Fix SampleOAuth2SsoApplicationTests

The redirect happens in two stages, first from / to /login on localhost
and then to github.com. This commit updates the test to check that the
first redirect has worked, i.e. from / to /login on localhost.

spring-boot-samples/spring-boot-sample-secure-sso/src/test/java/sample/secure/sso/SampleOAuth2SsoApplicationTests.java

 package sample.secure.sso;
 
-import static org.hamcrest.CoreMatchers.containsString;
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
-import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
-import static org.springframework.test.web.servlet.setup.MockMvcBuilders.webAppContextSetup;
-
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -19,6 +13,12 @@ import org.springframework.test.context.web.WebAppConfiguration;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.web.context.WebApplicationContext;
 
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.setup.MockMvcBuilders.webAppContextSetup;
+
 /**
  * Series of automated integration tests to verify proper behavior of auto-configured,
  * OAuth2-secured system
@@ -47,8 +47,9 @@ public class SampleOAuth2SsoApplicationTests {
 
 	@Test
 	public void everythingIsSecuredByDefault() throws Exception {
-		this.mvc.perform(get("/")).andExpect(status().isFound())
-				.andExpect(header().string("location", containsString("github.com")));
+		this.mvc.perform(get("/"))
+				.andExpect(status().isFound())
+				.andExpect(header().string("location", containsString("localhost/login")));
 	}
 
 }