feat(SameFilter): add utility class SameFilter (#3391)

src/main/java/spoon/reflect/visitor/filter/SameFilter.java

@@ -0,0 +1,27 @@
+/**
+ * SPDX-License-Identifier: (MIT OR CECILL-C)
+ *
+ * Copyright (C) 2006-2019 INRIA and contributors
+ *
+ * Spoon is available either under the terms of the MIT License (see LICENSE-MIT.txt) of the Cecill-C License (see LICENSE-CECILL-C.txt). You as the user are entitled to choose the terms under which to adopt Spoon.
+ */
+package spoon.reflect.visitor.filter;
+
+import spoon.reflect.declaration.CtElement;
+import spoon.reflect.visitor.Filter;
+
+/** Finds the element given in parameter, useful for checking if an element is in an ancestor.
+ * Here "same" refers to the Junit meaning: same object memory, equals with ==
+*/
+public class SameFilter implements Filter<CtElement> {
+	private final CtElement argument2;
+
+	public SameFilter(CtElement argument2) {
+		this.argument2 = argument2;
+	}
+
+	@Override
+	public boolean matches(CtElement element) {
+		return element == argument2;
+	}
+}

src/test/java/spoon/test/replace/ReplaceParametrizedTest.java

@@ -38,7 +38,7 @@
 import spoon.reflect.reference.CtTypeReference;
 import spoon.reflect.visitor.CtScanner;
 import spoon.reflect.visitor.CtVisitable;
-import spoon.reflect.visitor.Filter;
+import spoon.reflect.visitor.filter.SameFilter;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -174,12 +174,7 @@ public void scan(CtRole role, CtElement e) {
 			argument.replace(argument2);
 
 			// the new element is indeed now in this AST
-			assertTrue(receiver.getClass().getSimpleName() + " failed for " + mmField, receiver.getElements(new Filter<CtElement>() {
-				@Override
-				public boolean matches(CtElement element) {
-					return element == argument2;
-				}
-			}).size() == 1);
+			assertTrue(receiver.getClass().getSimpleName() + " failed for " + mmField, receiver.getElements(new SameFilter(argument2)).size() == 1);
 		}
 		if (!problems.isEmpty()) {
 			fail(getReport(problems));