Add simple PolicyParser unit test

Signed-off-by: Andrew Ross <[email protected]>

Author: andrross

libs/agent-sm/agent-policy/build.gradle

@@ -22,5 +22,6 @@ base {
 
 disableTasks('forbiddenApisMain')
 
-test.enabled = false
-testingConventions.enabled = false
+dependencies {
+  testImplementation(project(":test:framework"))
+}

libs/agent-sm/agent-policy/src/test/java/org/opensearch/secure_sm/policy/PolicyParserTests.java

@@ -0,0 +1,53 @@
+/*
+ * 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.secure_sm.policy;
+
+import org.opensearch.test.OpenSearchTestCase;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.util.Enumeration;
+
+public class PolicyParserTests extends OpenSearchTestCase {
+    private static final String POLICY = """
+        grant codeBase "TestCodeBase" {
+          permission java.net.NetPermission "accessUnixDomainSocket";
+        };
+
+        grant {
+          permission java.net.NetPermission "accessUnixDomainSocket";
+          permission java.net.SocketPermission "*", "accept,connect";
+        };
+        """;
+
+    public void testPolicy() throws IOException, PolicyParser.ParsingException {
+        try (Reader reader = new StringReader(POLICY)) {
+            final PolicyParser policyParser = new PolicyParser();
+            policyParser.read(reader);
+
+            final Enumeration<PolicyParser.GrantEntry> grantEntryEnumeration = policyParser.grantElements();
+            final PolicyParser.GrantEntry grantEntry1 = grantEntryEnumeration.nextElement();
+            final PolicyParser.GrantEntry grantEntry2 = grantEntryEnumeration.nextElement();
+
+            assertEquals("TestCodeBase", grantEntry1.codeBase);
+            assertEquals(1, grantEntry1.permissionEntries.size());
+            assertEquals("java.net.NetPermission", grantEntry1.permissionEntries.getFirst().permission);
+            assertEquals("accessUnixDomainSocket", grantEntry1.permissionEntries.getFirst().name);
+
+            assertNull(grantEntry2.codeBase);
+            assertEquals(2, grantEntry2.permissionEntries.size());
+            assertEquals("java.net.NetPermission", grantEntry2.permissionEntries.getFirst().permission);
+            assertEquals("accessUnixDomainSocket", grantEntry2.permissionEntries.getFirst().name);
+            assertEquals("java.net.SocketPermission", grantEntry2.permissionEntries.getLast().permission);
+            assertEquals("*", grantEntry2.permissionEntries.getLast().name);
+            assertEquals("accept,connect", grantEntry2.permissionEntries.getLast().action);
+        }
+    }
+}