From 83df36463281ba6206c95ad1963f6d18c1bc9ff6 Mon Sep 17 00:00:00 2001
From: Chris Reynolds <chris.reynolds@pantheon.io>
Date: Fri, 17 May 2024 09:20:41 -0600
Subject: [PATCH] [CMSP-995] Notices for low max age values in Page Cache
 Options (#268)

* add initial admin interface class
hook to mu-plugin > 1.4.0

* some more scaffolding

* require at least 6.4

* don't show notices if wp_admin_notice doesn't exist

* add notice if mu-plugin was not found

* add notice if the mu-plugin is old

* fix link and change decimal to string

* use spaces instead of line breaks

* add helper function to get current max age
this is either set in the mu-plugin or empty. if empty, it should default to 1 week

* add notice if less than 1 week but not == 600 seconds

* add docblock

* add translator comments

* update tested up to and requires at least values in readmes

* version bump

* bump composer deps

* don't display the warnings if we aren't on the pantheon cache admin page

* convert static class to a namespace
there's no reason to make this a class since we're not using any class features

* add a bootstrapper for namespace-only files

* lint

* escape the wp_die message

* use a helper for humanized time calculations

* we still need to test the current max age

* pass the current max age to the message, too
and be specific that we're talking about seconds

* use the filterable value for default max age
because it could be something different

* add a helper function for retrieving the default max age
this is helpful so we can always return the filtered value

* also display the seconds in the successful test

* rank the max age value
don't say it's "very low" unless that's actually accurate.

* add caching to the ranked compare

* make the color more severe if it's a bigger issue

* change the color of the admin notice based on the severity of the diff

* clear the transient when the option is updated

* break notice type into a variable

* fix the translator note

* keep the rank but hide it from the dom

* add unit tests

* add initial behat test
let's just see if we can assume this will work

* fix failing test

* specify the element where the notices are

* add site health check test

* actually save the changes

* remove max age check
only exists in an html comment anyway

* simplify the site health check

* add the message when you expand the accordion

* add other site health things

* change press to click?

* add "open the accordion" as a custom step

* move behat stuff around

* move stuff around again

* update the behat.yml

* remove custom context and try "when I follow"

* move to checking the text inside the elements

* target the hidden element

* use hidden='hidden'

* call it a div

* simplify the tests

* remove press
since we can't actually press

* it did actually find the right heading
maybe it will find the right text?

* add @\since tags

* add changelog and upgrade notice

* let's try checking for some of the hidden text

* period at the end of the sentence

* add the ranks back
this shows us that our ranking function is working

* add the messages

* remove age rank tests
because goutte doesn't natively interpret html comments

* add github testing badge
since phpunit is no longer run on circle

* add script to maybe skip behat tests if we don't need to run them

* add step to workflow

* do not run if the circle config changes

* also ignore if scripts (that aren't behat-related) have changed

* fix the logic (again)

* one more flippity flip

* remove the "ignoring" message
it's actually implied by the fact that is_ignored is checked

* use function to determine if a file should be ignored

Co-authored-by: Phil Tyler <phil.tyler@pantheon.io>

* update changelog to note mu-plugin updates

* Update tests/phpunit/test-admin-interface.php

* use data providers to simplify the tests

---------

Co-authored-by: Phil Tyler <phil.tyler@pantheon.io>
---
 .circleci/config.yml                   |   3 +
 README.md                              |  15 +-
 bin/maybe-skip-tests.sh                |  52 +++
 composer.lock                          | 501 +++++++++++++++----------
 inc/admin-interface.php                | 319 ++++++++++++++++
 pantheon-advanced-page-cache.php       |  47 ++-
 readme.txt                             |  11 +-
 tests/behat/admin-interface.feature    |  23 ++
 tests/behat/site-health.feature        |  28 ++
 tests/phpunit/test-admin-interface.php | 160 ++++++++
 10 files changed, 945 insertions(+), 214 deletions(-)
 create mode 100755 bin/maybe-skip-tests.sh
 create mode 100644 inc/admin-interface.php
 create mode 100644 tests/behat/admin-interface.feature
 create mode 100644 tests/behat/site-health.feature
 create mode 100644 tests/phpunit/test-admin-interface.php

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7f08bc53..fb4d15c4 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -23,6 +23,9 @@ jobs:
       - image: quay.io/pantheon-public/build-tools-ci:8.x-php8.2
     steps:
     - checkout
+    - run:
+        name: Check if we need to run Behat
+        command: ./bin/maybe-skip-tests.sh
     - restore_cache:
         keys:
           - test-behat-dependencies-{{ checksum "composer.json" }}
diff --git a/README.md b/README.md
index 245bba5e..c4e19f7f 100644
--- a/README.md
+++ b/README.md
@@ -2,9 +2,9 @@
 
 **Contributors:** [getpantheon](https://profiles.wordpress.org/getpantheon), [danielbachhuber](https://profiles.wordpress.org/danielbachhuber), [kporras07](https://profiles.wordpress.org/kporras07), [jspellman](https://profiles.wordpress.org/jspellman/), [jazzs3quence](https://profiles.wordpress.org/jazzs3quence/), [ryanshoover](https://profiles.wordpress.org/ryanshoover/), [rwagner00](https://profiles.wordpress.org/rwagner00/), [pwtyler](https://profiles.wordpress.org/pwtyler)  
 **Tags:** pantheon, cdn, cache  
-**Requires at least:** 4.7  
-**Tested up to:** 6.4.3  
-**Stable tag:** 1.5.0-dev  
+**Requires at least:** 6.4  
+**Tested up to:** 6.5.3  
+**Stable tag:** 2.0.0-dev  
 **License:** GPLv2 or later  
 **License URI:** http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -12,7 +12,9 @@ Automatically clear related pages from Pantheon's Edge when you update content.
 
 ## Description ##
 
-[![Actively Maintained](https://img.shields.io/badge/Pantheon-Actively_Maintained-yellow?logo=pantheon&color=FFDC28)](https://pantheon.io/docs/oss-support-levels#actively-maintained-support) [![CircleCI](https://circleci.com/gh/pantheon-systems/pantheon-advanced-page-cache.svg?style=svg)](https://circleci.com/gh/pantheon-systems/pantheon-advanced-page-cache)
+[![Actively Maintained](https://img.shields.io/badge/Pantheon-Actively_Maintained-yellow?logo=pantheon&color=FFDC28)](https://pantheon.io/docs/oss-support-levels#actively-maintained-support) 
+[![Lint and Test](https://github.com/pantheon-systems/pantheon-advanced-page-cache/actions/workflows/lint-test.yml/badge.svg)](https://github.com/pantheon-systems/pantheon-advanced-page-cache/actions/workflows/lint-test.yml)
+[![CircleCI](https://circleci.com/gh/pantheon-systems/pantheon-advanced-page-cache.svg?style=svg)](https://circleci.com/gh/pantheon-systems/pantheon-advanced-page-cache)
 
 For sites wanting fine-grained control over how their responses are represented in their edge cache, Pantheon Advanced Page Cache is the golden ticket. Here's a high-level overview of how the plugin works:
 
@@ -353,7 +355,10 @@ Pantheon Advanced Page Cache integrates with WordPress plugins, including:
 See [CONTRIBUTING.md](https://github.com/pantheon-systems/pantheon-advanced-page-cache/blob/master/CONTRIBUTING.md) for information on contributing.
 
 ## Changelog ##
-### 1.5.0-dev (March 11, 2024) ###
+### 2.0.0-dev ###
+* Adds new admin alerts and Site Health tests about default cache max-age settings and recommendations [[#268](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/268)]. The default Pantheon GCDN cache max-age value has been updated to 1 week in the [Pantheon MU plugin](https://github.com/pantheon-systems/pantheon-mu-plugin). For more information, see the [release note](https://docs.pantheon.io/release-notes/2024/04/pantheon-mu-plugin-1-4-0-update).
+
+### 1.5.0 (March 11, 2024) ###
 * Adds filter `pantheon_purge_post_type_ignored` to allow an array of post types to ignore before purging cache [[#258](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/258)]
 * Adds [wpunit-helpers](https://github.com/pantheon-systems/wpunit-helpers) for running/setting up WP Unit tests
 
diff --git a/bin/maybe-skip-tests.sh b/bin/maybe-skip-tests.sh
new file mode 100755
index 00000000..c49d309e
--- /dev/null
+++ b/bin/maybe-skip-tests.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+
+# Paths to ignore.
+ignored_paths=(
+  .editorconfig
+  .gitattributes
+  .gitignore
+  CODEOWNERS
+  CONTRIBUTING.md
+  LICENSE
+  phpcs.xml.dist
+  phpunit.xml.dist
+  README.md
+  readme.txt
+  .circleci/config.yml
+  bin/maybe-skip-tests.sh
+  bin/helpers.sh
+  bin/install-local-tests.sh
+  bin/install-wp-tests.sh
+  bin/phpunit-test.sh
+  .wordpress-org/*
+  .github/*
+  tests/phpunit/*
+)
+
+# Fetch list of changed files from the last commit
+changed_files=$(git diff-tree --no-commit-id --name-only -r HEAD)
+should_run_tests=true
+
+
+is_ignored_file(){
+    for ignore in "${ignored_paths[@]}"; do
+		if [[ "${1:-}" == "$ignore" ]]; then
+			return 0
+		fi
+	done
+	return 1
+}
+
+for file in $changed_files; do
+    if ! is_ignored_file "$file"; then
+		echo "Running tests because $file was changed."
+		break
+    fi
+    should_run_tests=false
+    echo "Skipping $file..."
+done
+
+if [ "$should_run_tests" = false ]; then
+  echo "Only ignored files modified. Skipping Behat tests."
+  circleci-agent step halt
+fi
diff --git a/composer.lock b/composer.lock
index bca61323..8563bfe2 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1136,16 +1136,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v5.0.1",
+            "version": "v5.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "2218c2252c874a4624ab2f613d86ac32d227bc69"
+                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/2218c2252c874a4624ab2f613d86ac32d227bc69",
-                "reference": "2218c2252c874a4624ab2f613d86ac32d227bc69",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/139676794dc1e9231bf7bcd123cfc0c99182cb13",
+                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13",
                 "shasum": ""
             },
             "require": {
@@ -1188,22 +1188,22 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v5.0.1"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.0.2"
             },
-            "time": "2024-02-21T19:24:10+00:00"
+            "time": "2024-03-05T20:51:40+00:00"
         },
         {
             "name": "pantheon-systems/pantheon-wordpress-upstream-tests",
             "version": "dev-master",
             "source": {
                 "type": "git",
-                "url": "git@github.com:pantheon-systems/pantheon-wordpress-upstream-tests.git",
-                "reference": "004fc97a604950aef4f62773417691d23b3d75b0"
+                "url": "https://github.com/pantheon-systems/pantheon-wordpress-upstream-tests.git",
+                "reference": "612d7d3e5ce064d7d30cc9752bc0e06d4a22f933"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pantheon-systems/pantheon-wordpress-upstream-tests/zipball/004fc97a604950aef4f62773417691d23b3d75b0",
-                "reference": "004fc97a604950aef4f62773417691d23b3d75b0",
+                "url": "https://api.github.com/repos/pantheon-systems/pantheon-wordpress-upstream-tests/zipball/612d7d3e5ce064d7d30cc9752bc0e06d4a22f933",
+                "reference": "612d7d3e5ce064d7d30cc9752bc0e06d4a22f933",
                 "shasum": ""
             },
             "require": {
@@ -1225,7 +1225,11 @@
                     "email": "noreply@pantheon.io"
                 }
             ],
-            "time": "2023-08-11T17:05:44+00:00"
+            "support": {
+                "issues": "https://github.com/pantheon-systems/pantheon-wordpress-upstream-tests/issues",
+                "source": "https://github.com/pantheon-systems/pantheon-wordpress-upstream-tests/tree/master"
+            },
+            "time": "2024-05-07T20:24:56+00:00"
         },
         {
             "name": "pantheon-systems/pantheon-wp-coding-standards",
@@ -1317,20 +1321,21 @@
         },
         {
             "name": "phar-io/manifest",
-            "version": "2.0.3",
+            "version": "2.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "97803eca37d319dfa7826cc2437fc020857acb53"
+                "reference": "54750ef60c58e43759730615a392c31c80e23176"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/97803eca37d319dfa7826cc2437fc020857acb53",
-                "reference": "97803eca37d319dfa7826cc2437fc020857acb53",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/54750ef60c58e43759730615a392c31c80e23176",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
+                "ext-libxml": "*",
                 "ext-phar": "*",
                 "ext-xmlwriter": "*",
                 "phar-io/version": "^3.0.1",
@@ -1371,9 +1376,15 @@
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
             "support": {
                 "issues": "https://github.com/phar-io/manifest/issues",
-                "source": "https://github.com/phar-io/manifest/tree/2.0.3"
+                "source": "https://github.com/phar-io/manifest/tree/2.0.4"
             },
-            "time": "2021-07-20T11:28:43+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:33:53+00:00"
         },
         {
             "name": "phar-io/version",
@@ -1490,28 +1501,28 @@
         },
         {
             "name": "phpcompatibility/phpcompatibility-paragonie",
-            "version": "1.3.2",
+            "version": "1.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie.git",
-                "reference": "bba5a9dfec7fcfbd679cfaf611d86b4d3759da26"
+                "reference": "293975b465e0e709b571cbf0c957c6c0a7b9a2ac"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibilityParagonie/zipball/bba5a9dfec7fcfbd679cfaf611d86b4d3759da26",
-                "reference": "bba5a9dfec7fcfbd679cfaf611d86b4d3759da26",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibilityParagonie/zipball/293975b465e0e709b571cbf0c957c6c0a7b9a2ac",
+                "reference": "293975b465e0e709b571cbf0c957c6c0a7b9a2ac",
                 "shasum": ""
             },
             "require": {
                 "phpcompatibility/php-compatibility": "^9.0"
             },
             "require-dev": {
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.7",
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
                 "paragonie/random_compat": "dev-master",
                 "paragonie/sodium_compat": "dev-master"
             },
             "suggest": {
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.7 || This Composer plugin will sort out the PHP_CodeSniffer 'installed_paths' automatically.",
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0 || This Composer plugin will sort out the PHP_CodeSniffer 'installed_paths' automatically.",
                 "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
             },
             "type": "phpcodesniffer-standard",
@@ -1541,22 +1552,37 @@
             ],
             "support": {
                 "issues": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie/issues",
+                "security": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie/security/policy",
                 "source": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie"
             },
-            "time": "2022-10-25T01:46:02+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCompatibility",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                }
+            ],
+            "time": "2024-04-24T21:30:46+00:00"
         },
         {
             "name": "phpcompatibility/phpcompatibility-wp",
-            "version": "2.1.4",
+            "version": "2.1.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCompatibility/PHPCompatibilityWP.git",
-                "reference": "b6c1e3ee1c35de6c41a511d5eb9bd03e447480a5"
+                "reference": "01c1ff2704a58e46f0cb1ca9d06aee07b3589082"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibilityWP/zipball/b6c1e3ee1c35de6c41a511d5eb9bd03e447480a5",
-                "reference": "b6c1e3ee1c35de6c41a511d5eb9bd03e447480a5",
+                "url": "https://api.github.com/repos/PHPCompatibility/PHPCompatibilityWP/zipball/01c1ff2704a58e46f0cb1ca9d06aee07b3589082",
+                "reference": "01c1ff2704a58e46f0cb1ca9d06aee07b3589082",
                 "shasum": ""
             },
             "require": {
@@ -1564,10 +1590,10 @@
                 "phpcompatibility/phpcompatibility-paragonie": "^1.0"
             },
             "require-dev": {
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.7"
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0"
             },
             "suggest": {
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.7 || This Composer plugin will sort out the PHP_CodeSniffer 'installed_paths' automatically.",
+                "dealerdirect/phpcodesniffer-composer-installer": "^1.0 || This Composer plugin will sort out the PHP_CodeSniffer 'installed_paths' automatically.",
                 "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
             },
             "type": "phpcodesniffer-standard",
@@ -1596,9 +1622,24 @@
             ],
             "support": {
                 "issues": "https://github.com/PHPCompatibility/PHPCompatibilityWP/issues",
+                "security": "https://github.com/PHPCompatibility/PHPCompatibilityWP/security/policy",
                 "source": "https://github.com/PHPCompatibility/PHPCompatibilityWP"
             },
-            "time": "2022-10-24T09:00:36+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCompatibility",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                }
+            ],
+            "time": "2024-04-24T21:37:59+00:00"
         },
         {
             "name": "phpcsstandards/phpcsextra",
@@ -1680,22 +1721,22 @@
         },
         {
             "name": "phpcsstandards/phpcsutils",
-            "version": "1.0.9",
+            "version": "1.0.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCSStandards/PHPCSUtils.git",
-                "reference": "908247bc65010c7b7541a9551e002db12e9dae70"
+                "reference": "c457da9dabb60eb7106dd5e3c05132b1a6539c6a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/908247bc65010c7b7541a9551e002db12e9dae70",
-                "reference": "908247bc65010c7b7541a9551e002db12e9dae70",
+                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/c457da9dabb60eb7106dd5e3c05132b1a6539c6a",
+                "reference": "c457da9dabb60eb7106dd5e3c05132b1a6539c6a",
                 "shasum": ""
             },
             "require": {
                 "dealerdirect/phpcodesniffer-composer-installer": "^0.4.1 || ^0.5 || ^0.6.2 || ^0.7 || ^1.0",
                 "php": ">=5.4",
-                "squizlabs/php_codesniffer": "^3.8.0 || 4.0.x-dev@dev"
+                "squizlabs/php_codesniffer": "^3.9.0 || 4.0.x-dev@dev"
             },
             "require-dev": {
                 "ext-filter": "*",
@@ -1764,20 +1805,20 @@
                     "type": "open_collective"
                 }
             ],
-            "time": "2023-12-08T14:50:00+00:00"
+            "time": "2024-04-24T11:47:18+00:00"
         },
         {
             "name": "phpstan/phpdoc-parser",
-            "version": "1.26.0",
+            "version": "1.29.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpdoc-parser.git",
-                "reference": "231e3186624c03d7e7c890ec662b81e6b0405227"
+                "reference": "536889f2b340489d328f5ffb7b02bb6b183ddedc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpdoc-parser/zipball/231e3186624c03d7e7c890ec662b81e6b0405227",
-                "reference": "231e3186624c03d7e7c890ec662b81e6b0405227",
+                "url": "https://api.github.com/repos/phpstan/phpdoc-parser/zipball/536889f2b340489d328f5ffb7b02bb6b183ddedc",
+                "reference": "536889f2b340489d328f5ffb7b02bb6b183ddedc",
                 "shasum": ""
             },
             "require": {
@@ -1809,22 +1850,22 @@
             "description": "PHPDoc parser with support for nullable, intersection and generic types",
             "support": {
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             },
-            "time": "2023-06-06T20:28:24+00:00"
+            "time": "2024-04-05T16:36:44+00:00"
         }
     ],
     "aliases": [],
diff --git a/inc/admin-interface.php b/inc/admin-interface.php
new file mode 100644
index 00000000..be6feae2
--- /dev/null
+++ b/inc/admin-interface.php
@@ -0,0 +1,319 @@
+<?php
+/**
+ * Controller for the admin interface that builds on top of the Pantheon MU plugin.
+ *
+ * @since 2.0.0
+ * @package Pantheon_Advanced_Page_Cache
+ */
+
+namespace Pantheon_Advanced_Page_Cache\Admin_Interface;
+
+/**
+ * Kick off the important bits.
+ *
+ * @since 2.0.0
+ * @return void
+ */
+function bootstrap() {
+	// Check if wp_admin_notice exists. We've already noted that the plugin requires at least 6.4, so we're going to not display a notice if you didn't listen to the recommendation.
+	if ( ! function_exists( 'wp_admin_notice' ) ) {
+		add_filter( 'pantheon_apc_disable_admin_notices', '__return_true' );
+	}
+
+	if ( defined( 'PANTHEON_MU_PLUGIN_VERSION' ) ) {
+		// Only do things here if we've got the MU plugin and it's > 1.4.0.
+		if ( version_compare( PANTHEON_MU_PLUGIN_VERSION, '1.4.0', '>' ) ) {
+			// Do stuff, e.g. add_action().
+			add_action( 'admin_notices', __NAMESPACE__ . '\\admin_notice_maybe_recommend_higher_max_age' );
+		} else {
+			add_action( 'admin_notices', __NAMESPACE__ . '\\admin_notice_old_mu_plugin' );
+		}
+	} else {
+		add_action( 'admin_notices', __NAMESPACE__ . '\\admin_notice_no_mu_plugin' );
+	}
+
+	add_filter( 'site_status_tests', __NAMESPACE__ . '\\default_cache_max_age_test' );
+	add_action( 'update_option_pantheon-cache', __NAMESPACE__ . '\\clear_max_age_compare_cache' );
+}
+
+/**
+ * Display an admin notice if the Pantheon MU plugin was not found.
+ *
+ * @since 2.0.0
+ * @return void
+ */
+function admin_notice_no_mu_plugin() {
+	/**
+	 * Allow disabling the admin notice.
+	 *
+	 * @param bool $disable_admin_notices Whether to disable the admin notice.
+	 */
+	if ( apply_filters( 'pantheon_apc_disable_admin_notices', false ) ) {
+		return;
+	}
+
+	wp_admin_notice(
+		// translators: %s is a link to the Pantheon MU plugin.
+		sprintf( __( 'Pantheon Advanced Page Cache works best on the Pantheon platform. If you are working inside a Pantheon environment, ensure your site is using the <a href="%s">Pantheon MU plugin</a>.', 'pantheon-advanced-page-cache' ), 'https://github.com/pantheon-systems/pantheon-mu-plugin' ),
+		[
+			'type' => 'error',
+			'dismissible' => true,
+		]
+	);
+}
+
+/**
+ * Display an admin notice if the Pantheon MU plugin is out of date.
+ *
+ * @since 2.0.0
+ * @return void
+ */
+function admin_notice_old_mu_plugin() {
+	$current_screen = get_current_screen();
+
+	if ( apply_filters( 'pantheon_apc_disable_admin_notices', false ) || 'settings_page_pantheon-cache' !== $current_screen->id ) {
+		return;
+	}
+
+	$mu_plugin_version = PANTHEON_MU_PLUGIN_VERSION;
+	$message = sprintf(
+		// translators: %1$s is a link to the Pantheon MU plugin, %2$s is the version of the MU plugin.
+		__( 'You appear to have an old version of the <a href="%1$s">Pantheon MU plugin</a>. 1.4.0 or above expected but %2$s found.', 'pantheon-advanced-page-cache' ),
+		'https://github.com/pantheon-systems/pantheon-mu-plugin',
+		$mu_plugin_version
+	);
+
+	// Check if there's a composer.json file in the root of the site.
+	if ( file_exists( ABSPATH . 'composer.json' ) ) {
+		$message .= ' ' . __( 'If you are using Composer, you can update the MU plugin by running <code>composer update</code>.', 'pantheon-advanced-page-cache' );
+	} else {
+		$message .= ' ' . __( 'You should Apply Updates from the Pantheon Dashboard to get the latest version of WordPress and the Pantheon MU plugin.', 'pantheon-advanced-page-cache' );
+	}
+
+	wp_admin_notice(
+		// translators: %s is a link to the Pantheon MU plugin.
+		$message,
+		[
+			'type' => 'warning',
+			'dismissible' => true,
+		]
+	);
+}
+
+/**
+ * Display an admin notice if the max-age is less than a week but not equal to 600 seconds.
+ *
+ * @since 2.0.0
+ * @return void
+ */
+function admin_notice_maybe_recommend_higher_max_age() {
+	$current_screen = get_current_screen();
+
+	if ( apply_filters( 'pantheon_apc_disable_admin_notices', false ) || 'settings_page_pantheon-cache' !== $current_screen->id ) {
+		return;
+	}
+
+	$max_age_rank = max_age_compare();
+	$current_max_age = get_current_max_age();
+	if (
+		$max_age_rank > 0 &&
+		$current_max_age < WEEK_IN_SECONDS &&
+		$current_max_age !== 600
+	) {
+		// If the current max-age value has a rank of 3 or more (10 is the highest), we'll note that it's very low.
+		$very_low = $max_age_rank > 3 ? __( 'This is a very low value and may not be optimal for your site.', 'pantheon-advanced-page-cache' ) : '';
+		$message = sprintf(
+			// translators: %1$s is the current max-age, %2$d is the current max-age in seconds, %3$s is a message that displays if the value is very low, %44d is the recommended max age in seconds, %5$s is the humanized recommended max age, %6$s is debug information that is written to the HTML DOM but not displayed.
+			__( 'The cache max-age is currently set to %1$s (%2$s seconds). %3$s Consider increasing the cache max-age to at least %4$d seconds (%5$s).%6$s', 'pantheon-advanced-page-cache' ),
+			humanized_max_age(),
+			$current_max_age,
+			$very_low,
+			WEEK_IN_SECONDS,
+			humanized_max_age( true ),
+			sprintf( '<!-- Max Age Rank: %d -->', $max_age_rank )
+		);
+
+		// Escalating notice types based on the max-age rank.
+		$notice_type = ( $max_age_rank === 1 ? 'info' : $max_age_rank > 3 ) ? 'error' : 'warning';
+
+		wp_admin_notice(
+			$message,
+			[
+				'type' => $notice_type,
+				'dismissible' => true,
+			]
+		);
+	}
+}
+
+/**
+ * Get the current max-age value.
+ *
+ * This comes from the Pantheon mu-plugin and only exists if settings were actually saved.
+ *
+ * If the site existed prior to 1.4.0 of the mu-plugin, the default value is 600 seconds. Otherwise, the default value is 1 week.
+ *
+ * @since 2.0.0
+ * @return int
+ */
+function get_current_max_age() {
+	$options = get_option( 'pantheon-cache', [] );
+
+	// If the default_ttl option is not set, we're using the default, which is 1 week.
+	if ( ! isset( $options['default_ttl'] ) ) {
+		return get_default_max_age();
+	}
+
+	return apply_filters( 'pantheon_cache_default_max_age', $options['default_ttl'] );
+}
+
+/**
+ * Add a test to the Site Health page to check the cache max-age.
+ *
+ * @param array $tests The Site Health tests.
+ *
+ * @since 2.0.0
+ * @return array
+ */
+function default_cache_max_age_test( $tests ) {
+	$tests['direct']['pantheon_edge_cache'] = [
+		'label' => __( 'Pantheon Edge Cache', 'pantheon-advanced-page-cache' ),
+		'test' => __NAMESPACE__ . '\\test_cache_max_age',
+	];
+
+	return $tests;
+}
+
+/**
+ * Get the humanized max-age.
+ *
+ * @param bool $recommended Whether to get the recommended max-age.
+ *
+ * @since 2.0.0
+ * @return string
+ */
+function humanized_max_age( $recommended = false ) {
+	$time = time();
+	$current_max_age = $recommended ? get_default_max_age() : get_current_max_age();
+	$humanized_time = human_time_diff( $time, $time + $current_max_age );
+
+	return $humanized_time;
+}
+
+/**
+ * Get the default max-age.
+ *
+ * @since 2.0.0
+ * @return int
+ */
+function get_default_max_age() {
+	return apply_filters( 'pantheon_cache_default_max_age', WEEK_IN_SECONDS );
+}
+
+/**
+ * Compare the current max-age to the default max-age.
+ *
+ * @since 2.0.0
+ * @return int A ranked value from 0 to 10 where 0 is optimal (equal to or greater than the recommended max age) and 10 is very bad.
+ */
+function max_age_compare() {
+	$cached_rank = get_transient( 'papc_max_age_compare' );
+
+	if ( false !== $cached_rank ) {
+		return $cached_rank;
+	}
+
+	$current_max_age = get_current_max_age();
+	$default_max_age = get_default_max_age();
+	$diff = $current_max_age - $default_max_age;
+
+	if ( $diff >= 0 ) {
+		return 0;
+	}
+
+	// Rank the difference on a scale of 0 ($current_max_age >= $default_max_age) to 10 and return the rank int.
+	$rank = round( abs( $diff ) / $default_max_age * 10 );
+
+	$cached_rank = min( max( $rank, 1 ), 10 );
+	set_transient( 'papc_max_age_compare', $cached_rank, WEEK_IN_SECONDS );
+	return $cached_rank;
+}
+
+/**
+ * The GCDN cache max-age Site Health test.
+ *
+ * @since 2.0.0
+ * @return array
+ */
+function test_cache_max_age() {
+	$default_max_age = get_default_max_age();
+	$current_max_age = get_current_max_age();
+	$humanized_time = humanized_max_age();
+	$humanized_reccomended_time = humanized_max_age( true );
+	$recommend_color = max_age_compare() > 3 ? 'red' : 'orange';
+
+	if ( $current_max_age < $default_max_age ) {
+		$result = [
+			'label' => __( 'Pantheon GCDN Cache Max-Age', 'pantheon-advanced-page-cache' ),
+			'status' => 'recommended',
+			'badge' => [
+				'label' => __( 'Performance', 'pantheon-advanced-page-cache' ),
+				'color' => $recommend_color,
+			],
+			'description' => sprintf(
+				// translators: %1$s is the current max-age, %2$s is the recommended max-age, %3$d is the recommended max-age in seconds.
+				__( 'The Pantheon GCDN cache max-age is currently set to %1$s (%2$d seconds). We recommend increasing to %3$s (%4$d seconds).', 'pantheon-advanced-page-cache' ),
+				$humanized_time,
+				$current_max_age,
+				$humanized_reccomended_time,
+				$default_max_age
+			),
+			'test' => 'pantheon_edge_cache',
+		];
+
+		return $result;
+	}
+
+	$result = [
+		'label' => sprintf(
+			// translators: %s is the humanized time.
+			__( 'Pantheon GCDN Cache Max-Age set to %1$s', 'pantheon-advanced-page-cache' ),
+			$humanized_time,
+			$humanized_reccomended_time
+		),
+		'status' => 'good',
+		'badge' => [
+			'label' => __( 'Performance', 'pantheon-advanced-page-cache' ),
+			'color' => 'blue',
+		],
+		'description' => sprintf(
+			'%1$s<br />%2$s',
+			sprintf(
+				// translators: %1$s is the current max-age, %2$s is the recommended max-age, %3$d is the recommended max-age in seconds.
+				__( 'The Pantheon cache max-age is currently set to %1$s (%2$s seconds). Our recommendation is %3$s (%4$d seconds) or more.', 'pantheon-advanced-page-cache' ),
+				$humanized_time,
+				$current_max_age,
+				$humanized_reccomended_time,
+				$default_max_age
+			),
+			sprintf(
+				// translators: %s is a link to the cache configuration guide.
+				__( 'View our <a href="%s">cache configuration guide</a> for more information.', 'pantheon-advanced-page-cache' ),
+				'https://docs.pantheon.io/guides/wordpress-configurations/wordpress-cache-plugin#pantheon-page-cache-plugin-configuration'
+			)
+		),
+		'test' => 'pantheon_edge_cache',
+	];
+
+	return $result;
+}
+
+/**
+ * Clear the max-age compare cache when the max-age is updated.
+ *
+ * @since 2.0.0
+ * @return void
+ */
+function clear_max_age_compare_cache() {
+	delete_transient( 'papc_max_age_compare' );
+}
diff --git a/pantheon-advanced-page-cache.php b/pantheon-advanced-page-cache.php
index b574ff34..06b130ff 100644
--- a/pantheon-advanced-page-cache.php
+++ b/pantheon-advanced-page-cache.php
@@ -1,13 +1,15 @@
 <?php
 /**
- * Plugin Name:     Pantheon Advanced Page Cache
- * Plugin URI:      https://wordpress.org/plugins/pantheon-advanced-page-cache/
- * Description:     Automatically clear related pages from Pantheon's Edge when you update content. High TTL. Fresh content. Visitors never wait.
- * Author:          Pantheon
- * Author URI:      https://pantheon.io
- * Text Domain:     pantheon-advanced-page-cache
- * Domain Path:     /languages
- * Version:         1.5.0
+ * Plugin Name: Pantheon Advanced Page Cache
+ * Plugin URI: https://wordpress.org/plugins/pantheon-advanced-page-cache/
+ * Description: Automatically clear related pages from Pantheon's Edge when you update content. High TTL. Fresh content. Visitors never wait.
+ * Author: Pantheon
+ * Author URI: https://pantheon.io
+ * Text Domain: pantheon-advanced-page-cache
+ * Domain Path: /languages
+ * Version: 2.0.0
+ * Requires at least: 6.4
+ * Tested up to: 6.5.3
  *
  * @package         Pantheon_Advanced_Page_Cache
  */
@@ -100,6 +102,30 @@ function pantheon_wp_prefix_surrogate_keys_with_blog_id( $keys ) {
 	return $prefixed_keys;
 }
 
+/**
+ * Bootstrapper for namespaced files that aren't classes.
+ *
+ * Expects that a bootstrap() function exists in the namespaced file.
+ *
+ * @since 2.0.0
+ * @return void
+ */
+function pantheon_bootstrap_namespaces() {
+	$namespaced_files = [
+		'\\Pantheon_Advanced_Page_Cache\\Admin_Interface' => __DIR__ . '/inc/admin-interface.php',
+	];
+
+	foreach ( $namespaced_files as $namespace => $file ) {
+		if ( file_exists( $file ) ) {
+			require $file;
+			call_user_func( $namespace . '\\bootstrap' );
+		} else {
+			wp_die( esc_html( "Could not find $file" ), 'Pantheon Advanced Page Cache error' );
+
+		}
+	}
+}
+
 /**
  * Registers the class autoloader.
  */
@@ -122,6 +148,11 @@ function ( $class_autoloader ) {
 	}
 );
 
+/**
+ * Init namespaced files.
+ */
+add_action( 'plugins_loaded', 'pantheon_bootstrap_namespaces' );
+
 /**
  * Registers relevant UI
  */
diff --git a/readme.txt b/readme.txt
index cf1c1f43..2dc976d3 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,9 +1,9 @@
 === Pantheon Advanced Page Cache ===
 Contributors: getpantheon, danielbachhuber, kporras07, jspellman, jazzs3quence, ryanshoover, rwagner00, pwtyler
 Tags: pantheon, cdn, cache
-Requires at least: 4.7
-Tested up to: 6.4.3
-Stable tag: 1.5.0
+Requires at least: 6.4
+Tested up to: 6.5.3
+Stable tag: 2.0.0
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -332,6 +332,9 @@ Pantheon Advanced Page Cache integrates with WordPress plugins, including:
 See [CONTRIBUTING.md](https://github.com/pantheon-systems/wp-saml-auth/blob/master/CONTRIBUTING.md) for information on contributing.
 
 == Changelog ==
+= 2.0.0-dev =
+* Adds new admin alerts and Site Health tests about default cache max-age settings and recommendations [[#268](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/268)]. The default Pantheon GCDN cache max-age value has been updated to 1 week in the [Pantheon MU plugin](https://github.com/pantheon-systems/pantheon-mu-plugin). For more information, see the [release note](https://docs.pantheon.io/release-notes/2024/04/pantheon-mu-plugin-1-4-0-update).
+
 = 1.5.0 (11 March 2024) =
 * Adds filter `pantheon_purge_post_type_ignored` to allow an array of post types to ignore before purging cache [[#258](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/258)]
 * Adds [wpunit-helpers](https://github.com/pantheon-systems/wpunit-helpers) for running/setting up WP Unit tests
@@ -409,6 +412,8 @@ See [CONTRIBUTING.md](https://github.com/pantheon-systems/wp-saml-auth/blob/mast
 * Initial release.
 
 == Upgrade Notice ==
+= 2.0.0 =
+This release requires a minimum WordPress version of 6.4.0. It uses Site Health checks and the `wp_admin_notices` function to alert users to the new cache max-age default settings and recommendations. The plugin will still function with earlier versions, but you will not get the benefit of the alerts and Site Health checks.
 
 = Latest =
 Note that the Pantheon Advanced Page Cache 1.3.0 release now prefixes keys on a WordPress Multisite (WPMS) with the blog ID. For users who already have this plugin installed on a WPMS, they will need to click the Clear Cache button on the settings page to generate the prefixed keys.
diff --git a/tests/behat/admin-interface.feature b/tests/behat/admin-interface.feature
new file mode 100644
index 00000000..044f877f
--- /dev/null
+++ b/tests/behat/admin-interface.feature
@@ -0,0 +1,23 @@
+Feature: Adjust the Default Max Age setting
+
+Background:
+	Given I log in as an admin
+
+Scenario: Change the cache max age
+	When I go to "/wp-admin/options-general.php?page=pantheon-cache"
+	And I fill in "pantheon-cache[default_ttl]" with "300"
+	And I press "Save Changes"
+	Then I should see "This is a very low value and may not be optimal for your site" in the ".notice" element
+	And I should see "Consider increasing the cache max-age to at least 604800 seconds (1 week)" in the ".notice" element
+
+Scenario: Change the cache max age to 5 days
+	When I go to "/wp-admin/options-general.php?page=pantheon-cache"
+	And I fill in "pantheon-cache[default_ttl]" with "432000"
+	And I press "Save Changes"
+	Then I should see "Consider increasing the cache max-age to at least 604800 seconds (1 week)" in the ".notice" element
+
+Scenario: Change the cache max age to 1 week
+	When I go to "/wp-admin/options-general.php?page=pantheon-cache"
+	And I fill in "pantheon-cache[default_ttl]" with "604800"
+	And I press "Save Changes"
+	Then I should see "Settings saved."
diff --git a/tests/behat/site-health.feature b/tests/behat/site-health.feature
new file mode 100644
index 00000000..a07875be
--- /dev/null
+++ b/tests/behat/site-health.feature
@@ -0,0 +1,28 @@
+Feature: Site Health tests based on Cache Max Age
+
+Background:
+	Given I log in as an admin
+
+Scenario: Site Health should report when Max Age is a low value
+	When I go to "/wp-admin/options-general.php?page=pantheon-cache"
+	And I fill in "pantheon-cache[default_ttl]" with "300"
+	And I press "Save Changes"
+	And I go to "/wp-admin/site-health.php"
+	Then I should see "Pantheon GCDN Cache Max-Age"
+	And I should see "The Pantheon GCDN cache max-age is currently set to 5 mins (300 seconds). We recommend increasing to 1 week (604800 seconds)"
+
+Scenario: Site Health should report when Max age is less than the recommendation
+	When I go to "/wp-admin/options-general.php?page=pantheon-cache"
+	And I fill in "pantheon-cache[default_ttl]" with "432000"
+	And I press "Save Changes"
+	And I go to "/wp-admin/site-health.php"
+	Then I should see "Pantheon GCDN Cache Max-Age"
+	And I should see "The Pantheon GCDN cache max-age is currently set to 5 days (432000 seconds). We recommend increasing to 1 week (604800 seconds)"
+
+Scenario: Site Health check should pass when Max Age is the recommneded value
+	When I go to "/wp-admin/options-general.php?page=pantheon-cache"
+	And I fill in "pantheon-cache[default_ttl]" with "604800"
+	And I press "Save Changes"
+	And I go to "/wp-admin/site-health.php"
+	Then I should see "Pantheon GCDN Cache Max-Age set to 1 week"
+	And I should see "The Pantheon cache max-age is currently set to 1 week (604800 seconds). Our recommendation is 1 week (604800 seconds) or more."
diff --git a/tests/phpunit/test-admin-interface.php b/tests/phpunit/test-admin-interface.php
new file mode 100644
index 00000000..8da3f335
--- /dev/null
+++ b/tests/phpunit/test-admin-interface.php
@@ -0,0 +1,160 @@
+<?php
+/**
+ * Tests for the admin interface namespace.
+ *
+ * @package Pantheon_Advanced_Page_Cache
+ */
+
+namespace Pantheon_Advanced_Page_Cache\Admin_Interface;
+
+/**
+ * Tests for the admin interface namespace..
+ */
+class Admin_Interface_Functions extends \Pantheon_Advanced_Page_Cache_Testcase {
+	/**
+	 * Set up tests.
+	 */
+	public function setUp(): void {
+		parent::setUp();
+		update_option( 'pantheon-cache', [ 'default_ttl' => 300 ] );
+	}
+
+	/**
+	 * Tear down tests.
+	 */
+	public function tearDown(): void {
+		parent::tearDown();
+		delete_option( 'pantheon-cache' );
+		delete_transient( 'papc_max_age_compare' );
+	}
+
+	/**
+	 * Test the get_current_max_age and get_default_max_age functions.
+	 */
+	public function test_get_max_age() {
+		$this->assertEquals( 300, get_current_max_age() );
+		$this->assertNotEquals( get_default_max_age(), get_current_max_age() );
+		$this->assertEquals( WEEK_IN_SECONDS, get_default_max_age() );
+	}
+
+	/**
+	 * Test the Site Health tests with very low cache max age.
+	 */
+	public function test_site_health_tests_300_seconds() {
+		$tests = apply_filters( 'site_status_tests', [] );
+
+		$this->assertContains( 'pantheon_edge_cache', array_keys( $tests['direct'] ) );
+
+		// Base test with 300 second max-age.
+		$test_results = test_cache_max_age();
+		$this->assertEquals( 'recommended', $test_results['status'] );
+		$this->assertEquals( 'red',$test_results['badge']['color'] );
+		$this->assertStringContainsString( '300 seconds', $test_results['description'] );
+		$this->assertStringContainsString( 'We recommend increasing to 1 week', $test_results['description'] );
+	}
+
+	/**
+	 * Test the Site Health tests with 5 day cache max age.
+	 */
+	public function test_site_health_tests_5_days() {
+		// Update the option and rerun.
+		update_option( 'pantheon-cache', [ 'default_ttl' => 5 * DAY_IN_SECONDS ] );
+		$test_results = test_cache_max_age();
+		$this->assertEquals( 'recommended', $test_results['status'] );
+		$this->assertEquals( 'orange',$test_results['badge']['color'] );
+		$this->assertStringContainsString( '5 days', $test_results['description'] );
+		$this->assertStringContainsString( 'We recommend increasing to 1 week', $test_results['description'] );
+	}
+
+	/**
+	 * Test the Site Health tests with 1 week cache max age.
+	 */
+	public function test_site_health_tests_1_week() {
+		// Update the option to the default and rerun.
+		update_option( 'pantheon-cache', [ 'default_ttl' => WEEK_IN_SECONDS ] );
+		$test_results = test_cache_max_age();
+		$this->assertEquals( 'good', $test_results['status'] );
+		$this->assertEquals( 'blue',$test_results['badge']['color'] );
+		$this->assertStringContainsString( '1 week', $test_results['label'] );
+		$this->assertStringContainsString( 'Pantheon GCDN Cache Max-Age set to 1 week', $test_results['label'] );
+	}
+
+	/**
+	 * Test the humanized_max_age function.
+	 *
+	 * @dataProvider humanized_max_age_provider
+	 */
+	public function test_humanized_max_age( $max_age, $expected ) {
+		update_option( 'pantheon-cache', [ 'default_ttl' => $max_age ] );
+		$this->assertEquals( $expected, humanized_max_age() );
+	}
+
+	/**
+	 * Data provider for test_humanized_max_age.
+	 *
+	 * @return array
+	 */
+	public function humanized_max_age_provider() {
+		return [
+			[ 300, '5 mins' ], // 300 seconds is humanized to 5 mins.
+			[ 5 * DAY_IN_SECONDS, '5 days' ],
+			[ WEEK_IN_SECONDS, '1 week' ],
+		];
+	}
+
+	/**
+	 * Test the max_age_compare function.
+	 *
+	 * @dataProvider max_age_compare_provider
+	 */
+	public function test_max_age_compare( $max_age, $expected ){
+		update_option( 'pantheon-cache', [ 'default_ttl' => $max_age ] );
+		$this->assertEquals( $expected, max_age_compare() );
+	}
+
+	/**
+	 * Data provider for test_max_age_compare.
+	 *
+	 * @return array
+	 */
+	public function max_age_compare_provider() {
+		return [
+			[ 300, 10 ], // 300 seconds is bad. It should rank the highest.
+			[ 5 * DAY_IN_SECONDS, 3 ], // 5 days is better.
+			[ WEEK_IN_SECONDS, 0 ], // Default recommendation should always return 0.
+			[ 2 * WEEK_IN_SECONDS, 0 ], // More than the recommendation is also good and should always return 0.
+		];
+	}
+
+	/**
+	 * Test the delete transient on option update hook.
+	 *
+	 * @dataProvider delete_transient_on_option_update_provider
+	 */
+	public function test_delete_transient_on_option_update( $expected, $max_age ) {
+		update_option( 'pantheon-cache', [ 'default_ttl' => $max_age] );
+		max_age_compare();
+		$cached_max_age_compare = get_transient( 'papc_max_age_compare' );
+		// When the max_age_compare rank is zero, which is the case when it is at least the recommended 1 week, the transient will be deleted.
+		if ( $max_age === WEEK_IN_SECONDS ) {
+			$this->assertFalse( $cached_max_age_compare );
+		} else {
+			$this->assertNotFalse( $cached_max_age_compare );
+		}
+		$this->assertEquals( $expected, $cached_max_age_compare );
+	}
+
+	/**
+	 * Data provider for delete_transient_on_option_update.
+	 *
+	 * @return array
+	 */
+	public function delete_transient_on_option_update_provider() {
+		return [
+			[ 10, 300 ],
+			[ 3, 5 * DAY_IN_SECONDS ],
+			[ 0, WEEK_IN_SECONDS ],
+		];
+	}
+
+}