From 948189888bc3eacf9ed26f6c14f270d8e7a67a63 Mon Sep 17 00:00:00 2001
From: Chris Loer <chris.loer@gmail.com>
Date: Mon, 23 Oct 2017 16:22:27 -0700
Subject: Add basic unit test for GridIndex.

---
 cmake/test-files.cmake        |  1 +
 test/util/grid_index.test.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 test/util/grid_index.test.cpp

diff --git a/cmake/test-files.cmake b/cmake/test-files.cmake
index 027c34f31e..af7397be27 100644
--- a/cmake/test-files.cmake
+++ b/cmake/test-files.cmake
@@ -124,6 +124,7 @@ set(MBGL_TEST_FILES
     test/util/async_task.test.cpp
     test/util/dtoa.test.cpp
     test/util/geo.test.cpp
+    test/util/grid_index.test.cpp
     test/util/http_timeout.test.cpp
     test/util/image.test.cpp
     test/util/mapbox.test.cpp
diff --git a/test/util/grid_index.test.cpp b/test/util/grid_index.test.cpp
new file mode 100644
index 0000000000..b0a4e581a3
--- /dev/null
+++ b/test/util/grid_index.test.cpp
@@ -0,0 +1,53 @@
+#include <mbgl/util/grid_index.hpp>
+#include <mbgl/util/grid_index.cpp>
+
+#include <mbgl/test/util.hpp>
+
+using namespace mbgl;
+
+TEST(GridIndex, IndexesFeatures) {
+    GridIndex<int16_t> grid(100, 100, 10);
+    grid.insert(0, {{4, 10}, {6, 30}});
+    grid.insert(1, {{4, 10}, {30, 12}});
+    grid.insert(2, {{-10, 30}, {5, 35}});
+    
+    EXPECT_EQ(grid.query({{4, 10}, {5, 11}}), (std::vector<int16_t>{0, 1}));
+    EXPECT_EQ(grid.query({{24, 10}, {25, 11}}), (std::vector<int16_t>{1}));
+    EXPECT_EQ(grid.query({{40, 40}, {100, 100}}), (std::vector<int16_t>{}));
+    EXPECT_EQ(grid.query({{-6, 0}, {3, 100}}), (std::vector<int16_t>{2}));
+    EXPECT_EQ(grid.query({{-1000, -1000}, {1000, 1000}}), (std::vector<int16_t>{0, 1, 2}));
+}
+
+TEST(GridIndex, DuplicateKeys) {
+    GridIndex<int16_t> grid(100, 100, 10);
+    #define KEY 123
+    grid.insert(KEY, {{3, 4}, {4, 4}});
+    grid.insert(KEY, {{13, 13}, {14, 14}});
+    grid.insert(KEY, {{23, 23}, {24, 24}});
+    
+    EXPECT_EQ(grid.query({{0, 0}, {30, 30}}), (std::vector<int16_t>{KEY, KEY, KEY}));
+}
+
+TEST(GridIndex, CircleCircle) {
+    GridIndex<int16_t> grid(100, 100, 10);
+    grid.insert(0, {{50, 50}, 10});
+    grid.insert(1, {{60, 60}, 15});
+    grid.insert(2, {{-10, 110}, 20});
+    
+    EXPECT_TRUE(grid.hitTest({{55, 55}, 2}));
+    EXPECT_FALSE(grid.hitTest({{10, 10}, 10}));
+    EXPECT_TRUE(grid.hitTest({{0, 100}, 10}));
+    EXPECT_TRUE(grid.hitTest({{80, 60}, 10}));
+}
+
+TEST(GridIndex, CircleBox) {
+    GridIndex<int16_t> grid(100, 100, 10);
+    grid.insert(0, {{50, 50}, 10});
+    grid.insert(1, {{60, 60}, 15});
+    grid.insert(2, {{-10, 110}, 20});
+    
+    EXPECT_EQ(grid.query({{45, 45}, {55, 55}}), (std::vector<int16_t>{0, 1}));
+    EXPECT_EQ(grid.query({{0, 0}, {30, 30}}), (std::vector<int16_t>{}));
+    EXPECT_EQ(grid.query({{0, 80}, {20, 100}}), (std::vector<int16_t>{2}));
+}
+
-- 
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