chore: Fix sonarqube violations

Author: en-milie

src/main/java/com/endava/cats/report/ClusterCompute.java

@@ -53,7 +53,7 @@ private static List<CatsTestCaseSummary> filterNon2xxTestCases(List<CatsTestCase
                                 StringUtils.isNotBlank(tc.getResultReason()) &&
                                 (tc.getError() || tc.getWarning())
                 )
-                .collect(Collectors.toList());
+                .toList();
     }
 
     /**
@@ -78,7 +78,7 @@ private static List<Map<String, Object>> createClusterResultList(
 
         return groupedByReason.entrySet().stream()
                 .map(entry -> createResultMapForReason(entry.getKey(), entry.getValue()))
-                .collect(Collectors.toList());
+                .toList();
     }
 
     /**
@@ -198,7 +198,7 @@ private static List<Map<String, Object>> createPathList(List<CatsTestCaseSummary
                     pathMap.put("testCases", entry.getValue().toString());
                     return pathMap;
                 })
-                .collect(Collectors.toList());
+                .toList();
     }
 
     /**

src/main/java/com/endava/cats/report/ErrorSimilarityDetector.java

@@ -12,6 +12,10 @@ public class ErrorSimilarityDetector {
     private static final double JACCARD_THRESHOLD = 0.7;
     private static final double PATTERN_MATCH_BONUS = 0.2;
 
+    private ErrorSimilarityDetector() {
+        // Prevent instantiation
+    }
+
     /**
      * Compares two error messages and returns true if they are similar enough.
      *

src/test/java/com/endava/cats/report/ClusterComputeTest.java

@@ -44,7 +44,7 @@ void testCreateClustersWithWarningsCases() {
         List<Map<String, Object>> clusters = ClusterCompute.createClusters(testCases);
 
         assertThat(clusters).hasSize(1);
-        assertThat(clusters.getFirst().get("resultReason")).isEqualTo("Bad Request");
+        assertThat(clusters.getFirst()).containsEntry("resultReason", "Bad Request");
     }
 
     @Test