Add FormatChecker unit test

openvidu-server/src/test/java/io/openvidu/server/test/unit/FormatCheckerTest.java

@@ -0,0 +1,33 @@
+package io.openvidu.server.test.unit;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import io.openvidu.server.utils.FormatChecker;
+
+public class FormatCheckerTest {
+
+	@Test
+	void customSessionIdFormatTest() {
+		List<String> invalidCustomSessionIds = Arrays.asList("", "session#", "session!", "session*", "'session",
+				"\"session", "sess(ion", "sess_ion)", "session:session", ";session;", "session@session", "$",
+				"&session", "ses=sion", "+", "session,", "/session", "session?", "session#", "session%", "[session]",
+				"session.", "session~", "~session", "session~1", "\\session");
+
+		List<String> validCustomSessionIds = Arrays.asList("s", "1", "-", "_", "session", "session1", "0session10",
+				"-session", "session-", "-session-", "_session", "session_", "_session_", "_-session", "session-_",
+				"123_session-1");
+
+		FormatChecker formatChecker = new FormatChecker();
+		for (String id : invalidCustomSessionIds)
+			assertFalse(formatChecker.isValidCustomSessionId(id));
+		for (String id : validCustomSessionIds)
+			assertTrue(formatChecker.isValidCustomSessionId(id));
+	}
+
+}