fix: fix tests after changes

Author: Adrià Manero

src/main/java/io/pakland/mdas/githubstats/domain/entity/CommitAggregation.java

@@ -13,18 +13,20 @@ public class CommitAggregation implements CSVExportable {
     public static CommitAggregation aggregate(List<Commit> commits) {
         CommitAggregation commitAggregation = new CommitAggregation();
         commitAggregation.numCommits = (int) commits.stream().distinct().count();
-        commitAggregation.linesAdded = commits.stream().mapToInt(Commit::getAdditions).sum();
-        commitAggregation.linesRemoved = commits.stream().mapToInt(Commit::getDeletions).sum();
         return commitAggregation;
     }
 
     public int getNumCommits() {
         return numCommits;
     }
 
-    public int getLinesAdded() { return linesAdded; }
+    public int getLinesAdded() {
+        return linesAdded;
+    }
 
-    public int getLinesRemoved() { return linesRemoved; }
+    public int getLinesRemoved() {
+        return linesRemoved;
+    }
 
     @Override
     public String toCSV() {

src/main/java/io/pakland/mdas/githubstats/domain/entity/PullRequest.java

@@ -3,7 +3,6 @@
 import io.pakland.mdas.githubstats.domain.enums.PullRequestState;
 import java.time.Instant;
 import java.util.*;
-import java.util.stream.Collectors;
 import lombok.*;
 
 @Data

src/main/java/io/pakland/mdas/githubstats/infrastructure/github/model/GitHubCommitDTO.java

@@ -9,6 +9,8 @@
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
+import java.util.Map;
+
 @Data
 @NoArgsConstructor
 @AllArgsConstructor