diff --git a/src/query.c b/src/query.c
index c705912..642474b 100644
--- a/src/query.c
+++ b/src/query.c
@@ -3,6 +3,5 @@
 //
 #include "query.h"
 
-up_bus_t* up_queries = NULL;
-down_bus_t *down_queries = NULL;
+
 
diff --git a/src/rail.c b/src/rail.c
index 721e09f..bd21bb6 100644
--- a/src/rail.c
+++ b/src/rail.c
@@ -5,4 +5,38 @@ rail_node_t *rails = NULL;
 int add(int a, int b)
 {
     return a+ b;
+}
+
+rail_node_t *CreateRails(int length, int node_num)
+{
+    /**
+     * 表示轨道的头节点
+     */
+    rail_node_t *head = NULL;
+    rail_node_t *node = NULL;
+
+    head = (rail_node_t*) malloc(sizeof (rail_node_t));
+    head->id = 1;
+    head->last_node_distance = length;
+    head->next_node_distance = length;
+
+    node = head;
+    // 循环创建每一个节点
+    for(int i = 2; i <= node_num; i++)
+    {
+        rail_node_t *p = (rail_node_t*) malloc(sizeof (rail_node_t));
+
+        p->id = i;
+        p->last_node_distance = length;
+        p->next_node_distance = length;
+        p->last_node = node;
+        node->next_node = p;
+        node = p;
+    }
+
+    // 循环结束时node就是最后一个节点
+    node->next_node = head;
+    head->last_node = node;
+
+    return head;
 }
\ No newline at end of file
diff --git a/test/io_test.cpp b/test/io_test.cpp
index 6e44831..fe79dd4 100644
--- a/test/io_test.cpp
+++ b/test/io_test.cpp
@@ -9,48 +9,14 @@ extern "C"
 {
 #endif
 #include "rail.h"
-#include "bus_io.h"
-#include "query.h"
-#include "define.h"
 #ifdef __cplusplus
 }
 #endif
 
-using ::testing::Return;
-using ::testing::AtLeast;
-using ::testing::Exactly;
-
 using namespace testing;
 
 TEST(test, test)
 {
     int result = add(1, 1);
     EXPECT_EQ(2, result);
-}
-
-/**
- * 测试输入读取函数读取clock时的行为
- */
-TEST(io_test, io_clock)
-{
-    char input[7] = "clock\n";
-    int result = ReadInput(input);
-    EXPECT_EQ(result, IO_CLOCK);
-}
-
-/**
- * 测试顺时针3号站台上车请求
- */
-TEST(io_test, reading)
-{
-    char input[] = "counterclockwise 3\n";
-    int result = ReadInput(input);
-    EXPECT_EQ(result, IO_READING);
-}
-
-TEST(io_test, end)
-{
-    char input[] = "end\n";
-    int result = ReadInput(input);
-    EXPECT_EQ(result, IO_END);
 }
\ No newline at end of file
diff --git a/test/rail_test.cpp b/test/rail_test.cpp
new file mode 100644
index 0000000..d30b3f1
--- /dev/null
+++ b/test/rail_test.cpp
@@ -0,0 +1,44 @@
+//
+// Created by ricardo on 2022/5/17.
+//
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+#include "rail.h"
+#ifdef __cplusplus
+}
+#endif
+
+using namespace testing;
+
+TEST(rail, CreateRails)
+{
+    rail_node_t *head = CreateRails(10, 10);
+    rail_node_t *p = head;
+
+    for(int i = 1; i <= 10; i++)
+    {
+        EXPECT_EQ(p->id, i);
+        EXPECT_EQ(p->next_node_distance, 10);
+        EXPECT_EQ(p->last_node_distance, 10);
+        p = p->next_node;
+    }
+
+    p = head->last_node;
+    for(int i = 10; i >= 1; i--)
+    {
+        EXPECT_EQ(p->id, i);
+        EXPECT_EQ(p->next_node_distance, 10);
+        EXPECT_EQ(p->last_node_distance, 10);
+        p = p->last_node;
+    }
+}
+
+
+
+
+