diff --git a/separate_rects.cpp b/separate_rects.cpp
index 9fd1ae4..0e74cfc 100644
--- a/separate_rects.cpp
+++ b/separate_rects.cpp
@@ -315,102 +315,3 @@
 }
 
 }  // namespace separate_rects
-
-#ifdef RECTS_TEST
-
-using namespace separate_rects;
-
-int main(int argc, char **argv) {
-#define RectSet RectSet<TId, TNum>
-#define Rect Rect<TNum>
-#define IdSet IdSet<TId>
-  typedef uint64_t TId;
-  typedef float TNum;
-
-  std::vector<Rect> in;
-  std::vector<RectSet> out;
-  std::vector<RectSet> expected_out;
-
-  in.push_back({0, 0, 4, 5});
-  in.push_back({2, 0, 6, 6});
-  in.push_back({4, 0, 8, 5});
-  in.push_back({0, 7, 8, 9});
-
-  in.push_back({10, 0, 18, 5});
-  in.push_back({12, 0, 16, 5});
-
-  in.push_back({20, 11, 24, 17});
-  in.push_back({22, 13, 26, 21});
-  in.push_back({32, 33, 36, 37});
-  in.push_back({30, 31, 38, 39});
-
-  in.push_back({40, 43, 48, 45});
-  in.push_back({44, 41, 46, 47});
-
-  in.push_back({50, 51, 52, 53});
-  in.push_back({50, 51, 52, 53});
-  in.push_back({50, 51, 52, 53});
-
-  in.push_back({0, 0, 0, 10});
-  in.push_back({0, 0, 10, 0});
-  in.push_back({10, 0, 0, 10});
-  in.push_back({0, 10, 10, 0});
-
-  for (int i = 0; i < 100000; i++) {
-    out.clear();
-    separate_rects(in, &out);
-  }
-
-  for (int i = 0; i < out.size(); i++) {
-    std::cout << out[i].id_set << "(" << out[i].rect << ")" << std::endl;
-  }
-
-  std::cout << "# of rects: " << out.size() << std::endl;
-
-  expected_out.push_back(RectSet(IdSet(0), Rect(0, 0, 2, 5)));
-  expected_out.push_back(RectSet(IdSet(1), Rect(2, 5, 6, 6)));
-  expected_out.push_back(RectSet(IdSet(1) | 0, Rect(2, 0, 4, 5)));
-  expected_out.push_back(RectSet(IdSet(1) | 2, Rect(4, 0, 6, 5)));
-  expected_out.push_back(RectSet(IdSet(2), Rect(6, 0, 8, 5)));
-  expected_out.push_back(RectSet(IdSet(3), Rect(0, 7, 8, 9)));
-  expected_out.push_back(RectSet(IdSet(4), Rect(10, 0, 12, 5)));
-  expected_out.push_back(RectSet(IdSet(5) | 4, Rect(12, 0, 16, 5)));
-  expected_out.push_back(RectSet(IdSet(4), Rect(16, 0, 18, 5)));
-  expected_out.push_back(RectSet(IdSet(6), Rect(20, 11, 22, 17)));
-  expected_out.push_back(RectSet(IdSet(6) | 7, Rect(22, 13, 24, 17)));
-  expected_out.push_back(RectSet(IdSet(6), Rect(22, 11, 24, 13)));
-  expected_out.push_back(RectSet(IdSet(7), Rect(22, 17, 24, 21)));
-  expected_out.push_back(RectSet(IdSet(7), Rect(24, 13, 26, 21)));
-  expected_out.push_back(RectSet(IdSet(9), Rect(30, 31, 32, 39)));
-  expected_out.push_back(RectSet(IdSet(8) | 9, Rect(32, 33, 36, 37)));
-  expected_out.push_back(RectSet(IdSet(9), Rect(32, 37, 36, 39)));
-  expected_out.push_back(RectSet(IdSet(9), Rect(32, 31, 36, 33)));
-  expected_out.push_back(RectSet(IdSet(9), Rect(36, 31, 38, 39)));
-  expected_out.push_back(RectSet(IdSet(10), Rect(40, 43, 44, 45)));
-  expected_out.push_back(RectSet(IdSet(10) | 11, Rect(44, 43, 46, 45)));
-  expected_out.push_back(RectSet(IdSet(11), Rect(44, 41, 46, 43)));
-  expected_out.push_back(RectSet(IdSet(11), Rect(44, 45, 46, 47)));
-  expected_out.push_back(RectSet(IdSet(10), Rect(46, 43, 48, 45)));
-  expected_out.push_back(RectSet(IdSet(12) | 13 | 14, Rect(50, 51, 52, 53)));
-
-  for (int i = 0; i < expected_out.size(); i++) {
-    RectSet &ex_out = expected_out[i];
-    if (std::find(out.begin(), out.end(), ex_out) == out.end()) {
-      std::cout << "Missing Rect: " << ex_out.id_set << "(" << ex_out.rect
-                << ")" << std::endl;
-    }
-  }
-
-  for (int i = 0; i < out.size(); i++) {
-    RectSet &actual_out = out[i];
-    if (std::find(expected_out.begin(), expected_out.end(), actual_out) ==
-        expected_out.end()) {
-      std::cout << "Extra Rect: " << actual_out.id_set << "(" << actual_out.rect
-                << ")" << std::endl;
-    }
-  }
-
-  return 0;
-}
-
-#endif
diff --git a/tests/Android.mk b/tests/Android.mk
index 5bbda93..3b9e0a2 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -3,10 +3,12 @@
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := \
+	separate_rects_test.cpp \
 	worker_test.cpp
 
 LOCAL_MODULE := hwc-drm-tests
 LOCAL_STATIC_LIBRARIES := libdrmhwc_utils
+LOCAL_SHARED_LIBRARIES := hwcomposer.drm
 LOCAL_C_INCLUDES := external/drm_hwcomposer
 
 include $(BUILD_NATIVE_TEST)
diff --git a/tests/separate_rects_test.cpp b/tests/separate_rects_test.cpp
new file mode 100644
index 0000000..d9595dd
--- /dev/null
+++ b/tests/separate_rects_test.cpp
@@ -0,0 +1,100 @@
+#include <gtest/gtest.h>
+#include <hardware/hardware.h>
+
+#include "separate_rects.h"
+
+using namespace separate_rects;
+
+#define RectSet RectSet<TId, TNum>
+#define Rect Rect<TNum>
+#define IdSet IdSet<TId>
+typedef uint64_t TId;
+typedef float TNum;
+
+struct SeparateRectTest : public testing::Test {
+  bool IsEquality(std::vector<RectSet> &out,
+                  std::vector<RectSet> &expected_out) {
+    // Test for rects missing from out
+    for (size_t i = 0; i < expected_out.size(); i++) {
+      RectSet &ex_out = expected_out[i];
+      if (std::find(out.begin(), out.end(), ex_out) == out.end()) {
+        return false;
+      }
+    }
+
+    // Test for presence of unexpected rects in out
+    for (size_t i = 0; i < out.size(); i++) {
+      RectSet &actual_out = out[i];
+      if (std::find(expected_out.begin(), expected_out.end(), actual_out) ==
+          expected_out.end()) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+};
+
+TEST_F(SeparateRectTest, test_separate_rect) {
+  std::vector<Rect> in;
+  std::vector<RectSet> out;
+  std::vector<RectSet> expected_out;
+
+  in.push_back({0, 0, 4, 5});
+  in.push_back({2, 0, 6, 6});
+  in.push_back({4, 0, 8, 5});
+  in.push_back({0, 7, 8, 9});
+
+  in.push_back({10, 0, 18, 5});
+  in.push_back({12, 0, 16, 5});
+
+  in.push_back({20, 11, 24, 17});
+  in.push_back({22, 13, 26, 21});
+  in.push_back({32, 33, 36, 37});
+  in.push_back({30, 31, 38, 39});
+
+  in.push_back({40, 43, 48, 45});
+  in.push_back({44, 41, 46, 47});
+
+  in.push_back({50, 51, 52, 53});
+  in.push_back({50, 51, 52, 53});
+  in.push_back({50, 51, 52, 53});
+
+  in.push_back({0, 0, 0, 10});
+  in.push_back({0, 0, 10, 0});
+  in.push_back({10, 0, 0, 10});
+  in.push_back({0, 10, 10, 0});
+
+  for (int i = 0; i < 100000; i++) {
+    out.clear();
+    separate_frects_64(in, &out);
+  }
+
+  expected_out.push_back(RectSet(IdSet(0), Rect(0, 0, 2, 5)));
+  expected_out.push_back(RectSet(IdSet(1), Rect(2, 5, 6, 6)));
+  expected_out.push_back(RectSet(IdSet(1) | 0, Rect(2, 0, 4, 5)));
+  expected_out.push_back(RectSet(IdSet(1) | 2, Rect(4, 0, 6, 5)));
+  expected_out.push_back(RectSet(IdSet(2), Rect(6, 0, 8, 5)));
+  expected_out.push_back(RectSet(IdSet(3), Rect(0, 7, 8, 9)));
+  expected_out.push_back(RectSet(IdSet(4), Rect(10, 0, 12, 5)));
+  expected_out.push_back(RectSet(IdSet(5) | 4, Rect(12, 0, 16, 5)));
+  expected_out.push_back(RectSet(IdSet(4), Rect(16, 0, 18, 5)));
+  expected_out.push_back(RectSet(IdSet(6), Rect(20, 11, 22, 17)));
+  expected_out.push_back(RectSet(IdSet(6) | 7, Rect(22, 13, 24, 17)));
+  expected_out.push_back(RectSet(IdSet(6), Rect(22, 11, 24, 13)));
+  expected_out.push_back(RectSet(IdSet(7), Rect(22, 17, 24, 21)));
+  expected_out.push_back(RectSet(IdSet(7), Rect(24, 13, 26, 21)));
+  expected_out.push_back(RectSet(IdSet(9), Rect(30, 31, 32, 39)));
+  expected_out.push_back(RectSet(IdSet(8) | 9, Rect(32, 33, 36, 37)));
+  expected_out.push_back(RectSet(IdSet(9), Rect(32, 37, 36, 39)));
+  expected_out.push_back(RectSet(IdSet(9), Rect(32, 31, 36, 33)));
+  expected_out.push_back(RectSet(IdSet(9), Rect(36, 31, 38, 39)));
+  expected_out.push_back(RectSet(IdSet(10), Rect(40, 43, 44, 45)));
+  expected_out.push_back(RectSet(IdSet(10) | 11, Rect(44, 43, 46, 45)));
+  expected_out.push_back(RectSet(IdSet(11), Rect(44, 41, 46, 43)));
+  expected_out.push_back(RectSet(IdSet(11), Rect(44, 45, 46, 47)));
+  expected_out.push_back(RectSet(IdSet(10), Rect(46, 43, 48, 45)));
+  expected_out.push_back(RectSet(IdSet(12) | 13 | 14, Rect(50, 51, 52, 53)));
+
+  ASSERT_TRUE(IsEquality(out, expected_out));
+}