1 files changed, 64 insertions, 0 deletions

diff --git a/subprojects/logic/src/test/java/tools/refinery/logic/dnf/HashCodeTest.java b/subprojects/logic/src/test/java/tools/refinery/logic/dnf/HashCodeTest.java
new file mode 100644
index 00000000..e140be1e
--- /dev/null
+++ b/subprojects/logic/src/test/java/tools/refinery/logic/dnf/HashCodeTest.java
@@ -0,0 +1,64 @@
+/*
+ * SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package tools.refinery.logic.dnf;
+
+import org.junit.jupiter.api.Test;
+import tools.refinery.logic.Constraint;
+import tools.refinery.logic.term.NodeVariable;
+import tools.refinery.logic.term.Variable;
+import tools.refinery.logic.tests.FakeKeyOnlyView;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
+
+class HashCodeTest {
+        private static final Constraint personView = new FakeKeyOnlyView("Person", 1);
+        private static final Constraint friendView = new FakeKeyOnlyView("friend", 2);
+        private static final NodeVariable p = Variable.of("p");
+        private static final NodeVariable q = Variable.of("q");
+
+        @Test
+        void flatEqualsTest() {
+                var expected = Dnf.builder("Expected").parameters(q).clause(personView.call(q)).build();
+                var actual = Dnf.builder("Actual").parameters(p).clause(personView.call(p)).build();
+
+                assertThat(actual.hashCodeWithSubstitution(), is(expected.hashCodeWithSubstitution()));
+        }
+
+        @Test
+        void flatNotEqualsTest() {
+                var expected = Dnf.builder("Expected").parameters(q).clause(friendView.call(q, q)).build();
+                var actual = Dnf.builder("Actual").parameters(p).clause(friendView.call(p, q)).build();
+
+                assertThat(actual.hashCodeWithSubstitution(), not(expected.hashCodeWithSubstitution()));
+        }
+
+        @Test
+        void deepEqualsTest() {
+                var expected2 = Dnf.builder("Expected2").parameters(p).clause(personView.call(p)).build();
+                var expected = Dnf.builder("Expected").parameters(q).clause(
+                                expected2.call(q)
+                ).build();
+                var actual = Dnf.builder("Actual").parameters(q).clause(
+                                expected2.call(q)
+                ).build();
+
+                assertThat(actual.hashCodeWithSubstitution(), is(expected.hashCodeWithSubstitution()));
+        }
+
+        @Test
+        void deepNotEqualsTest() {
+                var expected = Dnf.builder("Expected").parameters(q).clause(
+                                Dnf.builder("Expected2").parameters(p).clause(personView.call(p)).build().call(q)
+                ).build();
+                var actual = Dnf.builder("Actual").parameters(q).clause(
+                                Dnf.builder("Actual2").parameters(p).clause(personView.call(p)).build().call(q)
+                ).build();
+
+                assertThat(actual.hashCodeWithSubstitution(), not(expected.hashCodeWithSubstitution()));
+        }
+}