test - add test plans for model-picker, add context and nes

com.microsoft.copilot.eclipse.swtbot.test/test-plans/add-context/add-context.md

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+# Chat: Add Context (Attach Files)
+
+## Overview
+
+Tests the **Add Context** button in the Chat view, which lets users attach
+workspace files to a chat prompt. Attached files provide additional context to
+Copilot so it can give more relevant answers. The button is an icon-only flat
+button (tooltip: **Add Context...**) in the action bar's file reference area.
+
+After attaching, files appear as **chips** below the input area showing the
+file name and a close (×) button. Users can click a chip to open the file, or
+click × to remove it.
+
+Entry points exercised:
+- **Ctrl+Alt+I** (or status bar → **Open Chat**), then click the Add Context
+  button in the action bar.
+
+---
+
+## Prerequisites
+
+- Eclipse IDE with the GitHub Copilot for Eclipse plugin installed and
+  activated.
+- A signed-in Copilot account.
+- A Java project is open in the workspace with at least two files.
+
+---
+
+## 1. Attach files, verify chips, remove, and send with context
+
+### TC-001: Attach files via the Add Context button, verify file chips, remove a file, and send a prompt with attached context
+
+**Type:** `Happy Path`
+**Priority:** `P0`
+
+#### Preconditions
+
+- The Chat view is open.
+- The workspace contains at least two Java files.
+
+#### Steps
+
+1. Locate the **Add Context** button in the action bar (icon-only button with
+   tooltip **Add Context...**).
+2. Verify the button appears as a flat icon without a visible rectangular
+   border.
+3. Click the **Add Context** button.
+4. Verify a file picker dialog opens (title: **Search attachments**).
+5. Select two files from the workspace and click **OK**.
+6. Verify the dialog closes and two **file chips** appear below the chat input
+   area, each showing the file name and a close (×) button.
+7. Click the × button on one of the file chips.
+8. Verify that chip is removed and only one file chip remains.
+9. Click on the remaining file chip's file name.
+10. Verify the corresponding file opens (or is revealed) in the editor.
+11. Type a prompt (e.g. `explain this file`) in the chat input and click
+    **Send**.
+12. Wait for the Copilot turn to complete.
+13. Verify the response references or uses content from the attached file.
+
+#### Expected Result
+
+- The Add Context button opens the file picker dialog.
+- Selected files appear as removable chips below the input area.
+- Clicking × removes the chip.
+- Clicking the file name opens the file in the editor.
+- Sending a prompt with an attached file includes that file as context in the
+  conversation.
+
+#### 📸 Key Screenshots
+
+- [ ] **Add Context button** — flat icon button in the action bar, no border.
+- [ ] **File picker dialog** — dialog showing workspace files to select.
+- [ ] **File chips** — two file chips visible below the chat input area.
+- [ ] **After removing one chip** — only one chip remaining.
+- [ ] **Response with context** — Copilot turn that references the attached
+  file content.
+
+---
+
+## 2. Currently active file is shown automatically
+
+### TC-002: The currently open file appears as a reference in the action bar
+
+**Type:** `Happy Path`
+**Priority:** `P0`
+
+#### Preconditions
+
+- The Chat view is open.
+- A Java file is open and active in the editor.
+
+#### Steps
+
+1. Open a Java file in the editor (click on it in the Package Explorer or
+   switch to an already-open tab).
+2. Switch focus to the Chat view.
+3. Observe the file reference area in the action bar.
+
+#### Expected Result
+
+- The currently active editor file is automatically shown as a reference in
+  the action bar (displaying the file name).
+- Switching to a different file in the editor updates the displayed reference.
+
+#### 📸 Key Screenshots
+
+- [ ] **Current file reference** — the action bar showing the active file name
+  as a context reference.
+
+---
+
+## Notes on failure modes
+
+- File picker dialog does not open → the Add Context button's selection
+  listener may not be wired; check the Eclipse error log.
+- File chips do not appear after selection → the ReferencedFileService may not
+  have received the files; verify the file selection result is non-empty.
+- Clicking × does not remove the chip → the close button's mouse listener
+  may not be attached; check the ReferencedFile widget.