1 files changed, 41 insertions, 0 deletions

diff --git a/subprojects/logic/src/testFixtures/java/tools/refinery/logic/tests/StructurallyEqualTo.java b/subprojects/logic/src/testFixtures/java/tools/refinery/logic/tests/StructurallyEqualTo.java
new file mode 100644
index 00000000..257e6850
--- /dev/null
+++ b/subprojects/logic/src/testFixtures/java/tools/refinery/logic/tests/StructurallyEqualTo.java
@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.logic.tests;
+
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeMatcher;
+import tools.refinery.logic.dnf.Dnf;
+import tools.refinery.logic.equality.DeepDnfEqualityChecker;
+
+public class StructurallyEqualTo extends TypeSafeMatcher<Dnf> {
+        private final Dnf expected;
+
+        public StructurallyEqualTo(Dnf expected) {
+                this.expected = expected;
+        }
+
+        @Override
+        protected boolean matchesSafely(Dnf item) {
+                var checker = new DeepDnfEqualityChecker();
+                return checker.dnfEqual(expected, item);
+        }
+
+        @Override
+        protected void describeMismatchSafely(Dnf item, Description mismatchDescription) {
+                var describingChecker = new MismatchDescribingDnfEqualityChecker(mismatchDescription);
+                if (describingChecker.dnfEqual(expected, item)) {
+                        throw new IllegalStateException("Mismatched Dnf was matching on repeated comparison");
+                }
+                if (describingChecker.needsDescription()) {
+                        super.describeMismatchSafely(item, mismatchDescription);
+                }
+        }
+
+        @Override
+        public void describeTo(Description description) {
+                description.appendText("structurally equal to ").appendText(expected.toDefinitionString());
+        }
+}