test: add comprehensive tests for Alerts Markdown syntax and Admonition shortcode

apps/test/content/posts/alert-and-admonition-test.md

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+---
+title: "Alerts and Admonition Syntax Test"
+date: 2025-09-05T16:57:58+08:00
+draft: false
+collections:
+  - Tests
+categories:
+  - Markdown
+  - Shortcodes
+tags:
+  - Alerts
+  - Admonition
+---
+
+This article comprehensively tests the **Alerts** Markdown syntax extension and **Admonition** shortcode functionality in the FixIt theme.
+
+<!--more-->
+
+## Basic Alerts Syntax
+
+> [!NOTE]
+> Highlights information that users should take into account, even when skimming.
+
+> [!TIP]
+> Optional information to help a user be more successful.
+
+> [!IMPORTANT]
+> Crucial information necessary for users to succeed.
+
+> [!WARNING]
+> Critical content demanding immediate user attention due to potential risks.
+
+> [!CAUTION]
+> Negative potential consequences of an action.
+
+## Extended Alerts Syntax
+
+### Custom Titles
+
+> [!NOTE] FixIt
+> A clean, elegant but advanced Hugo theme.
+
+> [!TIP] This is a title-only alert
+
+### Foldable Alerts
+
+Create foldable alerts by adding a plus (+) or minus (-) directly after the type identifier:
+
+> [!WARNING]+ Radiation Hazard
+> Do not approach or handle without protective gear.
+
+> [!QUESTION]- Are alerts foldable?
+> Yes! In a foldable alert, the contents are hidden when collapsed.
+
+### Nested Alerts
+
+Alerts can be nested in multiple levels:
+
+> [!question] Can alerts be nested?
+> > [!todo] Yes! They can be nested.
+> > > [!example] You can even use multiple layers of nesting.
+
+### Supported types
+
+> [!note]+
+> This is a note type alert example.
+
+> [!abstract]-
+> This is an abstract type alert example. Aliases: `summary`, `tldr`
+
+> [!info]-
+> This is an info type alert example.
+
+> [!todo]-
+> This is a todo type alert example.
+
+> [!tip]-
+> This is a tip type alert example. Aliases: `hint`, `important`
+
+> [!success]-
+> This is a success type alert example. Aliases: `check`, `done`
+
+> [!question]-
+> This is a question type alert example. Aliases: `help`, `faq`
+
+> [!warning]-
+> This is a warning type alert example. Aliases: `caution`, `attention`
+
+> [!failure]-
+> This is a failure type alert example. Aliases: `fail`, `missing`
+
+> [!danger]-
+> This is a danger type alert example. Aliases: `error`
+
+> [!bug]-
+> This is a bug type alert example.
+
+> [!example]-
+> This is an example type alert example.
+
+> [!quote]-
+> This is a quote type alert example. Aliases: `cite`
+
+## Admonition Shortcode
+
+{{< admonition >}}
+This is the default note type admonition.
+{{< /admonition >}}
+
+{{< admonition abstract "" false  >}}
+This is the default abstract type admonition. Aliases: `summary`, `tldr`
+{{< /admonition >}}
+
+{{< admonition info "" false >}}
+This is the default info type admonition.
+{{< /admonition >}}
+
+{{< admonition todo "" false >}}
+This is the default todo type admonition.
+{{< /admonition >}}
+
+{{< admonition tip "" false >}}
+This is the default tip type admonition. Aliases: `hint`, `important`
+{{< /admonition >}}
+
+{{< admonition success "" false >}}
+This is the default success type admonition. Aliases: `check`, `done`
+{{< /admonition >}}
+
+{{< admonition question "" false >}}
+This is the default question type admonition. Aliases: `help`, `faq`
+{{< /admonition >}}
+
+{{< admonition warning "" false >}}
+This is the default warning type admonition. Aliases: `caution`, `attention`
+{{< /admonition >}}
+
+{{< admonition failure "" false >}}
+This is the default failure type admonition. Aliases: `fail`, `missing`
+{{< /admonition >}}
+
+{{< admonition danger "" false >}}
+This is the default danger type admonition. Aliases: `error`
+{{< /admonition >}}
+
+{{< admonition bug "" false >}}
+This is the default bug type admonition.
+{{< /admonition >}}
+
+{{< admonition example "" false >}}
+This is the default example type admonition.
+{{< /admonition >}}
+
+{{< admonition quote "" false >}}
+This is the default quote type admonition. Aliases: `cite`
+{{< /admonition >}}