add test for PrefixMatcher

Author: vladak

opengrok-indexer/src/test/java/org/opengrok/indexer/search/context/PrefixMatcherTest.java

@@ -0,0 +1,47 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * See LICENSE.txt included in this distribution for the specific
+ * language governing permissions and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at LICENSE.txt.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
+ */
+package org.opengrok.indexer.search.context;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class PrefixMatcherTest {
+    @Test
+    void testMatchCaseInsensitive() {
+        PrefixMatcher matcher = new PrefixMatcher("foo", true);
+
+        assertEquals(LineMatcher.MATCHED, matcher.match("foobar"));
+        assertEquals(LineMatcher.MATCHED, matcher.match("FOObar"));
+        assertEquals(LineMatcher.NOT_MATCHED, matcher.match("ffoobar"));
+    }
+
+    @Test
+    void testMatchCaseSensitive() {
+        PrefixMatcher matcher = new PrefixMatcher("foO", false);
+
+        assertEquals(LineMatcher.MATCHED, matcher.match("foObar"));
+        assertEquals(LineMatcher.NOT_MATCHED, matcher.match("FOObar"));
+        assertEquals(LineMatcher.NOT_MATCHED, matcher.match("ffoobar"));
+    }
+}