remove unnecessary clear operation

Signed-off-by: Chen Lihui <lihui.chen@sony.com>

Author: Chen Lihui

rclcpp/test/rclcpp/test_memory_strategy.cpp

@@ -115,7 +115,6 @@ TEST_F(TestMemoryStrategy, get_subscription_by_handle) {
         nullptr,
         memory_strategy()->get_subscription_by_handle(subscription_handle, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_subscription_by_handle(subscription_handle, weak_groups_to_nodes));
@@ -168,7 +167,6 @@ TEST_F(TestMemoryStrategy, get_service_by_handle) {
         nullptr,
         memory_strategy()->get_service_by_handle(service_handle, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_service_by_handle(service_handle, weak_groups_to_nodes));
@@ -216,7 +214,6 @@ TEST_F(TestMemoryStrategy, get_client_by_handle) {
         nullptr,
         memory_strategy()->get_client_by_handle(client_handle, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_client_by_handle(client_handle, weak_groups_to_nodes));
@@ -265,7 +262,6 @@ TEST_F(TestMemoryStrategy, get_timer_by_handle) {
         nullptr,
         memory_strategy()->get_timer_by_handle(timer_handle, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_timer_by_handle(timer_handle, weak_groups_to_nodes));
@@ -360,7 +356,6 @@ TEST_F(TestMemoryStrategy, get_group_by_subscription) {
         callback_group,
         memory_strategy()->get_group_by_subscription(subscription, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_group_by_subscription(subscription, weak_groups_to_nodes));
@@ -405,7 +400,6 @@ TEST_F(TestMemoryStrategy, get_group_by_service) {
         callback_group,
         memory_strategy()->get_group_by_service(service, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_group_by_service(service, weak_groups_to_nodes));
@@ -445,7 +439,6 @@ TEST_F(TestMemoryStrategy, get_group_by_client) {
         callback_group,
         memory_strategy()->get_group_by_client(client, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_group_by_client(client, weak_groups_to_nodes));
@@ -485,7 +478,6 @@ TEST_F(TestMemoryStrategy, get_group_by_timer) {
         callback_group,
         memory_strategy()->get_group_by_timer(timer, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_group_by_timer(timer, weak_groups_to_nodes));
@@ -524,7 +516,6 @@ TEST_F(TestMemoryStrategy, get_group_by_waitable) {
         callback_group,
         memory_strategy()->get_group_by_waitable(waitable, weak_groups_to_nodes));
     }  // callback_group goes out of scope
-    memory_strategy()->clear_handles();
     EXPECT_EQ(
       nullptr,
       memory_strategy()->get_group_by_waitable(waitable, weak_groups_to_nodes));