Add test for customize container factory

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/ServerPropertiesTests.java

@@ -24,9 +24,12 @@ import java.util.Map;
 import org.junit.Test;
 import org.springframework.beans.MutablePropertyValues;
 import org.springframework.boot.bind.RelaxedDataBinder;
+import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainerFactory;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
 
 /**
  * Tests for {@link ServerProperties}.
@@ -68,6 +71,19 @@ public class ServerPropertiesTests {
 				.getProtocolHeader());
 	}
 
-	// FIXME test customize
+	@Test
+	public void testCustomizeTomcat() throws Exception {
+		ConfigurableEmbeddedServletContainerFactory factory = mock(ConfigurableEmbeddedServletContainerFactory.class);
+		this.properties.customize(factory);
+		verify(factory).setContextPath("");
+	}
+
+	@Test
+	public void testCustomizeTomcatPort() throws Exception {
+		ConfigurableEmbeddedServletContainerFactory factory = mock(ConfigurableEmbeddedServletContainerFactory.class);
+		this.properties.setPort(8080);
+		this.properties.customize(factory);
+		verify(factory).setPort(8080);
+	}
 
 }