diff --git a/src/shared/utils/__tests__/retry.test.js b/src/shared/utils/__tests__/retry.test.js
new file mode 100644
index 00000000..5aed2cc1
--- /dev/null
+++ b/src/shared/utils/__tests__/retry.test.js
@@ -0,0 +1,70 @@
+import { executeWithBackoff } from '../retry';
+
+describe('executeWithBackoff', () => {
+    test('returns result on first success', async () => {
+        const fn = vi.fn().mockResolvedValue('ok');
+        const result = await executeWithBackoff(fn);
+        expect(result).toBe('ok');
+        expect(fn).toHaveBeenCalledTimes(1);
+    });
+
+    test('retries on failure then succeeds', async () => {
+        const fn = vi
+            .fn()
+            .mockRejectedValueOnce(new Error('fail'))
+            .mockRejectedValueOnce(new Error('fail'))
+            .mockResolvedValue('ok');
+
+        const result = await executeWithBackoff(fn, {
+            maxRetries: 3,
+            baseDelay: 1
+        });
+        expect(result).toBe('ok');
+        expect(fn).toHaveBeenCalledTimes(3);
+    });
+
+    test('throws after exhausting retries', async () => {
+        const fn = vi.fn().mockRejectedValue(new Error('always fails'));
+
+        await expect(
+            executeWithBackoff(fn, { maxRetries: 2, baseDelay: 1 })
+        ).rejects.toThrow('always fails');
+        expect(fn).toHaveBeenCalledTimes(3); // initial + 2 retries
+    });
+
+    test('stops retrying when shouldRetry returns false', async () => {
+        const fn = vi.fn().mockRejectedValue(new Error('permanent'));
+
+        await expect(
+            executeWithBackoff(fn, {
+                maxRetries: 5,
+                baseDelay: 1,
+                shouldRetry: () => false
+            })
+        ).rejects.toThrow('permanent');
+        expect(fn).toHaveBeenCalledTimes(1);
+    });
+
+    test('uses exponential backoff delays', async () => {
+        const delays = [];
+        const originalSetTimeout = globalThis.setTimeout;
+        vi.spyOn(globalThis, 'setTimeout').mockImplementation((fn, delay) => {
+            delays.push(delay);
+            return originalSetTimeout(fn, 0);
+        });
+
+        const mockFn = vi
+            .fn()
+            .mockRejectedValueOnce(new Error('1'))
+            .mockRejectedValueOnce(new Error('2'))
+            .mockRejectedValueOnce(new Error('3'))
+            .mockResolvedValue('done');
+
+        await executeWithBackoff(mockFn, { maxRetries: 5, baseDelay: 100 });
+
+        // Delays: 100 * 2^0, 100 * 2^1, 100 * 2^2
+        expect(delays).toEqual([100, 200, 400]);
+
+        vi.restoreAllMocks();
+    });
+});
diff --git a/src/shared/utils/__tests__/setting.test.js b/src/shared/utils/__tests__/setting.test.js
new file mode 100644
index 00000000..1e68da3e
--- /dev/null
+++ b/src/shared/utils/__tests__/setting.test.js
@@ -0,0 +1,23 @@
+import { getVRChatResolution } from '../setting';
+
+describe('getVRChatResolution', () => {
+    test.each([
+        ['1280x720', '1280x720 (720p)'],
+        ['1920x1080', '1920x1080 (1080p)'],
+        ['2560x1440', '2560x1440 (1440p)'],
+        ['3840x2160', '3840x2160 (4K)'],
+        ['7680x4320', '7680x4320 (8K)']
+    ])('maps %s to %s', (input, expected) => {
+        expect(getVRChatResolution(input)).toBe(expected);
+    });
+
+    test('returns Custom for unknown resolutions', () => {
+        expect(getVRChatResolution('1024x768')).toBe('1024x768 (Custom)');
+        expect(getVRChatResolution('800x600')).toBe('800x600 (Custom)');
+    });
+
+    test('handles empty/undefined input', () => {
+        expect(getVRChatResolution('')).toBe(' (Custom)');
+        expect(getVRChatResolution(undefined)).toBe('undefined (Custom)');
+    });
+});
diff --git a/src/shared/utils/__tests__/throttle.test.js b/src/shared/utils/__tests__/throttle.test.js
new file mode 100644
index 00000000..7e7d6384
--- /dev/null
+++ b/src/shared/utils/__tests__/throttle.test.js
@@ -0,0 +1,56 @@
+import { createRateLimiter } from '../throttle';
+
+describe('createRateLimiter', () => {
+    test('schedule executes function and returns result', async () => {
+        const limiter = createRateLimiter({
+            limitPerInterval: 10,
+            intervalMs: 1000
+        });
+        const result = await limiter.schedule(() => 42);
+        expect(result).toBe(42);
+    });
+
+    test('schedule executes async functions', async () => {
+        const limiter = createRateLimiter({
+            limitPerInterval: 10,
+            intervalMs: 1000
+        });
+        const result = await limiter.schedule(
+            () => new Promise((r) => setTimeout(() => r('async'), 10))
+        );
+        expect(result).toBe('async');
+    });
+
+    test('allows bursts up to limit', async () => {
+        const limiter = createRateLimiter({
+            limitPerInterval: 3,
+            intervalMs: 1000
+        });
+        const results = [];
+        for (let i = 0; i < 3; i++) {
+            results.push(await limiter.schedule(() => i));
+        }
+        expect(results).toEqual([0, 1, 2]);
+    });
+
+    test('clear resets the rate limiter', async () => {
+        const limiter = createRateLimiter({
+            limitPerInterval: 1,
+            intervalMs: 50
+        });
+
+        await limiter.schedule(() => 'first');
+        limiter.clear();
+        // After clear, should be able to schedule immediately
+        const result = await limiter.schedule(() => 'second');
+        expect(result).toBe('second');
+    });
+
+    test('wait resolves without executing a function', async () => {
+        const limiter = createRateLimiter({
+            limitPerInterval: 10,
+            intervalMs: 1000
+        });
+        await expect(limiter.wait()).resolves.toBeUndefined();
+    });
+});