Tidied up tests

jackson/src/test/java/com/baeldung/jackson/miscellaneous/mixin/OptionalTypeTest.java

@@ -11,64 +11,51 @@ import org.junit.Test;
 
 public class OptionalTypeTest {
 
-    ObjectMapper mapper = new ObjectMapper()
-            .registerModule(new Jdk8Module());
+    ObjectMapper mapper = new ObjectMapper().registerModule(new Jdk8Module());
 
     @Test
-    public void givenOptional_whenSerializing_thenValueInJson() throws JsonProcessingException {
+    public void givenPresentOptional_whenSerializing_thenValueInJson() throws JsonProcessingException {
 
-        // arrange
         String subTitle = "The Parish Boy's Progress";
         Book book = new Book();
         book.setTitle("Oliver Twist");
         book.setSubTitle(Optional.of(subTitle));
 
-        // act
         String result = mapper.writeValueAsString(book);
 
-        // assert
         assertThat(from(result).getString("subTitle")).isEqualTo(subTitle);
     }
 
     @Test
     public void givenEmptyOptional_whenSerializing_thenNullValue() throws JsonProcessingException {
 
-        // arrange
         Book book = new Book();
         book.setTitle("Oliver Twist");
         book.setSubTitle(Optional.empty());
 
-        // act
         String result = mapper.writeValueAsString(book);
 
-        // assert
         assertThat(from(result).getString("subTitle")).isNull();
     }
 
     @Test
-    public void givenField_whenDeserializing_thenOptionalWithValue() throws IOException {
+    public void givenField_whenDeserializingIntoOptional_thenIsPresentWithValue() throws IOException {
 
-        // arrange
         String subTitle = "The Parish Boy's Progress";
         String book = "{ \"title\": \"Oliver Twist\", \"subTitle\": \"" + subTitle + "\" }";
 
-        // act
         Book result = mapper.readValue(book, Book.class);
 
-        // assert
         assertThat(result.getSubTitle()).isEqualTo(Optional.of(subTitle));
     }
 
     @Test
-    public void givenEmptyField_whenDeserializing_thenEmptyOptional() throws IOException {
+    public void givenNullField_whenDeserializingIntoOptional_thenIsEmpty() throws IOException {
 
-        // arrange
         String book = "{ \"title\": \"Oliver Twist\", \"subTitle\": null }";
 
-        // act
         Book result = mapper.readValue(book, Book.class);
 
-        // assert
         assertThat(result.getSubTitle()).isEmpty();
     }
 }