FindNode函数测试通过

重命名形参，避免和全局变量冲突

include/rail.h

@@ -37,11 +37,11 @@ extern rail_node_t *rails;
 
 /**
  * 查找指定编号的站点指针
- * @param rails 轨道的头节点地址
+ * @param head 轨道的头节点地址
  * @param id 需要查找的站点编号
  * @return 需要查找站点指针
  */
-rail_node_t *FindNode(rail_node_t *rails, int id);
+rail_node_t *FindNode(rail_node_t *head, int id);
 
 /**
  * 创建轨道列表

src/rail.c

@@ -41,18 +41,18 @@ rail_node_t *CreateRails(int length, int node_num)
     return head;
 }
 
-rail_node_t *FindNode(rail_node_t *rails, int id)
+rail_node_t *FindNode(rail_node_t *head, int id)
 {
     rail_node_t *p = NULL;
-    if(rails)
+    if(head)
     {
-        if(rails->id == id)
+        if(head->id == id)
         {
-            return rails;
+            return head;
         }
-        if(rails->next_node != NULL)
+        if(head->next_node != NULL)
         {
-            p = FindNode(rails->next_node, id);
+            p = FindNode(head->next_node, id);
             if(p) 
             {
                 return p;

test/rail_test.cpp

@@ -38,6 +38,18 @@ TEST(rail, CreateRails)
     }
 }
 
+TEST(rail, FindNode)
+{
+    rail_node_t *head = CreateRails(10, 10);
+    rail_node_t *p = nullptr;
+
+    p = FindNode(head, 3);
+    EXPECT_EQ(p->id, 3);
+
+    p = FindNode(head, 9);
+    EXPECT_EQ(p->id, 9);
+}
+