diff --git a/tests/webviewPanel.test.ts b/tests/webviewPanel.test.ts
new file mode 100644
index 0000000..19e2b5c
--- /dev/null
+++ b/tests/webviewPanel.test.ts
@@ -0,0 +1,111 @@
+import { describe, expect, it } from 'vitest';
+import * as vscode from 'vscode';
+import { ProofCodeWebviewPanel } from '../src/ui/webviewPanel';
+import { VerificationReport } from '../src/types';
+
+describe('ProofCodeWebviewPanel', () => {
+  it('should generate rich glassmorphic HTML containing the Impact Blast Graph and tabs', () => {
+    const mockReport: VerificationReport = {
+      timestamp: new Date().toISOString(),
+      repoRoot: '/workspace',
+      branch: 'feature/auth',
+      score: { total: 76, deductions: [] },
+      verdict: 'NEEDS_REVIEW',
+      summary: {
+        filesChanged: 2,
+        linesAdded: 30,
+        linesDeleted: 5,
+        symbolsAffected: 2,
+        apiRoutesAffected: 1,
+        testsAdded: 1,
+        testsAffected: 1,
+        highRiskCount: 0,
+        mediumRiskCount: 1,
+        lowRiskCount: 2
+      },
+      impact: {
+        changedFiles: ['/workspace/src/auth.ts'],
+        changedSymbols: [
+          {
+            symbolName: 'getUser',
+            kind: 'function',
+            filePath: '/workspace/src/auth.ts',
+            callers: [
+              { callerName: 'Dashboard', filePath: '/workspace/src/Dashboard.tsx', line: 12, hasTest: true },
+              { callerName: 'AdminPanel', filePath: '/workspace/src/AdminPanel.tsx', line: 8, hasTest: false }
+            ],
+            isApiRoute: false
+          }
+        ],
+        affectedFiles: ['/workspace/src/Dashboard.tsx', '/workspace/src/AdminPanel.tsx'],
+        affectedCallers: [],
+        affectedRoutes: [
+          {
+            routePath: '/api/auth/session',
+            method: 'GET',
+            filePath: '/workspace/src/api/auth.ts',
+            line: 5
+          }
+        ],
+        totalCallersCount: 2,
+        untestedCallersCount: 1
+      },
+      risks: [],
+      breakageRisks: [
+        {
+          id: 'BRK-1',
+          severity: 'HIGH',
+          area: 'Authentication',
+          trigger: 'getUser modified',
+          detail: 'Downstream callers at risk',
+          affectedCallersOrRoutes: ['AdminPanel']
+        }
+      ],
+      rules: [],
+      checks: {
+        typescript: { name: 'TypeScript', status: 'PASS' },
+        eslint: { name: 'ESLint', status: 'PASS' },
+        unitTests: { name: 'Unit Tests', status: 'PASS' },
+        build: { name: 'Build', status: 'PASS' }
+      }
+    };
+
+    // Instantiate panel via private constructor method or test _getHtmlForWebview
+    // We can call createOrShow with mock panel
+    const mockWebview: any = {
+      html: '',
+      onDidReceiveMessage: () => ({ dispose: () => {} }),
+      asWebviewUri: (uri: any) => uri,
+      cspSource: 'https:'
+    };
+
+    const mockPanel: any = {
+      webview: mockWebview,
+      onDidDispose: () => ({ dispose: () => {} }),
+      reveal: () => {},
+      dispose: () => {}
+    };
+
+    (vscode.window.createWebviewPanel as any) = () => mockPanel;
+
+    ProofCodeWebviewPanel.createOrShow(
+      vscode.Uri.file('/ext'),
+      mockReport,
+      async () => {},
+      async () => {}
+    );
+
+    const html = mockWebview.html;
+    expect(html).toContain('ProofCode Change Verification');
+    expect(html).toContain('id="impact-search"');
+    expect(html).toContain('All Symbols');
+    expect(html).toContain('⚠️ Untested Callers');
+    expect(html).toContain('getUser');
+    expect(html).toContain('Dashboard');
+    expect(html).toContain('AdminPanel');
+    expect(html).toContain('✓ Test Covered');
+    expect(html).toContain('⚠️ Untested Caller');
+    expect(html).toContain('/api/auth/session');
+    expect(html).toContain('💥 What Could Break');
+  });
+});