644
index 0000000..5499a5b
--- /dev/null
+++ b/libs/ui/tests/Rect_test.cpp
@@ -0,0 +1,262 @@
+/*
+ * Copyright 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 <system/graphics.h>
+#include <ui/FloatRect.h>
+#include <ui/Point.h>
+#include <ui/Rect.h>
+#include <ui/Size.h>
+
+#include <gtest/gtest.h>
+
+namespace android::ui {
+
+TEST(RectTest, constructDefault) {
+    const Rect rect;
+    EXPECT_FALSE(rect.isValid());
+    EXPECT_TRUE(rect.isEmpty());
+}
+
+TEST(RectTest, constructFromWidthAndHeight) {
+    const Rect rect(100, 200);
+    EXPECT_TRUE(rect.isValid());
+    EXPECT_FALSE(rect.isEmpty());
+    EXPECT_EQ(0, rect.top);
+    EXPECT_EQ(0, rect.left);
+    EXPECT_EQ(100, rect.right);
+    EXPECT_EQ(200, rect.bottom);
+    EXPECT_EQ(100, rect.getWidth());
+    EXPECT_EQ(200, rect.getHeight());
+}
+
+TEST(RectTest, constructFromSize) {
+    const Rect rect(Size(100, 200));
+    EXPECT_TRUE(rect.isValid());
+    EXPECT_FALSE(rect.isEmpty());
+    EXPECT_EQ(0, rect.top);
+    EXPECT_EQ(0, rect.left);
+    EXPECT_EQ(100, rect.right);
+    EXPECT_EQ(200, rect.bottom);
+    EXPECT_EQ(100, rect.getWidth());
+    EXPECT_EQ(200, rect.getHeight());
+}
+
+TEST(RectTest, constructFromLTRB) {
+    const Rect rect(11, 12, 14, 14);
+    EXPECT_TRUE(rect.isValid());
+    EXPECT_FALSE(rect.isEmpty());
+    EXPECT_EQ(11, rect.left);
+    EXPECT_EQ(12, rect.top);
+    EXPECT_EQ(14, rect.right);
+    EXPECT_EQ(14, rect.bottom);
+    EXPECT_EQ(3, rect.getWidth());
+    EXPECT_EQ(2, rect.getHeight());
+}
+
+TEST(RectTest, constructFromPoints) {
+    const Rect rect(Point(11, 12), Point(14, 14));
+    EXPECT_TRUE(rect.isValid());
+    EXPECT_FALSE(rect.isEmpty());
+    EXPECT_EQ(11, rect.left);
+    EXPECT_EQ(12, rect.top);
+    EXPECT_EQ(14, rect.right);
+    EXPECT_EQ(14, rect.bottom);
+    EXPECT_EQ(3, rect.getWidth());
+    EXPECT_EQ(2, rect.getHeight());
+}
+
+TEST(RectTest, constructFromFloatRect) {
+    {
+        const Rect rect(FloatRect(10, 20, 30, 40));
+        EXPECT_TRUE(rect.isValid());
+        EXPECT_FALSE(rect.isEmpty());
+        EXPECT_EQ(10, rect.left);
+        EXPECT_EQ(20, rect.top);
+        EXPECT_EQ(30, rect.right);
+        EXPECT_EQ(40, rect.bottom);
+    }
+    // Construct with floating point error
+    {
+        constexpr float kError = 1e-3;
+        const Rect rect(FloatRect(10 - kError, 20 - kError, 30 - kError, 40 - kError));
+        EXPECT_TRUE(rect.isValid());
+        EXPECT_FALSE(rect.isEmpty());
+        EXPECT_EQ(10, rect.left);
+        EXPECT_EQ(20, rect.top);
+        EXPECT_EQ(30, rect.right);
+        EXPECT_EQ(40, rect.bottom);
+    }
+}
+
+TEST(RectTest, makeInvalid) {
+    Rect rect(10, 20, 60, 60);
+    EXPECT_TRUE(rect.isValid());
+    rect.makeInvalid();
+    EXPECT_FALSE(rect.isValid());
+}
+
+TEST(RectTest, clear) {
+    Rect rect(10, 20, 60, 60);
+    EXPECT_FALSE(rect.isEmpty());
+    rect.clear();
+    EXPECT_TRUE(rect.isEmpty());
+}
+
+TEST(RectTest, getSize) {
+    const Rect rect(10, 20, 60, 60);
+    EXPECT_EQ(Size(50, 40), rect.getSize());
+}
+
+TEST(RectTest, getBounds) {
+    const Rect rect(10, 20, 60, 60);
+    const Rect bounds = rect.getBounds();
+    EXPECT_EQ(0, bounds.left);
+    EXPECT_EQ(0, bounds.top);
+    EXPECT_EQ(50, bounds.right);
+    EXPECT_EQ(40, bounds.bottom);
+    EXPECT_EQ(rect.getSize(), bounds.getSize());
+}
+
+TEST(RectTest, getCornerPoints) {
+    const Rect rect(10, 20, 50, 60);
+    EXPECT_EQ(Point(10, 20), rect.leftTop());
+    EXPECT_EQ(Point(10, 60), rect.leftBottom());
+    EXPECT_EQ(Point(50, 20), rect.rightTop());
+    EXPECT_EQ(Point(50, 60), rect.rightBottom());
+}
+
+TEST(RectTest, operatorEquals) {
+    const Rect rect(10, 20, 50, 60);
+    EXPECT_EQ(rect, rect);
+    EXPECT_NE(Rect(0, 20, 50, 60), rect);
+    EXPECT_NE(Rect(10, 0, 50, 60), rect);
+    EXPECT_NE(Rect(10, 20, 0, 60), rect);
+    EXPECT_NE(Rect(10, 20, 50, 0), rect);
+}
+
+TEST(RectTest, operatorsPlusMinus) {
+    Rect rect = Rect(10, 20, 50, 60) + Point(1, 2);
+    EXPECT_EQ(Rect(11, 22, 51, 62), rect);
+    rect -= Point(1, 2);
+    EXPECT_EQ(Rect(10, 20, 50, 60), rect);
+
+    rect = Rect(10, 20, 50, 60) - Point(1, 2);
+    EXPECT_EQ(Rect(9, 18, 49, 58), rect);
+    rect += Point(1, 2);
+    EXPECT_EQ(Rect(10, 20, 50, 60), rect);
+}
+
+TEST(RectTest, scale) {
+    Rect rect(10, 20, 50, 60);
+    EXPECT_EQ(Rect(20, 60, 100, 180), rect.scale(2.f, 3.f));
+    rect.scaleSelf(2.f, 3.f);
+    EXPECT_EQ(Rect(20, 60, 100, 180), rect);
+
+    rect = Rect(10, 20, 50, 60);
+    constexpr float kError = 1e-3;
+    EXPECT_EQ(Rect(20, 60, 100, 180), rect.scale(2.f - kError, 3.f - kError));
+    rect.scaleSelf(2.f - kError, 3.f - kError);
+    EXPECT_EQ(Rect(20, 60, 100, 180), rect);
+}
+
+TEST(RectTest, inset) {
+    Rect rect(10, 20, 50, 60);
+    rect.inset(0, 0, 0, 0);
+    EXPECT_EQ(Rect(10, 20, 50, 60), rect);
+    rect.inset(1, 2, 3, 4);
+    EXPECT_EQ(Rect(11, 22, 47, 56), rect);
+}
+
+TEST(RectTest, intersect) {
+    const Rect rect(10, 20, 50, 60);
+    Rect intersection;
+
+    // Intersect with self is self
+    intersection.makeInvalid();
+    EXPECT_TRUE(rect.intersect(rect, &intersection));
+    EXPECT_EQ(Rect(10, 20, 50, 60), intersection);
+
+    // Intersect with rect contained in us
+    const Rect insideRect(11, 21, 45, 55);
+    intersection.makeInvalid();
+    EXPECT_TRUE(rect.intersect(insideRect, &intersection));
+    EXPECT_EQ(insideRect, intersection);
+
+    // Intersect with rect we are contained in
+    intersection.makeInvalid();
+    EXPECT_TRUE(insideRect.intersect(rect, &intersection));
+    EXPECT_EQ(insideRect, intersection);
+
+    // Empty intersection
+    intersection.makeInvalid();
+    EXPECT_FALSE(rect.intersect(Rect(100, 202, 150, 260), &intersection));
+    EXPECT_TRUE(intersection.isEmpty());
+
+    // Partial intersection
+    const Rect other(30, 40, 70, 80);
+    intersection.makeInvalid();
+    EXPECT_TRUE(rect.intersect(other, &intersection));
+    EXPECT_EQ(Rect(30, 40, 50, 60), intersection);
+
+    // Intersetion is commutative
+    intersection.makeInvalid();
+    EXPECT_TRUE(other.intersect(rect, &intersection));
+    EXPECT_EQ(Rect(30, 40, 50, 60), intersection);
+}
+
+TEST(RectTest, reduce) {
+    const Rect rect(10, 20, 50, 60);
+
+    // Reduce with self is empty
+    EXPECT_TRUE(rect.reduce(rect).isEmpty());
+
+    // Reduce with rect entirely inside is a noop
+    const Rect insideRect(11, 21, 45, 55);
+    EXPECT_EQ(rect, rect.reduce(insideRect));
+
+    // Reduce with rect entirely outside is empty
+    EXPECT_TRUE(insideRect.reduce(rect).isEmpty());
+
+    // Reduce with rect on the right
+    EXPECT_EQ(Rect(10, 20, 20, 60), rect.reduce(Rect(20, 0, 60, 70)));
+
+    // Reduce with rect on the left
+    EXPECT_EQ(Rect(40, 20, 50, 60), rect.reduce(Rect(0, 0, 40, 70)));
+
+    // Reduce with rect at the top
+    EXPECT_EQ(Rect(10, 40, 50, 60), rect.reduce(Rect(0, 0, 70, 40)));
+
+    // Reduce with rect at the bottom
+    EXPECT_EQ(Rect(10, 20, 50, 40), rect.reduce(Rect(0, 40, 70, 70)));
+}
+
+TEST(RectTest, transform) {
+    const int32_t width = 100, height = 200;
+    const Rect rect(1, 1, 2, 3);
+    EXPECT_EQ(Rect(98, 1, 99, 3), rect.transform(HAL_TRANSFORM_FLIP_H, width, height));
+    EXPECT_EQ(Rect(1, 197, 2, 199), rect.transform(HAL_TRANSFORM_FLIP_V, width, height));
+    EXPECT_EQ(Rect(197, 1, 199, 2), rect.transform(HAL_TRANSFORM_ROT_90, width, height));
+    EXPECT_EQ(Rect(98, 197, 99, 199), rect.transform(HAL_TRANSFORM_ROT_180, width, height));
+    EXPECT_EQ(Rect(1, 98, 3, 99), rect.transform(HAL_TRANSFORM_ROT_270, width, height));
+}
+
+TEST(RectTest, toFloatRect) {
+    const Rect rect(10, 20, 50, 60);
+    const FloatRect floatRect = rect.toFloatRect();
+    EXPECT_EQ(FloatRect(10.f, 20.f, 50.f, 60.f), floatRect);
+}
+
+} // namespace android::ui
diff --git a/libs/ui/tests/Size_test.cpp b/libs/ui/tests/Size_test.cpp
index 38f37ad..5f75aea 100644
--- a/libs/ui/tests/Size_test.cpp
+++ b/libs/ui/tests/Size_test.cpp
@@ -33,8 +33,7 @@
 
 #include <gtest/gtest.h>
 
-namespace android {
-namespace ui {
+namespace android::ui {
 
 TEST(SizeTest, BasicConstructionAndEqualityComparison) {
     Size s(123, 456);
@@ -215,5 +214,4 @@
     ClampTest(uint32_t(0), int32_t(0));
 }
 
-} // namespace ui
-} // namespace android
+} // namespace android::ui
diff --git a/libs/ui/tests/TEST_MAPPING b/libs/ui/tests/TEST_MAPPING
index 7fcd7de..eece18e 100644
--- a/libs/ui/tests/TEST_MAPPING
+++ b/libs/ui/tests/TEST_MAPPING
@@ -2,6 +2,9 @@
   "presubmit": [
     {
       "name": "Size_test"
+    },
+    {
+      "name": "Rect_test"
     }
   ]
 }