Implement unit tests for Glob.globMatch (#12065)

Signed-off-by: Robin Friedmann <[email protected]>

libs/common/src/test/java/org/opensearch/common/GlobTests.java

@@ -0,0 +1,60 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.common;
+
+import org.opensearch.test.OpenSearchTestCase;
+
+public class GlobTests extends OpenSearchTestCase {
+
+
+    public void testGlobMatchNoWildcard() {
+        assertTrue(Glob.globMatch("test", "test"));
+        assertFalse(Glob.globMatch("test", "testing"));
+    }
+
+
+    public void testGlobMatchWildcardAtBeginning() {
+        assertTrue(Glob.globMatch("*test", "thisisatest"));
+        assertFalse(Glob.globMatch("*test", "thisisatesting"));
+    }
+
+
+    public void testGlobMatchWildcardAtEnd() {
+        assertTrue(Glob.globMatch("test*", "testthisisa"));
+        assertFalse(Glob.globMatch("test*", "atestthisis"));
+    }
+
+
+    public void testGlobMatchWildcardAtMiddle() {
+        assertTrue(Glob.globMatch("test*ing", "testthisisaing"));
+        assertFalse(Glob.globMatch("test*ing", "testthisisa"));
+    }
+
+
+    public void testGlobMatchMultipleWildcards() {
+        assertTrue(Glob.globMatch("*test*", "thisisatesting"));
+        assertFalse(Glob.globMatch("*test*", "thisisatesing"));
+    }
+
+
+    public void testGlobMatchNullPattern() {
+        assertFalse(Glob.globMatch(null, "test"));
+    }
+
+
+    public void testGlobMatchNullString() {
+        assertFalse(Glob.globMatch("test", null));
+    }
+
+
+    public void testGlobMatchNullPatternAndString() {
+        assertFalse(Glob.globMatch(null, null));
+    }
+}
+