From 7a95c0f347998c73916d08c6e73f5e51b401d757 Mon Sep 17 00:00:00 2001
From: Arne Juul <arnej@yahooinc.com>
Date: Fri, 12 May 2023 13:28:07 +0000
Subject: add unit test for MatchFeatureFilter

---
 .../access/helpers/MatchFeatureFilterTest.java     | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 vespajlib/src/test/java/com/yahoo/data/access/helpers/MatchFeatureFilterTest.java

diff --git a/vespajlib/src/test/java/com/yahoo/data/access/helpers/MatchFeatureFilterTest.java b/vespajlib/src/test/java/com/yahoo/data/access/helpers/MatchFeatureFilterTest.java
new file mode 100644
index 00000000000..5887a37084c
--- /dev/null
+++ b/vespajlib/src/test/java/com/yahoo/data/access/helpers/MatchFeatureFilterTest.java
@@ -0,0 +1,69 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.data.access.helpers;
+
+import com.yahoo.collections.Hashlet;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Set;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * @author arnej
+ */
+public class MatchFeatureFilterTest {
+
+    Hashlet<String,Integer> makeHash() {
+        var h = new Hashlet<String,Integer>();
+        h.put("foo", 0);
+        h.put("bar", 1);
+        h.put("baz", 2);
+        h.put("four", 4);
+        h.put("five", 5);
+        return h;
+    }
+
+    @Test
+    void testFiltering() {
+        var h1 = makeHash();
+        var h2 = makeHash();
+        var h3 = makeHash();
+        var f1 = new MatchFeatureFilter(List.of("foo", "baz", "four"));
+        var f2 = new MatchFeatureFilter(Set.of("bar", "five"));
+        var f3 = new MatchFeatureFilter(List.of("not", "bar", "nope"));
+        var fAll = new MatchFeatureFilter(Set.of("foo", "bar", "baz", "four", "five"));
+
+        var h4 = f1.apply(h1);
+        var h5 = f1.apply(h2);
+        var h6 = f1.apply(h1);
+        var h7 = f1.apply(h3);
+        assertEquals(2, h4.size());
+        assertEquals(1, h4.get("bar"));
+        assertEquals(5, h4.get("five"));
+        assertEquals(h4, h5);
+        assertEquals(h4, h6);
+        assertEquals(h4, h7);
+        // check that we get same instance out if we put the same instance in (only)
+        assertFalse(h4 == h5);
+        assertTrue(h4 == h6);
+        assertFalse(h4 == h7);
+        assertTrue(h5 == f1.apply(h2));
+        assertTrue(h7 == f1.apply(h3));
+
+        var h8 = f2.apply(h1);
+        assertEquals(3, h8.size());
+        assertEquals(0, h8.get("foo"));
+        assertEquals(2, h8.get("baz"));
+        assertEquals(4, h8.get("four"));
+        assertTrue(h8 == f2.apply(h1));
+
+        var h9 = f3.apply(h1);
+        assertEquals(4, h9.size());
+        assertNull(h9.get("bar"));
+
+        var empty = fAll.apply(h1);
+        assertEquals(0, empty.size());
+    }
+
+}
-- 
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