Allow moving cursors between connected displays.

ash/display/display_util_unittest.cc

Index: ash/display/display_util_unittest.cc
diff --git a/ash/display/display_util_unittest.cc b/ash/display/display_util_unittest.cc
index 14e3b03a9dd5c2c2d3aefa7e349a481803dff75d..10866ba19c088c45c474f3e91118aacb9c2a27d9 100644
--- a/ash/display/display_util_unittest.cc
+++ b/ash/display/display_util_unittest.cc
@@ -98,12 +98,26 @@ TEST_F(DisplayUtilTest, GenerateDisplayIdList) {
     list = GenerateDisplayIdList(std::begin(ids), std::end(ids));
     EXPECT_EQ(1, list[0]);
     EXPECT_EQ(10, list[1]);
+
+    int64_t three_ids[] = {10, 5, 1};
+    list = GenerateDisplayIdList(std::begin(three_ids), std::end(three_ids));
+    ASSERT_EQ(3u, list.size());
+    EXPECT_EQ(1, list[0]);
+    EXPECT_EQ(5, list[1]);
+    EXPECT_EQ(10, list[2]);
   }
   {
     int64_t ids[] = {10, 100};
     list = GenerateDisplayIdList(std::begin(ids), std::end(ids));
     EXPECT_EQ(10, list[0]);
     EXPECT_EQ(100, list[1]);
+
+    int64_t three_ids[] = {10, 100, 1000};
+    list = GenerateDisplayIdList(std::begin(three_ids), std::end(three_ids));
+    ASSERT_EQ(3u, list.size());
+    EXPECT_EQ(10, list[0]);
+    EXPECT_EQ(100, list[1]);
+    EXPECT_EQ(1000, list[2]);
   }
   {
     test::ScopedSetInternalDisplayId set_internal(100);
@@ -116,6 +130,13 @@ TEST_F(DisplayUtilTest, GenerateDisplayIdList) {
     list = GenerateDisplayIdList(std::begin(ids), std::end(ids));
     EXPECT_EQ(100, list[0]);
     EXPECT_EQ(10, list[1]);
+
+    int64_t three_ids[] = {10, 100, 1000};
+    list = GenerateDisplayIdList(std::begin(three_ids), std::end(three_ids));
+    ASSERT_EQ(3u, list.size());
+    EXPECT_EQ(100, list[0]);
+    EXPECT_EQ(10, list[1]);
+    EXPECT_EQ(1000, list[2]);
   }
   {
     test::ScopedSetInternalDisplayId set_internal(10);
@@ -128,6 +149,27 @@ TEST_F(DisplayUtilTest, GenerateDisplayIdList) {
     list = GenerateDisplayIdList(std::begin(ids), std::end(ids));
     EXPECT_EQ(10, list[0]);
     EXPECT_EQ(100, list[1]);
+
+    int64_t three_ids[] = {10, 100, 1000};
+    list = GenerateDisplayIdList(std::begin(three_ids), std::end(three_ids));
+    ASSERT_EQ(3u, list.size());
+    EXPECT_EQ(10, list[0]);
+    EXPECT_EQ(100, list[1]);
+    EXPECT_EQ(1000, list[2]);
+  }
+}
+
+TEST_F(DisplayUtilTest, DisplayIdListToString) {
+  {
+    int64_t ids[] = {10, 1, 16};
+    DisplayIdList list = GenerateDisplayIdList(std::begin(ids), std::end(ids));
+    EXPECT_EQ("1,10,16", DisplayIdListToString(list));
+  }
+  {
+    test::ScopedSetInternalDisplayId set_internal(16);
+    int64_t ids[] = {10, 1, 16};
+    DisplayIdList list = GenerateDisplayIdList(std::begin(ids), std::end(ids));
+    EXPECT_EQ("16,1,10", DisplayIdListToString(list));
   }
 }