Add test plans for context size donut and rate limit warning banner (0.17.0 endgame)

Author: duzitong

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

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+# Context Size Donut and Popup
+
+## Overview
+Tests the context size donut chart widget and its hover popup in the GitHub Copilot
+for Eclipse chat view. A `ContextSizeDonut` widget is rendered in the chat view's
+`ActionBar` control bar. It displays a ring that fills proportionally based on the
+token utilization percentage received via the LSP `ContextSizeInfo` payload. At
+≥90 % utilization the ring switches to a warning color. Hovering over the donut
+opens a `ContextWindowPopup` that shows a breakdown of token usage by category.
+
+Entry points:
+- **Copilot Chat view** → bottom control bar (the donut appears after the first
+  response is received that includes `ContextSizeInfo`).
+- Hover the donut to open the **Context Window** popup.
+
+---
+
+## Prerequisites
+
+- Eclipse IDE with the GitHub Copilot for Eclipse plugin installed and activated.
+- A valid GitHub Copilot subscription is active (authentication completed).
+- The Copilot Chat view is open and visible in the workbench.
+
+---
+
+## 1. Donut Widget Visibility
+
+### TC-001: Donut appears after first response
+
+**Type:** `Happy Path`
+**Priority:** `P1`
+
+#### Preconditions
+- The Copilot Chat view is open.
+- No previous conversation is loaded (fresh session or new conversation).
+
+#### Steps
+1. Open the Copilot Chat view.
+2. Confirm the donut widget is **not** visible in the bottom control bar (no
+   `ContextSizeInfo` has been received yet).
+3. Send a short chat message (e.g. "Hello") and wait for a response.
+4. Inspect the bottom control bar of the chat view.
+
+#### Expected Result
+- Before the first response the donut is not visible (or shows an empty/zero state).
+- After the first response arrives the donut widget appears in the control bar.
+- No error dialog or exception is logged.
+
+#### 📸 Key Screenshots
+- [ ] **Before response** — chat view control bar with no donut.
+- [ ] **After response** — chat view control bar showing the donut widget.
+
+---
+
+## 2. Donut Fill Proportion
+
+### TC-002: Donut ring reflects token utilization
+
+**Type:** `Happy Path`
+**Priority:** `P1`
+
+#### Preconditions
+- A conversation exists with at least one response (donut is visible).
+
+#### Steps
+1. Send a short message; note the approximate fill level of the donut ring.
+2. Send a message that attaches a large file or pastes a long code block to
+   increase context size; wait for the response.
+3. Compare the donut fill level after the larger-context response.
+
+#### Expected Result
+- The donut ring fill increases visibly when more tokens are consumed.
+- The fill level is proportional to the reported utilization percentage (0–100 %).
+
+#### 📸 Key Screenshots
+- [ ] **Low utilization** — donut with small fill.
+- [ ] **Higher utilization** — donut with larger fill.
+
+---
+
+## 3. Context Window Popup
+
+### TC-003: Hovering the donut opens the Context Window popup
+
+**Type:** `Happy Path`
+**Priority:** `P1`
+
+#### Preconditions
+- The donut widget is visible (at least one response received).
+
+#### Steps
+1. Hover the mouse cursor over the donut widget in the control bar.
+2. Wait for the popup to appear.
+3. Inspect the popup header.
+4. Inspect the popup body for: total token count, utilization percentage, progress
+   bar, and per-category rows.
+5. Move the mouse away from the donut.
+
+#### Expected Result
+- The popup opens with the header **"Context Window"**.
+- Total usage is displayed in the format `X / Y tokens`.
+- A utilization percentage is shown.
+- A progress bar reflects the utilization level.
+- Per-category rows are shown: **System Instructions**, **Tool Definitions**,
+  **Messages**, **Attached Files**, **Tool Results**.
+- Moving the mouse away closes the popup.
+
+#### 📸 Key Screenshots
+- [ ] **Popup open** — the Context Window popup showing all fields.
+
+---
+
+### TC-004: Popup shows non-zero Attached Files when a file is attached
+
+**Type:** `Happy Path`
+**Priority:** `P2`
+
+#### Preconditions
+- The chat view is open.
+
+#### Steps
+1. Send a message with at least one file attached as context.
+2. Wait for the response.
+3. Hover over the donut to open the popup.
+4. Locate the **Attached Files** row.
+
+#### Expected Result
+- The **Attached Files** row displays a non-zero token count.
+
+---
+
+### TC-005: Popup shows non-zero Tool Definitions and Tool Results in agent mode
+
+**Type:** `Happy Path`
+**Priority:** `P2`
+
+#### Preconditions
+- Agent mode is enabled in the chat view.
+
+#### Steps
+1. Send a message that triggers at least one tool call in agent mode.
+2. Wait for the response.
+3. Hover over the donut to open the popup.
+4. Locate the **Tool Definitions** and **Tool Results** rows.
+
+#### Expected Result
+- **Tool Definitions** shows a non-zero token count.
+- **Tool Results** shows a non-zero token count.
+
+---
+
+## 4. Warning Color at High Utilization
+
+### TC-006: Donut ring changes to warning color at ≥90 % utilization
+
+**Type:** `Happy Path`
+**Priority:** `P1`
+
+#### Preconditions
+- A way to produce or simulate ≥90 % token utilization (e.g. very large context,
+  or by injecting a mock `ContextSizeInfo` value via a debug breakpoint).
+
+#### Steps
+1. Bring the token utilization to ≥90 % (send large context or inject mock data).
+2. Observe the donut ring color.
+
+#### Expected Result
+- Below 90 % the ring is rendered in the normal (non-warning) color.
+- At or above 90 % the ring switches to a warning/red color.
+
+#### 📸 Key Screenshots
+- [ ] **Warning state** — donut showing warning color at high utilization.
+
+---
+
+## 5. Edge Cases
+
+### TC-007: Donut resets when a new conversation is started
+
+**Type:** `Edge Case`
+**Priority:** `P2`
+
+#### Steps
+1. Start a conversation and let the donut show some utilization.
+2. Start a new conversation (clear or new session).
+3. Observe the donut state before any new response.
+
+#### Expected Result
+- The donut resets (hidden or zero state) for the new conversation until a
+  response with `ContextSizeInfo` is received.
+
+---
+
+### TC-008: Chat view resized to narrow width
+
+**Type:** `Edge Case`
+**Priority:** `P2`
+
+#### Steps
+1. Make the chat view narrow by dragging its edge.
+2. Send a message and wait for the donut to appear.
+3. Hover over the donut to open the popup.
+
+#### Expected Result
+- The donut and control bar do not overflow or clip incorrectly.
+- The popup appears positioned near the donut without being cut off.
+
+---
+
+### TC-009: Rapid message sending does not cause stale data
+
+**Type:** `Edge Case`
+**Priority:** `P2`
+
+#### Steps
+1. Send several messages in quick succession.
+2. After all responses arrive, hover over the donut.
+
+#### Expected Result
+- The donut and popup reflect the most recent `ContextSizeInfo` without
+  stale data, race conditions, or visual glitches.