Add server-free plugin behavior tests

src/main/java/com/majinnaibu/bukkitplugins/metropolis/PlayerLookup.java

@@ -0,0 +1,19 @@
+package com.majinnaibu.bukkitplugins.metropolis;
+
+import org.bukkit.entity.Player;
+
+final class PlayerLookup {
+	private PlayerLookup() {}
+
+	static Player findOnline(String requestedName, Iterable<? extends Player> onlinePlayers) {
+		if (requestedName == null) {
+			return null;
+		}
+		for (Player player : onlinePlayers) {
+			if (requestedName.equalsIgnoreCase(player.getName())) {
+				return player;
+			}
+		}
+		return null;
+	}
+}