use ordered set to remove flakiness

HildoYe · HildoYe · commit 792a50fbe29d · 2021-10-25T18:50:26.000-05:00
diff --git a/biojava-structure/src/main/java/org/biojava/nbio/structure/symmetry/core/QuatSymmetryDetector.java b/biojava-structure/src/main/java/org/biojava/nbio/structure/symmetry/core/QuatSymmetryDetector.java
@@ -460,11 +460,11 @@ private static Stoichiometry trimSubunitClusters(Stoichiometry globalComposition
 		List<SubunitCluster> globalClusters = globalComposition.getClusters();
 		List<SubunitCluster> localClusters = new ArrayList<>();
 
-		Set<Integer> usedClusterIds =
+		TreeSet<Integer> usedClusterIds =
 				usedSubunitIds.stream().
 					map(allSubunitClusterIds::get).
 					distinct().
-					collect(Collectors.toSet());
+					collect(Collectors.toCollection(TreeSet::new));
 
 		// for each used cluster, remove unused subunits
 		for(Integer usedClusterId:usedClusterIds) {
