155     AtomAggregator aggregator;  in TEST()  local
156     EXPECT_TRUE(aggregator.empty());  in TEST()
160     AtomAggregator aggregator;  in TEST()  local
161     aggregator.push({kExampleKey, {}});  in TEST()
162     EXPECT_FALSE(aggregator.empty());  in TEST()
166     AtomAggregator aggregator;  in TEST()  local
167     aggregator.push({kExampleKey, {}});  in TEST()
168     const auto [k, v] = aggregator.pop();  in TEST()
169     EXPECT_TRUE(aggregator.empty());  in TEST()
180     AtomAggregator aggregator;  in TEST()  local
181     aggregator.push({key1, value1});  in TEST()
182     aggregator.push({key2, value2});  in TEST()
184     const auto [resultKey, resultValue] = aggregator.pop();  in TEST()
188     EXPECT_FALSE(aggregator.empty());  in TEST()
196     AtomAggregator aggregator;  in TEST()  local
197     aggregator.push({key1, value1});  in TEST()
198     aggregator.push({key1, value2});  in TEST()
200     const auto [resultKey, resultValue] = aggregator.pop();  in TEST()
204     EXPECT_TRUE(aggregator.empty());  in TEST()
215     AtomAggregator aggregator;  in TEST()  local
216     aggregator.push({key1, value1});  in TEST()
217     aggregator.push({key2, value2});  in TEST()
218     aggregator.push({key1, value3});  in TEST()
220     const auto [resultKey1, resultValue1] = aggregator.pop();  in TEST()
221     const auto [resultKey2, resultValue2] = aggregator.pop();  in TEST()
227     EXPECT_TRUE(aggregator.empty());  in TEST()