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WebApplicationTests.java

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+package com.example.web;
+
+import static org.hamcrest.Matchers.equalTo;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.RequestBuilder;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+@ExtendWith(SpringExtension.class)
+@SpringBootTest
+class WebApplicationTests {
+
+    private MockMvc mvc;
+
+    @BeforeEach //替代 @Before
+    public void setUp() {
+        mvc = MockMvcBuilders.standaloneSetup(new UserController()).build();
+    }
+
+    @Test
+    public void testUserController() throws Exception {
+        // 测试UserController
+        RequestBuilder request;
+
+        // 1、get查一下user列表，应该为空
+        request = get("/users/");
+        mvc.perform(request)
+                .andExpect(status().isOk())
+                .andExpect(content().string(equalTo("[]")));
+
+        // 2、post提交一个user
+        request = post("/users/")
+                .contentType(MediaType.APPLICATION_JSON)
+                .content("{\"id\":1,\"name\":\"测试大师\",\"age\":20}");
+        mvc.perform(request)
+                .andExpect(content().string(equalTo("success")));
+
+        // 3、get获取user列表，应该有刚才插入的数据
+        request = get("/users/");
+        mvc.perform(request)
+                .andExpect(status().isOk())
+                .andExpect(content().string(equalTo("[{\"id\":1,\"name\":\"测试大师\",\"age\":20}]")));
+
+        // 4、put修改id为1的user
+        request = put("/users/1")
+                .contentType(MediaType.APPLICATION_JSON)
+                .content("{\"name\":\"测试终极大师\",\"age\":30}");
+        mvc.perform(request)
+                .andExpect(content().string(equalTo("success")));
+
+        // 5、get一个id为1的user
+        request = get("/users/1");
+        mvc.perform(request)
+                .andExpect(content().string(equalTo("{\"id\":1,\"name\":\"测试终极大师\",\"age\":30}")));
+
+        // 6、del删除id为1的user
+        request = delete("/users/1");
+        mvc.perform(request)
+                .andExpect(content().string(equalTo("success")));
+
+        // 7、get查一下user列表，应该为空
+        request = get("/users/");
+        mvc.perform(request)
+                .andExpect(status().isOk())
+                .andExpect(content().string(equalTo("[]")));
+
+    }
+
+}