Merge branch 'master' into sync-condition-2023Oct11

tests/cpp/tree/gpu_hist/test_expand_entry.cu

@@ -0,0 +1,28 @@
+/**
+ * Copyright 2023, XGBoost Contributors
+ */
+#include <gtest/gtest.h>
+#include <xgboost/json.h>
+#include <xgboost/tree_model.h>  // for RegTree
+
+#include "../../../../src/tree/gpu_hist/expand_entry.cuh"
+
+namespace xgboost::tree {
+TEST(ExpandEntry, IOGPU) {
+  DeviceSplitCandidate split;
+  GPUExpandEntry entry{RegTree::kRoot, 0, split, 3.0, 1.0, 2.0};
+
+  Json je{Object{}};
+  entry.Save(&je);
+
+  GPUExpandEntry loaded;
+  loaded.Load(je);
+
+  ASSERT_EQ(entry.base_weight, loaded.base_weight);
+  ASSERT_EQ(entry.left_weight, loaded.left_weight);
+  ASSERT_EQ(entry.right_weight, loaded.right_weight);
+
+  ASSERT_EQ(entry.GetDepth(), loaded.GetDepth());
+  ASSERT_EQ(entry.GetLossChange(), loaded.GetLossChange());
+}
+}  // namespace xgboost::tree