feat: tests for root post delete helper plugin

data/test-cases/plugins/post-delete-helper/test_1.md

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+---
+# (Required) Ensure all values are filled up
+name: "Installation and uninstallation of the Post Delete Helper Plugin"
+status: Active
+priority: Normal
+folder: Post Delete Helper
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P3 - Deep Functions (Do extensive scenarios work?)
+
+# (Optional)
+location: Plugins
+component: null
+tags: []
+labels: []
+tested_by_contributor: ""
+
+# (Optional) Test type and tools
+cypress: N/A
+detox: N/A
+mmctl: N/A
+playwright: N/A
+rainforest: []
+manual_test_environments: []
+
+# Do not change
+id: null
+key: null
+created_on: null
+last_updated: null
+case_hashed: null
+steps_hashed: null
+
+---
+
+**Step 1**
+
+Install Across Different Server Setups
+
+1. Obtain the plugin by either downloading it from the [repository](https://github.com/mattermost/mattermost-plugin-post-delete-helper) or by building it from source.
+2. Upload the plugin to the Mattermost server.
+3. Perform sanity check
+
+**Expected**
+
+The plugin should install and uninstall without any issues across different server setups, including:
+
+- Server Editions: All
+- Licensing: With or without a license
+- Hosting: Self-hosted only, Cloud does not allow plugin upload
+- Deployment: Single-tenant or High-Availability setup
+
+The plugin should perform its intended functionality (delete root posts without deleting the thread) correctly without errors or unexpected behavior.
+
+---
+
+**Step 2**
+
+Install Plugin on Supported and Unsupported Server Versions
+
+1. Attempt to install the plugin on both supported and unsupported Mattermost server versions.
+
+**Expected**
+
+The plugin should install successfully only on supported versions. The minimum supported server version is `6.2.1`.

data/test-cases/plugins/post-delete-helper/test_2.md

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+---
+# (Required) Ensure all values are filled up
+name: "Verify 'Remove root post' Post Option Availability"
+status: Active
+priority: Normal
+folder: Post Delete Helper
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P3 - Deep Functions (Do extensive scenarios work?)
+
+# (Optional)
+location: Plugins
+component: null
+tags: []
+labels: []
+tested_by_contributor: ""
+
+# (Optional) Test type and tools
+cypress: N/A
+detox: N/A
+mmctl: N/A
+playwright: N/A
+rainforest: []
+manual_test_environments: []
+
+# Do not change
+id: null
+key: null
+created_on: null
+last_updated: null
+case_hashed: null
+steps_hashed: null
+
+---
+
+**Step 1**
+
+1. Confirm that the "Remove root post" option is available in the "Message Actions" menu of posts, except for:
+
+- System messages
+- Not a root post
+- Root post without any reply
+- Posts where the user lacks permission to edit
+- Posts created after the edit time limit has expired
+
+2. Create posts of each type listed above and confirm that the "Remove root post" option is not available.
+
+**Expected**
+
+The "Remove root post" option should not appear in the "Message Actions" menu for the specified posts.

data/test-cases/plugins/post-delete-helper/test_3.md

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+---
+# (Required) Ensure all values are filled up
+name: "Delete a root post"
+status: Active
+priority: Normal
+folder: Post Delete Helper
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P3 - Deep Functions (Do extensive scenarios work?)
+
+# (Optional)
+location: Plugins
+component: null
+tags: []
+labels: []
+tested_by_contributor: ""
+
+# (Optional) Test type and tools
+cypress: N/A
+detox: N/A
+mmctl: N/A
+playwright: N/A
+rainforest: []
+manual_test_environments: []
+
+# Do not change
+id: null
+key: null
+created_on: null
+last_updated: null
+case_hashed: null
+steps_hashed: null
+
+---
+
+**Step 1**
+
+1. Post a root message with one or more replies. A root post could be:
+- with or without attachments
+- with or without reactions
+- with attachment only and without message
+2. Verify that the "Remove root post" option is visible in the root post's menu.
+3. Select "Remove root post".
+
+**Expected**
+
+The "Remove root post" option should be available for a root post. When selected, the root message is replaced with `*Deleted*` (default), attachments and reactions are removed, the root post is marked as `Edited`, and the thread remains unchanged. After deletion, the "Remove root post" option is no longer visible for the root post.
+
+**Step 2**
+
+1. Navigate to `System Console > PLUGINS > Post Delete Helper` and change the `Message text to be used after deletion` to a custom value (e.g. `(root post deleted)`)
+2. Post a root message with one or more replies.
+3. Verify that the "Remove root post" option is visible in the root post's menu.
+4. Select "Remove root post".
+
+**Expected**
+
+The "Remove root post" option should be available for the root post. When selected, the root message is replaced with the custom text `(root post deleted)`, the root post is marked as `Edited`, and the thread remains unchanged.

data/test-cases/plugins/post-delete-helper/test_4.md

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+---
+# (Required) Ensure all values are filled up
+name: "Permission-Based Root Post Deletion"
+status: Active
+priority: Normal
+folder: Post Delete Helper
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P3 - Deep Functions (Do extensive scenarios work?)
+
+# (Optional)
+location: Plugins
+component: null
+tags: []
+labels: []
+tested_by_contributor: ""
+
+# (Optional) Test type and tools
+cypress: N/A
+detox: N/A
+mmctl: N/A
+playwright: N/A
+rainforest: []
+manual_test_environments: []
+
+# Do not change
+id: null
+key: null
+created_on: null
+last_updated: null
+case_hashed: null
+steps_hashed: null
+
+---
+
+**Step 1**
+
+1. Create two threads: one with a root post where the user has the `Edit Own Posts` permission (configured in `System Console > Permission`), and another without such permission.
+2. Check if the "Remove root post" option is available for each root post.
+3. If available, select "Remove root post".
+
+**Expected**
+
+- The "Remove root post" option should be available only for root posts where the user has permission to edit their own posts.
+- When the root post is deleted by its own user with the correct permission, the root post message is replaced with `*Deleted*` (default), marked as `Edited`, and the thread remains unchanged.
+- If the user lacks permission, the option to delete the root post should not be available.
+
+---
+
+**Step 2**
+
+1. Post two threads: one with root post where the user has `Edit Others' Posts` permission (configured in `System Console > Permission`), and another without such permission.
+2. Verify if the "Remove root post" option is available for each root post.
+3. If available, select "Remove root post".
+
+**Expected**
+
+- The "Remove root post" option should be available only for root posts where the user has permission to edit others' posts.
+- When the root post is deleted by other user with the correct permission, the root post message is replaced with `*Deleted*` (default), marked as `Edited`, and the thread remains unchanged.
+- If the user lacks permission, the option to delete the root post of others should not be available.

data/test-cases/plugins/post-delete-helper/test_5.md

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+---
+# (Required) Ensure all values are filled up
+name: "Root Post Deletion with Time Limit"
+status: Active
+priority: Normal
+folder: Post Delete Helper
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P3 - Deep Functions (Do extensive scenarios work?)
+
+# (Optional)
+location: Plugins
+component: null
+tags: []
+labels: []
+tested_by_contributor: ""
+
+# (Optional) Test type and tools
+cypress: N/A
+detox: N/A
+mmctl: N/A
+playwright: N/A
+rainforest: []
+manual_test_environments: []
+
+# Do not change
+id: null
+key: null
+created_on: null
+last_updated: null
+case_hashed: null
+steps_hashed: null
+
+---
+
+**Step 1**
+
+1. Enable `Edit Own Posts` in `System Console > Permission` and set the `Edit Post Time Limit` (e.g., `60` seconds).
+2. Post a thread and delete the root post within the time limit.
+3. Post another thread, then verify whether the "Remove root post" option is still available after the time limit has expired.
+
+**Expected**
+
+- The "Remove root post" option should only be available within the edit time limit.
+- Deleting within the time limit successfully deleted the root post with its message replaced with `*Deleted*` (default) and the post is marked as `Edited`, and its thread remains unchanged.
+- Once the edit time limit has passed, the option to remove the root post should no longer be available.
+- These expectations apply both to users who own the post and users with permission to edit others' posts.

data/test-cases/plugins/post-delete-helper/test_6.md

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+---
+# (Required) Ensure all values are filled up
+name: "Delete Root Post via Slash Command"
+status: Active
+priority: Normal
+folder: Post Delete Helper
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P3 - Deep Functions (Do extensive scenarios work?)
+
+# (Optional)
+location: Plugins
+component: null
+tags: []
+labels: []
+tested_by_contributor: ""
+
+# (Optional) Test type and tools
+cypress: N/A
+detox: N/A
+mmctl: N/A
+playwright: N/A
+rainforest: []
+manual_test_environments: []
+
+# Do not change
+id: null
+key: null
+created_on: null
+last_updated: null
+case_hashed: null
+steps_hashed: null
+
+---
+
+**Step 1**
+
+1. Post a thread, retrieve its root post ID, and execute the slash command `/deleterootpost <root_post_id>`.
+2. After successfully deleting the root post, run the slash command again using the same deleted root post ID: `/deleterootpost <root_post_id>`.
+
+**Expected**
+
+- No autocompletion is available when typing `/deleterootpost`.
+- A dialog appears with the header `Delete Root Post` and the message `Are you sure you want to delete this post? The thread will remain.`, along with `Cancel` and `Delete` buttons.
+- Selecting `Cancel` leaves the post unchanged.
+- Selecting `Delete` successfully deletes the root post provided all deletion conditions are met. Otherwise, a system message appears in the channel indicating the reason for failure, such as:
+  - `Can't delete root post: Invalid post ID` if `root_post_id` is not valid.
+  - `Can't delete root post: Post does not exist` if `root_post_id` cannot be found.
+  - `Can't delete root post: Not authorized` if the user has no permission.
+  - `Can't delete root post: Post is too old to edit` if the edit time limit has expired.
+- After the root post is successfully deleted, executing the slash command again with the same (deleted) root post ID should:
+  - Not trigger the `Delete Root Post` dialog.
+  - Display a system message stating that the root post has already been deleted.
+
+**Step 2**
+
+1. Create a root post without any replies, retrieve its post ID, and execute the slash command `/deleterootpost <root_post_id>`.
+
+**Expected**
+
+- The `Delete Root Post` dialog should not appear, and the post should not be deleted, as the root post has no replies.
+
+
+**Step 3**
+
+1. Post a thread, retrieve the post ID of any reply within the thread, and execute the slash command `/deleterootpost <post_id>`.
+
+**Expected**
+
+- The `Delete Root Post` dialog should not appear, and the post should not be deleted, as the command is intended only for root posts.