feat(test): attachments removal plugin

data/test-cases/plugins/attachment-remover/test-01.md

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+---
+# (Required) Ensure all values are filled up
+name: "Installation and uninstallation of the Attachments Remover Plugin"
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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-attachments-remover) 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: Free and Enterprise
+- Licensing: With or without a license
+- Hosting: Self-hosted only, Cloud does not allow plugin upload
+- Deployment: Single-server or High-Availability setup
+
+The plugin should perform its intended functionality (removing attachments) 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/attachment-remover/test-02.md

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+---
+# (Required) Ensure all values are filled up
+name: 'Verify "Remove Attachments" Post Option Availability'
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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 attachments" option is available in the "Message Actions" menu, except for:
+- System messages
+- Posts without attachment
+2. Create the above types of messages/posts and verify that the "Remove attachments" option is not present.
+
+**Expected**
+
+The "Remove attachments" option is not available in the "Message Actions" menu for system messages and posts without attachment.

data/test-cases/plugins/attachment-remover/test-03.md

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+---
+# (Required) Ensure all values are filled up
+name: "Remove Attachments from Posts"
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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 two messages: one with a single attachment and another with multiple attachments.
+2. Ensure the "Remove attachments" option is available in the menu.
+3. Select "Remove Attachments" for each post.
+
+**Expected**
+
+The "Remove attachments" option is available for both posts. Upon selection, the attachments are removed, and the post is marked as `Edited`.

data/test-cases/plugins/attachment-remover/test-04.md

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+---
+# (Required) Ensure all values are filled up
+name: "Permission-Based Attachment Removal"
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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 two messages with attachments: one where the user has permission to edit others' posts, and one without that permission.
+2. Check if the "Remove attachments" option is available.
+3. Attempt to remove attachments for both posts.
+
+**Expected**
+
+- The "Remove attachments" option is available for both posts.
+- If the user has permission, the attachment is removed, and the post is marked as `Edited`.
+- If the user lacks permission, the attachment is not removed, and a system message displays `Can't remove attachments: Not authorized`.

data/test-cases/plugins/attachment-remover/test-05.md

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+---
+# (Required) Ensure all values are filled up
+name: "Attachment Removal with Time Limit"
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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. Set a post edit time limit (e.g., `60` seconds).
+2. Post a message with an attachment and remove it within the time limit.
+3. Post another message with an attachment and attempt to remove it after the time limit.
+
+**Expected**
+
+- The "Remove attachments" option is available for both posts.
+- Removing within the time limit successfully removes the attachment, and the post is marked as `Edited`.
+- Attempting removal after the time limit fails, with a system message: `Can't remove attachments: Post is too old to edit`.

data/test-cases/plugins/attachment-remover/test-06.md

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+---
+# (Required) Ensure all values are filled up
+name: "Attachment Removal from Posts Without Text"
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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 message that has only an attachment (no text), then remove the attachment.
+2. Post a root message with only an attachment (no text), reply to this root post, and then remove the attachment from the root post.
+3. Post a root message with text, reply to it with only an attachment (no text), and then remove the attachment from the reply.
+
+**Expected**
+
+- The post that originally contained only an attachment is successfully cleared (attachment removed), marked as `Edited`, and displayed as a blank post, without being deleted.

data/test-cases/plugins/attachment-remover/test-07.md

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+---
+# (Required) Ensure all values are filled up
+name: "Verify Attachment Removal from Search and Channel Files"
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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 message with an attachment and then search for the file or click on `Channel files`.
+2. Confirm that the file is searchable and listed in `Channel files`.
+3. Remove the attachment from the post.
+
+**Expected**
+
+- The file should no longer appear in search results or be listed in `Channel files` after the attachment is removed.

data/test-cases/plugins/attachment-remover/test-08.md

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+---
+# (Required) Ensure all values are filled up
+name: "Remove Attachments via Slash Command"
+status: Active
+priority: Normal
+folder: Attachment Remover
+authors: "@saturninoabril"
+team_ownership:
+- Deployment Eng
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+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 message with an attachment, retrieve its post ID, and post a slash command `/removeattachments <post_id>`.
+
+**Expected**
+
+- No autocompletion is available when typing `/removeattachments`.
+- A dialog appears with the header `Remove Attachments` and the message `Are you sure you want to remove all attachments from this post?`, along with `Cancel` and `Remove` buttons.
+- Selecting `Cancel` keeps the attachment intact.
+- Selecting `Remove` successfully removes the attachment if all conditions for removal are met. If not, a system message is posted in the channel indicating the reason.