Remove Guava usage from DeepReflectionMatcher

1 files changed, 6 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java b/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java
index 87f7bbe..4f06efc 100644
--- a/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java
+++ b/src/main/java/org/zwobble/mammoth/internal/util/MammothSets.java
@@ -24,6 +24,12 @@ public class MammothSets {
         return set;
     }
 
+    public static <T> Set<T> difference(Set<? extends T> set1, Set<? extends T> set2) {
+        HashSet<T> result = new HashSet<>(set1);
+        result.removeAll(set2);
+        return result;
+    }
+
     public static <T> Set<T> toSet(Iterable<T> iterable) {
         return stream(iterable).collect(Collectors.toSet());
     }