chore: import upstream snapshot with attribution

test/cpp/fluid/framework/scope_test.cc

@@ -0,0 +1,79 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
+
+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 "paddle/fluid/framework/scope.h"
+
+#include "gtest/gtest.h"
+
+namespace paddle {
+namespace framework {
+class Variable;
+}  // namespace framework
+}  // namespace paddle
+
+using paddle::framework::Scope;
+using paddle::framework::Variable;
+
+TEST(Scope, VarsShadowing) {
+  Scope s;
+  Scope& ss1 = s.NewScope();
+  Scope& ss2 = s.NewScope();
+
+  Variable* v0 = s.Var("a");
+  Variable* v1 = ss1.Var("a");
+
+  EXPECT_NE(v0, v1);
+
+  EXPECT_EQ(v0, s.FindVar("a"));
+  EXPECT_EQ(v1, ss1.FindVar("a"));
+  EXPECT_EQ(v0, ss2.FindVar("a"));
+}
+
+TEST(Scope, FindVar) {
+  Scope s;
+  Scope& ss = s.NewScope();
+
+  EXPECT_EQ(nullptr, s.FindVar("a"));
+  EXPECT_EQ(nullptr, ss.FindVar("a"));
+
+  ss.Var("a");
+
+  EXPECT_EQ(nullptr, s.FindVar("a"));
+  EXPECT_NE(nullptr, ss.FindVar("a"));
+}
+
+TEST(Scope, FindScope) {
+  Scope s;
+  Scope& ss = s.NewScope();
+  Variable* v = s.Var("a");
+
+  EXPECT_EQ(&s, s.FindScope(v));
+  EXPECT_EQ(&s, s.FindScope("a"));
+  EXPECT_EQ(&s, ss.FindScope(v));
+  EXPECT_EQ(&s, ss.FindScope("a"));
+}
+
+TEST(Scope, GetAllNames) {
+  Scope s;
+  Variable* v = s.Var("a");
+  EXPECT_EQ(&s, s.FindScope(v));
+
+  std::vector<std::string> ans = s.LocalVarNames();
+  std::string str;
+  for (auto& var : ans) {
+    str += var;
+  }
+
+  EXPECT_STREQ("a", str.c_str());
+}