Create enum classes for permission nodes

src/test/java/fr/xephi/authme/permission/AdminPermissionTest.java

@@ -0,0 +1,42 @@
+package fr.xephi.authme.permission;
+
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.Assert.fail;
+
+/**
+ * Test for {@link AdminPermission}.
+ */
+public class AdminPermissionTest {
+
+    @Test
+    public void shouldStartWithAuthMeAdminPrefix() {
+        // given
+        String requiredPrefix = "authme.admin.";
+
+        // when/then
+        for (AdminPermission perm : AdminPermission.values()) {
+            if (!perm.getNode().startsWith(requiredPrefix)) {
+                fail("The permission '" + perm + "' does not start with the required prefix '" + requiredPrefix + "'");
+            }
+        }
+    }
+
+    @Test
+    public void shouldHaveUniqueNodes() {
+        // given
+        Set<String> nodes = new HashSet<>();
+
+        // when/then
+        for (AdminPermission perm : AdminPermission.values()) {
+            if (nodes.contains(perm.getNode())) {
+                fail("More than one enum value defines the node '" + perm.getNode() + "'");
+            }
+            nodes.add(perm.getNode());
+        }
+    }
+
+}

src/test/java/fr/xephi/authme/permission/UserPermissionTest.java

@@ -0,0 +1,45 @@
+package fr.xephi.authme.permission;
+
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.Assert.fail;
+
+/**
+ * Test for {@link UserPermission}.
+ */
+public class UserPermissionTest {
+
+    @Test
+    public void shouldStartWithRegularAuthMePrefix() {
+        // given
+        String requiredPrefix = "authme.";
+        String adminPrefix = "authme.admin";
+
+        // when/then
+        for (UserPermission perm : UserPermission.values()) {
+            if (!perm.getNode().startsWith(requiredPrefix)) {
+                fail("The permission '" + perm + "' does not start with the required prefix '" + requiredPrefix + "'");
+            } else if (perm.getNode().startsWith(adminPrefix)) {
+                fail("The permission '" + perm + "' should not use a node with the admin-specific prefix '"
+                    + adminPrefix + "'");
+            }
+        }
+    }
+
+    @Test
+    public void shouldHaveUniqueNodes() {
+        // given
+        Set<String> nodes = new HashSet<>();
+
+        // when/then
+        for (UserPermission perm : UserPermission.values()) {
+            if (nodes.contains(perm.getNode())) {
+                fail("More than one enum value defines the node '" + perm.getNode() + "'");
+            }
+            nodes.add(perm.getNode());
+        }
+    }
+}