diff --git a/src/components/AIMentorWidget.tsx b/src/components/AIMentorWidget.tsx
index 9e360a73..786f14d0 100644
--- a/src/components/AIMentorWidget.tsx
+++ b/src/components/AIMentorWidget.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { useState, useEffect } from "react";
+import React, { useState, useEffect } from "react";
 import DOMPurify from "dompurify";
 
 interface Insight {
diff --git a/src/components/WeeklySummaryCard.tsx b/src/components/WeeklySummaryCard.tsx
index 8e8ee1ad..e60a2426 100644
--- a/src/components/WeeklySummaryCard.tsx
+++ b/src/components/WeeklySummaryCard.tsx
@@ -27,17 +27,17 @@ export default function WeeklySummaryCard() {
   const [error, setError] = useState<string | null>(null);
   const [isCollapsed, setIsCollapsed] = useState(false);
 
-const maxCommits = summary?.commits
-  ? Math.max(summary.commits.current, summary.commits.previous, 1)
-  : 1;
+  const maxCommits = summary?.commits
+    ? Math.max(summary.commits.current, summary.commits.previous, 1)
+    : 1;
 
-const maxPRs = summary?.prs
-  ? Math.max(summary.prs.thisWeek.merged, summary.prs.lastWeek.merged, 1)
-  : 1;
+  const maxPRs = summary?.prs
+    ? Math.max(summary.prs.thisWeek.merged, summary.prs.lastWeek.merged, 1)
+    : 1;
 
-const maxActiveDays = summary?.activeDays
-  ? Math.max(summary.activeDays.thisWeek, summary.activeDays.lastWeek, 1)
-  : 1;
+  const maxActiveDays = summary?.activeDays
+    ? Math.max(summary.activeDays.thisWeek, summary.activeDays.lastWeek, 1)
+    : 1;
 
   const fetchSummary = useCallback(() => {
     setLoading(true);
@@ -106,7 +106,7 @@ const maxActiveDays = summary?.activeDays
           <div className="mt-4 rounded-lg border border-[var(--destructive)]/20 bg-[var(--destructive)]/10 p-4 text-sm text-[var(--destructive)]">
             {error}
           </div>
-        ) : summary ? (
+        ) : (summary && summary.commits && summary.prs && summary.activeDays) ? (
           <div className="mt-4 space-y-4">
             {/* Commits Comparison */}
             <div className="rounded-lg bg-[var(--control)] p-4">
diff --git a/test/AIMentorWidget.test.ts b/test/AIMentorWidget.test.ts
new file mode 100644
index 00000000..2c393fa2
--- /dev/null
+++ b/test/AIMentorWidget.test.ts
@@ -0,0 +1,165 @@
+// @vitest-environment jsdom
+import "@testing-library/jest-dom";
+import { render, screen, waitFor, fireEvent } from "@testing-library/react";
+import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
+import { AIMentorWidget } from "@/components/AIMentorWidget";
+import React from "react";
+
+const mockAIData = {
+  data: {
+    insights: [
+      {
+        id: "insight-1",
+        type: "consistency",
+        title: "High Consistency",
+        description: "You coded 5 days in a row!",
+        severity: "positive",
+      },
+    ],
+    trend: { direction: "up", percentage: 25 },
+    aiSummary: "<h3>Weekly Focus</h3><p>Keep up the <strong>great work</strong> in <code>devtrack</code>!</p>",
+    generatedAt: "2026-06-01T07:00:00.000Z",
+  },
+};
+
+describe("AIMentorWidget Component", () => {
+  beforeEach(() => {
+    vi.stubGlobal(
+      "fetch",
+      vi.fn().mockImplementation(() =>
+        Promise.resolve({
+          ok: true,
+          status: 200,
+          json: () => Promise.resolve(mockAIData),
+        } as Response)
+      )
+    );
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+    vi.clearAllMocks();
+  });
+
+  it("renders loader initially and then renders insights and trend data", async () => {
+    render(React.createElement(AIMentorWidget));
+
+    // Loader status should exist initially
+    expect(screen.getByRole("status")).toBeInTheDocument();
+
+    await waitFor(() => {
+      // Heading AI Mentor
+      expect(screen.getByText("AI Mentor")).toBeInTheDocument();
+      // Trend text
+      expect(screen.getByText(/↑/i)).toBeInTheDocument();
+      expect(screen.getByText(/25%/i)).toBeInTheDocument();
+      // Insight card
+      expect(screen.getByText("High Consistency")).toBeInTheDocument();
+      expect(screen.getByText("You coded 5 days in a row!")).toBeInTheDocument();
+    });
+  });
+
+  it("renders safe HTML formatting post-sanitization", async () => {
+    render(React.createElement(AIMentorWidget));
+
+    await waitFor(() => {
+      // 1. Check for header element <h3>
+      const heading = screen.getByRole("heading", { level: 3 });
+      expect(heading).toBeInTheDocument();
+      expect(heading.textContent).toBe("Weekly Focus");
+
+      // 2. Check for strong element
+      const strongElement = screen.getByText("great work");
+      expect(strongElement.tagName).toBe("STRONG");
+
+      // 3. Check for code element
+      const codeElement = screen.getByText("devtrack");
+      expect(codeElement.tagName).toBe("CODE");
+    });
+  });
+
+  it("sanitizes and strips malicious script tags and event handlers from HTML", async () => {
+    const maliciousData = {
+      data: {
+        ...mockAIData.data,
+        aiSummary: `<h3>Safe Advice</h3><script>alert('malicious script')</script><img src="x" onerror="alert('onerror attack')" /><strong onclick="alert('click attack')">Safe text inside strong</strong>`,
+      },
+    };
+
+    vi.mocked(global.fetch).mockImplementationOnce(() =>
+      Promise.resolve({
+        ok: true,
+        status: 200,
+        json: () => Promise.resolve(maliciousData),
+      } as Response)
+    );
+
+    render(React.createElement(AIMentorWidget));
+
+    await waitFor(() => {
+      // The safe elements should still be rendered correctly
+      expect(screen.getByRole("heading", { level: 3 }).textContent).toBe("Safe Advice");
+      expect(screen.getByText("Safe text inside strong")).toBeInTheDocument();
+
+      // The script tag should be stripped from the DOM
+      const aiSummaryContainer = screen.getByText("Safe Advice").parentElement;
+      expect(aiSummaryContainer?.innerHTML).not.toContain("<script>");
+      
+      // The onerror and onclick attribute should be stripped
+      const img = aiSummaryContainer?.querySelector("img");
+      expect(img).toBeInTheDocument();
+      expect(img?.getAttribute("onerror")).toBeNull();
+
+      const strong = aiSummaryContainer?.querySelector("strong");
+      expect(strong).toBeInTheDocument();
+      expect(strong?.getAttribute("onclick")).toBeNull();
+    });
+  });
+
+  it("toggles collapse and expand states correctly when clicking toggle button", async () => {
+    render(React.createElement(AIMentorWidget));
+
+    await waitFor(() => {
+      expect(screen.getByText("High Consistency")).toBeInTheDocument();
+    });
+
+    const toggleBtn = screen.getByLabelText("Collapse AI Mentor");
+    expect(toggleBtn).toBeInTheDocument();
+
+    // Click collapse
+    fireEvent.click(toggleBtn);
+
+    // After collapse, the summary and insights should be hidden from view
+    await waitFor(() => {
+      expect(screen.queryByText("High Consistency")).not.toBeInTheDocument();
+      expect(screen.queryByText("Weekly Focus")).not.toBeInTheDocument();
+    });
+
+    // Button label should switch to Expand
+    const expandBtn = screen.getByLabelText("Expand AI Mentor");
+    expect(expandBtn).toBeInTheDocument();
+
+    // Click expand
+    fireEvent.click(expandBtn);
+
+    // Insights should reappear
+    await waitFor(() => {
+      expect(screen.getByText("High Consistency")).toBeInTheDocument();
+      expect(screen.getByText("Weekly Focus")).toBeInTheDocument();
+    });
+  });
+
+  it("renders fallback error message when API call fails", async () => {
+    vi.mocked(global.fetch).mockImplementationOnce(() =>
+      Promise.reject(new Error("Network Error"))
+    );
+
+    render(React.createElement(AIMentorWidget));
+
+    await waitFor(() => {
+      expect(
+        screen.getByText("AI insights are unavailable right now. Please try again later.")
+      ).toBeInTheDocument();
+    });
+  });
+});