BAEL-3827 Add CSS and JS to Thymeleaf (#8985)

* BAEL-3827 Add CSS and JS to Thymeleaf

* BAEL-3827 Add integration tests

* BAEL-3827 Add new spring-thymeleaf-3 module to the parent pom.xml

* BAEL-3827 Add new spring-thymeleaf-3 module to the parent pom.xml in both places

spring-thymeleaf-3/src/test/java/com/baeldung/thymeleaf/ApplicationIntegrationTest.java

@@ -0,0 +1,13 @@
+package com.baeldung.thymeleaf;
+
+import org.junit.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+public class ApplicationIntegrationTest {
+
+    @Test
+    public void contextLoads() {
+        
+    }
+}

spring-thymeleaf-3/src/test/java/com/baeldung/thymeleaf/cssandjs/CssAndJsControllerIntegrationTest.java

@@ -0,0 +1,41 @@
+package com.baeldung.thymeleaf.cssandjs;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.context.WebApplicationContext;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@WebAppConfiguration
+@ContextConfiguration(classes = CssAndJsApplication.class)
+public class CssAndJsControllerIntegrationTest {
+    @Autowired
+    private WebApplicationContext context;
+
+    private MockMvc mockMvc;
+
+    @Before
+    public void setup() {
+        this.mockMvc = MockMvcBuilders.webAppContextSetup(this.context).build();
+    }
+    
+    @Test
+    public void whenCalledGetStyledPage_thenReturnContent() throws Exception {
+        this.mockMvc.perform(MockMvcRequestBuilders.get("/styled-page"))
+            .andExpect(status().isOk())
+            .andExpect(view().name("cssandjs/styledPage"))
+            .andExpect(content().string(containsString("Carefully Styled Heading")));
+    }
+}