1 files changed, 69 insertions, 0 deletions
diff --git a/vespajlib/src/test/java/com/yahoo/collections/AbstractFilteringListTest.java b/vespajlib/src/test/java/com/yahoo/collections/AbstractFilteringListTest.java
new file mode 100644
index 00000000000..3f9342c5f45
--- /dev/null
+++ b/vespajlib/src/test/java/com/yahoo/collections/AbstractFilteringListTest.java
@@ -0,0 +1,69 @@
+package com.yahoo.collections;
+
+import org.junit.Test;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.Locale;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author jonmv
+ */
+public class AbstractFilteringListTest {
+
+    @Test
+    public void testOperations() {
+        MyList list = MyList.of("ABC", "abc", "cba", "bbb", "ABC");
+
+        assertEquals(List.of("ABC", "abc", "cba", "bbb", "ABC"),
+                     list.first(100).asList());
+
+        assertEquals(List.of("ABC", "abc"),
+                     list.first(2).asList());
+
+        assertEquals(List.of("cba", "bbb", "ABC"),
+                     list.not().first(2).asList());
+
+        assertEquals(List.of("ABC", "ABC", "abc", "bbb"),
+                     list.sortedBy(Comparator.naturalOrder()).first(4).asList());
+
+        assertEquals(List.of("abc", "cba", "bbb"),
+                     list.allLowercase().asList());
+
+        assertEquals(List.of("ABC", "ABC"),
+                     list.not().allLowercase().asList());
+
+        assertEquals(List.of("abc", "cba", "bbb"),
+                     list.not().not().allLowercase().asList());
+
+        assertEquals(List.of(3, 3, 3, 3, 3),
+                     list.mapToList(String::length));
+
+        assertEquals(List.of("ABC", "ABC"),
+                     list.in(MyList.of("ABC", "CBA")).asList());
+
+        assertEquals(List.of("abc", "cba", "bbb"),
+                     list.not().in(MyList.of("ABC", "CBA")).asList());
+
+        assertEquals(List.of("ABC", "abc", "cba", "bbb", "ABC", "aaa"),
+                     list.and(MyList.of("aaa")).asList());
+    }
+
+    private static class MyList extends AbstractFilteringList<String, MyList> {
+
+        private MyList(List<String> strings, boolean negate) {
+            super(strings, negate, MyList::new);
+        }
+
+        private static MyList of(String... strings) {
+            return new MyList(List.of(strings), false);
+        }
+
+        private MyList allLowercase() {
+            return matching(string -> string.toLowerCase(Locale.ROOT).equals(string));
+        }
+    }
+
+}