fix: Corrected the AsciiDoc syntax to properly display spring code.

[runbing]

There is a code snippet, resembling AsciiDoc syntax, that is confusing me as I follow the guide "Testing the Web Layer". The actual spring code snippet does not seem to be properly rendered.

Here is a comparison between the version before and after the fix.

Before:

@WebMvcTest
include::complete/src/test/java/com/example/testingweb/WebLayerTest.java

After:

package com.example.testingweb;

import static org.hamcrest.Matchers.containsString;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import org.junit.jupiter.api.Test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.test.web.servlet.MockMvc;

@WebMvcTest(HomeController.class)
class WebLayerTest {

	@Autowired
	private MockMvc mockMvc;

	@Test
	void shouldReturnDefaultMessage() throws Exception {
		this.mockMvc.perform(get("/")).andDo(print()).andExpect(status().isOk())
				.andExpect(content().string(containsString("Hello, World")));
	}
}