fix checkstyle errors in calculator tests and News class

src/main/java/edu/ntnu/idi/idatt2003/gruppe42/model/News.java

@@ -4,15 +4,34 @@
 import java.util.List;
 import java.util.Random;
 
+/**
+ * Represents generated news related to a company and its market trend.
+ *
+ * <p>This class creates random news headlines and authors based on whether the
+ * company has a positive or negative trend.
+ */
 public class News {
   private final String company;
   private final int trend;
   private final Random random = new Random();
-  public News(String company, int trend){
+
+  /**
+   * Constructs a News object for a given company and trend.
+   *
+   * @param company the company the news is related to
+   * @param trend a numeric indicator of market trend (positive = good news, negative = bad news)
+   */
+  public News(String company, int trend) {
     this.company = company;
     this.trend = trend;
   }
-  public String generateAuthor(){
+
+  /**
+   * Generates a random author email for the news article.
+   *
+   * @return a randomly selected fictional author email
+   */
+  public String generateAuthor() {
     List<String> authors = new ArrayList<>();
     authors.add("market@stocks.com");
     authors.add("myfatherworksatmicrosoft@hotmail.com");
@@ -36,34 +55,67 @@ public String generateAuthor(){
     authors.add("nsa.definitely.not.reading.this@nsa.gov");
     return authors.get(random.nextInt(authors.size()));
   }
-  public String generateNews(){
+
+  /**
+   * Generates a random news headline based on the company's trend.
+   * 
+   * <p>If the trend is positive, good news headlines are generated.
+   * If the trend is negative or zero, bad news headlines are generated.
+   *
+   * @return a randomly generated news headline
+   */
+  public String generateNews() {
     if (trend > 0) {
-      List<String> goodNews = new ArrayList<>();
-      goodNews.add("Turns out the product of " + company + " is good for the environment.");
-      goodNews.add("Beaver population increased due to the efforts of " + company + ".");
-      goodNews.add("Eminem dropped new hit single, namedropping " + company + ".");
-      goodNews.add("Founder of " + company + " seen feeding the homeless.");
-      goodNews.add(company + " got frontpage in new forbes magazine, on top companies to invest in.");
-      goodNews.add("IShowSpeed seen using " + company + " products in the background of viral livestream.");
-      goodNews.add("New studies show that " + company + " took part in inventing the rainbow back in 4,542,997,974 BC");
-      goodNews.add(company + " has made breakthroughs in the field of artificial intelligence.");
-      goodNews.add("After the release of the brand new logo of " + company + ", the logo has been called the \"a glimpse of the future\".");
-      goodNews.add("EX-EMPLOYEES of " + company + " REVEAL that the work environment and safety regulations are not up to basic standards but far surpassing them.");
-      goodNews.add("Founder of " + company + " seen rudely pushing a homeless man out of the road, saving his life.");
+      List<String> goodNews = getStringsGood();
+
       return goodNews.get(random.nextInt(goodNews.size()));
     }
+    List<String> badNews = getStringsBad();
+    return badNews.get(random.nextInt(badNews.size()));
+  }
+
+  private List<String> getStringsGood() {
+    List<String> goodNews = new ArrayList<>();
+    goodNews.add("Turns out the product of " + company + " is good for the environment.");
+    goodNews.add("Beaver population increased due to the efforts of " + company + ".");
+    goodNews.add("Eminem dropped new hit single, namedropping " + company + ".");
+    goodNews.add("Founder of " + company + " seen feeding the homeless.");
+    goodNews.add(company + " got frontpage in new forbes magazine, "
+            + "on top companies to invest in.");
+    goodNews.add("IShowSpeed seen using " + company
+            + " products in the background of viral livestream.");
+    goodNews.add("New studies show that " + company
+            + " took part in inventing the rainbow back in 4,542,997,974 BC");
+    goodNews.add(company + " has made breakthroughs in the field of artificial intelligence.");
+    goodNews.add("After the release of the brand new logo of " + company
+            + ", the logo has been called the \"a glimpse of the future\".");
+    goodNews.add("EX-EMPLOYEES of " + company + " REVEAL that the work environment "
+            + "and safety regulations are not up to basic standards but far surpassing them.");
+    goodNews.add("Founder of " + company
+            + " seen rudely pushing a homeless man out of the road, saving his life.");
+    return goodNews;
+  }
+
+  private List<String> getStringsBad() {
     List<String> badNews = new ArrayList<>();
     badNews.add("Turns out the product of " + company + " is bad for the environment.");
     badNews.add("Founder of " + company + " seen rudely pushing a homeless man out of the way.");
     badNews.add(company + " mentioned in epstein files.");
-    badNews.add(company + " has created many dams for beavers, causing them to lay around in the sun all day and die of laziness.");
-    badNews.add(company + " initiated a campaign to feed the homeless with burgers, using dog meat. This has decreased the number of starvation deaths among the homeless.");
-    badNews.add("Turns out " + company + " created the first covid-19 vaccines, which are not safe for humans.");
+    badNews.add(company + " has created many dams for beavers, causing them to lay"
+            + " around in the sun all day and die of laziness.");
+    badNews.add(company + " initiated a campaign to feed the homeless with burgers, using dog meat."
+            + "This has decreased the number of starvation deaths among the homeless.");
+    badNews.add("Turns out " + company + " created the first covid-19 vaccines, "
+            + "which are not safe for humans.");
     badNews.add("Extensive research of " + company + " shows financial holes in the company.");
     badNews.add("Founder of " + company + " heiling at press conference discussing great ideas.");
-    badNews.add("EX-EMPLOYEES of " + company + " REVEAL that the work environment and safety regulations are not up to basic standards.");
-    badNews.add("US-Army found using " + company + " issued weapons that malfunctioned causing mass civilian casualties.");
-    badNews.add(company + " got frontpage in new forbes magazine, on top companies not to invest in.");
-    return badNews.get(random.nextInt(badNews.size()));
+    badNews.add("EX-EMPLOYEES of " + company + " REVEAL that the work environment"
+            + " and safety regulations are not up to basic standards.");
+    badNews.add("US-Army found using " + company
+            + " issued weapons that malfunctioned causing mass civilian casualties.");
+    badNews.add(company + " got frontpage in new forbes magazine, "
+            + "on top companies not to invest in.");
+
+    return badNews;
   }
 }

src/test/java/edu/ntnu/idi/idatt2003/gruppe42/model/calculator/PurchaseCalculatorTest.java

@@ -9,6 +9,12 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+/**
+ * Unit tests for {@link PurchaseCalculator}.
+ *
+ * <p>Verifies correct calculation of gross value, commission, tax, and total
+ * for a stock purchase transaction.
+ */
 public class PurchaseCalculatorTest {
   private PurchaseCalculator calculator;
 

src/test/java/edu/ntnu/idi/idatt2003/gruppe42/model/calculator/SaleCalculatorTest.java

@@ -9,6 +9,12 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+/**
+ * Unit tests for {@link SaleCalculator}.
+ *
+ * <p>Verifies correct calculation of gross value, commission, tax, and total
+ * for a stock sale transaction.
+ */
 public class SaleCalculatorTest {
   private SaleCalculator calculator;
 

src/test/java/edu/ntnu/idi/idatt2003/gruppe42/model/transaction/TransactionArchiveTest.java

@@ -10,6 +10,12 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
+/**
+ * Unit tests for {@link TransactionArchive}.
+ *
+ * <p>Verifies correct storage, filtering, and analysis of transactions
+ * including purchases and sales.
+ */
 public class TransactionArchiveTest {
   private TransactionArchive archive;
   private Purchase purchase;