Initial commit

src/test/java/com/mzh/library/service/PermissionPolicyCheck.java

@@ -0,0 +1,25 @@
+package com.mzh.library.service;
+
+import com.mzh.library.entity.Permission;
+import com.mzh.library.entity.Role;
+
+public final class PermissionPolicyCheck {
+    private PermissionPolicyCheck() {
+    }
+
+    public static void main(String[] args) {
+        PermissionPolicy policy = new PermissionPolicy();
+
+        require(policy.allows(Role.ADMINISTRATOR, Permission.MANAGE_USERS), "administrator should manage users");
+        require(policy.allows(Role.LIBRARIAN, Permission.MANAGE_BORROWING), "librarian should manage borrowing");
+        require(!policy.allows(Role.LIBRARIAN, Permission.MANAGE_USERS), "librarian should not manage users");
+        require(policy.allows(Role.READER, Permission.VIEW_CATALOG), "reader should view catalog");
+        require(!policy.allows(Role.READER, Permission.MANAGE_BOOKS), "reader should not manage books");
+    }
+
+    private static void require(boolean condition, String message) {
+        if (!condition) {
+            throw new AssertionError(message);
+        }
+    }
+}