Polish tests

Closes gh-3946

spring-boot/src/test/java/org/springframework/boot/bind/PropertiesConfigurationFactoryTests.java

@@ -97,7 +97,6 @@ public class PropertiesConfigurationFactoryTests {
 		this.factory.setPropertySources(propertySources);
 		this.factory.setIgnoreUnknownFields(false);
 		this.factory.afterPropertiesSet();
-		this.factory.getObject();
 		Foo foo = this.factory.getObject();
 		assertEquals("bar", foo.name);
 	}

spring-boot/src/test/java/org/springframework/boot/context/properties/ConfigurationPropertiesBindingPostProcessorTests.java

@@ -88,7 +88,7 @@ public class ConfigurationPropertiesBindingPostProcessorTests {
 	}
 
 	@Test
-	public void unknonwFieldFailureMessageContainsDetailsOfPropertyOrigin() {
+	public void unknownFieldFailureMessageContainsDetailsOfPropertyOrigin() {
 		this.context = new AnnotationConfigApplicationContext();
 		EnvironmentTestUtils.addEnvironment(this.context, "com.example.baz:spam");
 		this.context.register(TestConfiguration.class);