diff --git a/src/renderer/src/lib/browser-uuid.test.ts b/src/renderer/src/lib/browser-uuid.test.ts
deleted file mode 100644
index 8ad0616200a..00000000000
--- a/src/renderer/src/lib/browser-uuid.test.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-import { afterEach, describe, expect, it, vi } from 'vitest'
-import { createBrowserUuid } from './browser-uuid'
-
-describe('createBrowserUuid', () => {
-  afterEach(() => {
-    vi.unstubAllGlobals()
-  })
-
-  it('uses native randomUUID when it is available', () => {
-    vi.stubGlobal('crypto', {
-      randomUUID: () => 'native-id'
-    })
-
-    expect(createBrowserUuid()).toBe('native-id')
-  })
-
-  it('falls back to getRandomValues when randomUUID is unavailable', () => {
-    vi.stubGlobal('crypto', {
-      getRandomValues: (bytes: Uint8Array) => {
-        for (let index = 0; index < bytes.length; index += 1) {
-          bytes[index] = index
-        }
-        return bytes
-      }
-    })
-
-    expect(createBrowserUuid()).toBe('00010203-0405-4607-8809-0a0b0c0d0e0f')
-  })
-})
diff --git a/src/shared/agent-skill-sharing-contract.test.ts b/src/shared/agent-skill-sharing-contract.test.ts
index 7df3af25cdf..99fae320497 100644
--- a/src/shared/agent-skill-sharing-contract.test.ts
+++ b/src/shared/agent-skill-sharing-contract.test.ts
@@ -13,6 +13,12 @@ describe('agent skill sharing contract', () => {
   })
 
   it('rejects arbitrary source paths and more than 512 explicit selectors', () => {
+    expect(
+      AgentSkillShareRequestSchema.parse({
+        skillSelectors: Array.from({ length: 512 }, (_, index) => `skill-${index}`),
+        bundleName: 'team-skills'
+      }).skillSelectors
+    ).toHaveLength(512)
     expect(
       AgentSkillShareRequestSchema.safeParse({
         skillSelectors: ['alpha'],
diff --git a/src/shared/binary-file-extensions.test.ts b/src/shared/binary-file-extensions.test.ts
index d54cd53638c..031e1c36318 100644
--- a/src/shared/binary-file-extensions.test.ts
+++ b/src/shared/binary-file-extensions.test.ts
@@ -14,8 +14,8 @@ describe('hasBinaryFileExtension', () => {
 
   it('rejects text files, dotfiles, and extensionless paths', () => {
     expect(hasBinaryFileExtension('src/index.ts')).toBe(false)
-    expect(hasBinaryFileExtension('.gitignore')).toBe(false)
-    expect(hasBinaryFileExtension('scripts/.eslintrc')).toBe(false)
+    expect(hasBinaryFileExtension('.png')).toBe(false)
+    expect(hasBinaryFileExtension('scripts/.png')).toBe(false)
     expect(hasBinaryFileExtension('Makefile')).toBe(false)
     expect(hasBinaryFileExtension(undefined)).toBe(false)
   })
diff --git a/src/shared/bundled-skill-locations.test.ts b/src/shared/bundled-skill-locations.test.ts
index 84f0c6b2cd2..1eaf7a1b1ab 100644
--- a/src/shared/bundled-skill-locations.test.ts
+++ b/src/shared/bundled-skill-locations.test.ts
@@ -26,7 +26,7 @@ describe('collapseHomePath', () => {
 })
 
 describe('bundledSkillLocation', () => {
-  it('names the shared folder and agent folders, and tells a kept link from a kept copy', () => {
+  it('describes shared updates, kept agent links, and edited locations', () => {
     expect(bundledSkillLocation(op({ kind: 'update' }), '/home/u')).toMatchObject({
       displayPath: '~/.agents/skills/orca-cli',
       place: { kind: 'shared' },
diff --git a/src/shared/uuid-v4.test.ts b/src/shared/uuid-v4.test.ts
index a12396accca..50b72551b53 100644
--- a/src/shared/uuid-v4.test.ts
+++ b/src/shared/uuid-v4.test.ts
@@ -1,25 +1,37 @@
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { createUuidV4 } from './uuid-v4'
 
-const UUID_V4 = /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/
-
 describe('createUuidV4', () => {
-  afterEach(() => vi.unstubAllGlobals())
+  afterEach(() => {
+    vi.unstubAllGlobals()
+    vi.restoreAllMocks()
+  })
 
-  it('uses the browser crypto fallback when randomUUID is unavailable', () => {
+  it('uses native randomUUID when it is available', () => {
+    vi.stubGlobal('crypto', {
+      randomUUID: () => 'native-id'
+    })
+
+    expect(createUuidV4()).toBe('native-id')
+  })
+
+  it('falls back to getRandomValues when randomUUID is unavailable', () => {
     vi.stubGlobal('crypto', {
       getRandomValues: (bytes: Uint8Array) => {
-        bytes.fill(0xab)
+        for (let index = 0; index < bytes.length; index += 1) {
+          bytes[index] = index
+        }
         return bytes
       }
     })
 
-    expect(createUuidV4()).toMatch(UUID_V4)
+    expect(createUuidV4()).toBe('00010203-0405-4607-8809-0a0b0c0d0e0f')
   })
 
   it('still returns a UUID when Web Crypto is unavailable', () => {
     vi.stubGlobal('crypto', undefined)
+    vi.spyOn(Math, 'random').mockReturnValue(255 / 256)
 
-    expect(createUuidV4()).toMatch(UUID_V4)
+    expect(createUuidV4()).toBe('ffffffff-ffff-4fff-bfff-ffffffffffff')
   })
 })