add tests for set semigroup

toxyduck · toxyduck · commit 606f1e728039 · 2019-10-20T20:01:59.000+03:00
diff --git a/core/src/test/java/fj/SemigroupTest.java b/core/src/test/java/fj/SemigroupTest.java
@@ -0,0 +1,26 @@
+package fj;
+
+import fj.data.Set;
+import org.junit.Test;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+public class SemigroupTest {
+
+    @Test
+    public void intersection_semigroup_test() {
+        Semigroup<Set<Integer>> intersectionSemigroup = Semigroup.setIntersectionSemigroup();
+        Set<Integer> first = Set.set(Ord.intOrd, 1, 2, 3, 4);
+        Set<Integer> second = Set.set(Ord.intOrd, 3, 4, 5, 6);
+        assertThat(intersectionSemigroup.sum(first, second), is(Set.set(Ord.intOrd, 3, 4)));
+    }
+
+    @Test
+    public void union_semigroup_test() {
+        Semigroup<Set<Integer>> unionSemigroup = Semigroup.setSemigroup();
+        Set<Integer> first = Set.set(Ord.intOrd, 1, 2, 3, 4);
+        Set<Integer> second = Set.set(Ord.intOrd, 3, 4, 5, 6);
+        assertThat(unionSemigroup.sum(first, second), is(Set.set(Ord.intOrd, 1, 2, 3, 4, 5, 6)));
+    }
+}
