diff --git a/packages/react/src/ActionList/Group.test.tsx b/packages/react/src/ActionList/Group.test.tsx
index 7d282da6296..223ac72e80d 100644
--- a/packages/react/src/ActionList/Group.test.tsx
+++ b/packages/react/src/ActionList/Group.test.tsx
@@ -5,7 +5,7 @@ import BaseStyles from '../BaseStyles'
 import {ActionList} from '.'
 import {ActionMenu} from '..'
 import {FeatureFlags} from '../FeatureFlags'
-import {implementsClassName} from '../utils/testing'
+import {implementsClassName, withExpectedConsoleError} from '../utils/testing'
 import classes from './Group.module.css'
 
 describe('ActionList.Group', () => {
@@ -22,24 +22,26 @@ describe('ActionList.Group', () => {
   implementsClassName(ActionList.GroupHeading, classes.GroupHeading)
 
   it('should throw an error when ActionList.GroupHeading has an `as` prop when it is used within ActionMenu context', async () => {
-    expect(() =>
-      HTMLRender(
-        <BaseStyles>
-          <ActionMenu open={true}>
-            <ActionMenu.Button>Trigger</ActionMenu.Button>
-            <ActionMenu.Overlay>
-              <ActionList>
-                <ActionList.Group>
-                  <ActionList.GroupHeading as="h2">Group Heading</ActionList.GroupHeading>
-                </ActionList.Group>
-              </ActionList>
-            </ActionMenu.Overlay>
-          </ActionMenu>
-        </BaseStyles>,
-      ),
-    ).toThrow(
-      "Looks like you are trying to set a heading level to a menu role. Group headings for menu type action lists are for representational purposes, and rendered as divs. Therefore they don't need a heading level.",
-    )
+    withExpectedConsoleError(() => {
+      expect(() =>
+        HTMLRender(
+          <BaseStyles>
+            <ActionMenu open={true}>
+              <ActionMenu.Button>Trigger</ActionMenu.Button>
+              <ActionMenu.Overlay>
+                <ActionList>
+                  <ActionList.Group>
+                    <ActionList.GroupHeading as="h2">Group Heading</ActionList.GroupHeading>
+                  </ActionList.Group>
+                </ActionList>
+              </ActionMenu.Overlay>
+            </ActionMenu>
+          </BaseStyles>,
+        ),
+      ).toThrow(
+        "Looks like you are trying to set a heading level to a menu role. Group headings for menu type action lists are for representational purposes, and rendered as divs. Therefore they don't need a heading level.",
+      )
+    })
   })
 
   it('should render the ActionList.GroupHeading component as a heading with the given heading level', async () => {
@@ -56,19 +58,21 @@ describe('ActionList.Group', () => {
     expect(heading).toHaveTextContent('Group Heading')
   })
   it('should throw an error if ActionList.GroupHeading is used without an `as` prop when no role is specified (for list role)', async () => {
-    expect(() =>
-      HTMLRender(
-        <ActionList>
-          <ActionList.Heading as="h1">Heading</ActionList.Heading>
-          <ActionList.Group>
-            <ActionList.GroupHeading>Group Heading</ActionList.GroupHeading>
-            <ActionList.Item>Item</ActionList.Item>
-          </ActionList.Group>
-        </ActionList>,
-      ),
-    ).toThrow(
-      "You are setting a heading for a list, that requires a heading level. Please use 'as' prop to set a proper heading level.",
-    )
+    withExpectedConsoleError(() => {
+      expect(() =>
+        HTMLRender(
+          <ActionList>
+            <ActionList.Heading as="h1">Heading</ActionList.Heading>
+            <ActionList.Group>
+              <ActionList.GroupHeading>Group Heading</ActionList.GroupHeading>
+              <ActionList.Item>Item</ActionList.Item>
+            </ActionList.Group>
+          </ActionList>,
+        ),
+      ).toThrow(
+        "You are setting a heading for a list, that requires a heading level. Please use 'as' prop to set a proper heading level.",
+      )
+    })
   })
   it('should render the ActionList.GroupHeading component as a span (not a heading tag) when role is specified as listbox', async () => {
     const container = HTMLRender(
@@ -191,44 +195,48 @@ describe('ActionList.Group', () => {
     })
 
     it('throws when GroupHeading.TrailingAction is used inside an ActionMenu (menu role) and the feature flag is enabled', () => {
-      expect(() =>
-        HTMLRender(
-          <FeatureFlags flags={{primer_react_action_list_group_heading_trailing_action: true}}>
-            <BaseStyles>
-              <ActionMenu open={true}>
-                <ActionMenu.Button>Trigger</ActionMenu.Button>
-                <ActionMenu.Overlay>
-                  <ActionList>
-                    <ActionList.Group>
-                      <ActionList.GroupHeading>
-                        Group Heading
-                        <ActionList.GroupHeading.TrailingAction label="New field" icon={PlusIcon} />
-                      </ActionList.GroupHeading>
-                    </ActionList.Group>
-                  </ActionList>
-                </ActionMenu.Overlay>
-              </ActionMenu>
-            </BaseStyles>
-          </FeatureFlags>,
-        ),
-      ).toThrow(/can not be used inside an ActionList with an ARIA role of "menu"/)
+      withExpectedConsoleError(() => {
+        expect(() =>
+          HTMLRender(
+            <FeatureFlags flags={{primer_react_action_list_group_heading_trailing_action: true}}>
+              <BaseStyles>
+                <ActionMenu open={true}>
+                  <ActionMenu.Button>Trigger</ActionMenu.Button>
+                  <ActionMenu.Overlay>
+                    <ActionList>
+                      <ActionList.Group>
+                        <ActionList.GroupHeading>
+                          Group Heading
+                          <ActionList.GroupHeading.TrailingAction label="New field" icon={PlusIcon} />
+                        </ActionList.GroupHeading>
+                      </ActionList.Group>
+                    </ActionList>
+                  </ActionMenu.Overlay>
+                </ActionMenu>
+              </BaseStyles>
+            </FeatureFlags>,
+          ),
+        ).toThrow(/can not be used inside an ActionList with an ARIA role of "menu"/)
+      })
     })
 
     it('throws when GroupHeading.TrailingAction is used inside a listbox role and the feature flag is enabled', () => {
-      expect(() =>
-        HTMLRender(
-          <FeatureFlags flags={{primer_react_action_list_group_heading_trailing_action: true}}>
-            <ActionList role="listbox">
-              <ActionList.Group>
-                <ActionList.GroupHeading>
-                  Group Heading
-                  <ActionList.GroupHeading.TrailingAction label="New field" icon={PlusIcon} />
-                </ActionList.GroupHeading>
-              </ActionList.Group>
-            </ActionList>
-          </FeatureFlags>,
-        ),
-      ).toThrow(/can not be used inside an ActionList with an ARIA role of "listbox"/)
+      withExpectedConsoleError(() => {
+        expect(() =>
+          HTMLRender(
+            <FeatureFlags flags={{primer_react_action_list_group_heading_trailing_action: true}}>
+              <ActionList role="listbox">
+                <ActionList.Group>
+                  <ActionList.GroupHeading>
+                    Group Heading
+                    <ActionList.GroupHeading.TrailingAction label="New field" icon={PlusIcon} />
+                  </ActionList.GroupHeading>
+                </ActionList.Group>
+              </ActionList>
+            </FeatureFlags>,
+          ),
+        ).toThrow(/can not be used inside an ActionList with an ARIA role of "listbox"/)
+      })
     })
   })
 })
diff --git a/packages/react/src/ActionList/Heading.test.tsx b/packages/react/src/ActionList/Heading.test.tsx
index 316d4bad06d..6405d29f93e 100644
--- a/packages/react/src/ActionList/Heading.test.tsx
+++ b/packages/react/src/ActionList/Heading.test.tsx
@@ -3,7 +3,7 @@ import {render as HTMLRender} from '@testing-library/react'
 import BaseStyles from '../BaseStyles'
 import {ActionList} from '.'
 import {ActionMenu} from '..'
-import {implementsClassName} from '../utils/testing'
+import {implementsClassName, withExpectedConsoleError} from '../utils/testing'
 import classes from './Heading.module.css'
 
 describe('ActionList.Heading', () => {
@@ -42,22 +42,24 @@ describe('ActionList.Heading', () => {
   })
 
   it('should throw an error when ActionList.Heading is used within ActionMenu context', async () => {
-    expect(() =>
-      HTMLRender(
-        <BaseStyles>
-          <ActionMenu open={true}>
-            <ActionMenu.Button>Trigger</ActionMenu.Button>
-            <ActionMenu.Overlay>
-              <ActionList>
-                <ActionList.Heading as="h1">Heading</ActionList.Heading>
-                <ActionList.Item>Item</ActionList.Item>
-              </ActionList>
-            </ActionMenu.Overlay>
-          </ActionMenu>
-        </BaseStyles>,
-      ),
-    ).toThrow(
-      "ActionList.Heading shouldn't be used within an ActionMenu container. Menus are labelled by the menu button's name.",
-    )
+    withExpectedConsoleError(() => {
+      expect(() =>
+        HTMLRender(
+          <BaseStyles>
+            <ActionMenu open={true}>
+              <ActionMenu.Button>Trigger</ActionMenu.Button>
+              <ActionMenu.Overlay>
+                <ActionList>
+                  <ActionList.Heading as="h1">Heading</ActionList.Heading>
+                  <ActionList.Item>Item</ActionList.Item>
+                </ActionList>
+              </ActionMenu.Overlay>
+            </ActionMenu>
+          </BaseStyles>,
+        ),
+      ).toThrow(
+        "ActionList.Heading shouldn't be used within an ActionMenu container. Menus are labelled by the menu button's name.",
+      )
+    })
   })
 })
diff --git a/packages/react/src/TooltipV2/__tests__/Tooltip.test.tsx b/packages/react/src/TooltipV2/__tests__/Tooltip.test.tsx
index a2755af56f0..389b1127649 100644
--- a/packages/react/src/TooltipV2/__tests__/Tooltip.test.tsx
+++ b/packages/react/src/TooltipV2/__tests__/Tooltip.test.tsx
@@ -9,7 +9,7 @@ import {XIcon} from '@primer/octicons-react'
 import classes from '../Tooltip.module.css'
 
 import type {JSX} from 'react'
-import {implementsClassName} from '../../utils/testing'
+import {implementsClassName, withExpectedConsoleError} from '../../utils/testing'
 
 const TooltipComponent = (props: Omit<TooltipProps, 'text'> & {text?: string}) => (
   <Tooltip text="Tooltip text" {...props}>
@@ -125,15 +125,17 @@ describe('Tooltip', () => {
     expect(triggerEL.getAttribute('aria-describedby')).toContain('custom-tooltip-id')
   })
   it('should throw an error if the trigger element is disabled', () => {
-    expect(() => {
-      HTMLRender(
-        <Tooltip text="Tooltip text" direction="n">
-          <Button disabled>Delete</Button>
-        </Tooltip>,
+    withExpectedConsoleError(() => {
+      expect(() => {
+        HTMLRender(
+          <Tooltip text="Tooltip text" direction="n">
+            <Button disabled>Delete</Button>
+          </Tooltip>,
+        )
+      }).toThrow(
+        'The `Tooltip` component expects a single React element that contains interactive content. Consider using a `<button>` or equivalent interactive element instead.',
       )
-    }).toThrow(
-      'The `Tooltip` component expects a single React element that contains interactive content. Consider using a `<button>` or equivalent interactive element instead.',
-    )
+    })
   })
   it('should not throw an error when the trigger element is a button in a fieldset', () => {
     const {getByRole} = HTMLRender(
diff --git a/packages/react/src/UnderlineNav/UnderlineNav.test.tsx b/packages/react/src/UnderlineNav/UnderlineNav.test.tsx
index 6039ec2ad8a..1ab761f8e34 100644
--- a/packages/react/src/UnderlineNav/UnderlineNav.test.tsx
+++ b/packages/react/src/UnderlineNav/UnderlineNav.test.tsx
@@ -13,7 +13,7 @@ import {
 } from '@primer/octicons-react'
 
 import {UnderlineNav} from '.'
-import {implementsClassName} from '../utils/testing'
+import {implementsClassName, withExpectedConsoleError} from '../utils/testing'
 import classes from '../internal/components/UnderlineTabbedInterface.module.css'
 import {clsx} from 'clsx'
 
@@ -158,14 +158,16 @@ describe('UnderlineNav', () => {
   })
 
   it('throws an error when there are multiple items that have aria-current', () => {
-    expect(() => {
-      render(
-        <UnderlineNav aria-label="Test Navigation">
-          <UnderlineNav.Item aria-current="page">Item 1</UnderlineNav.Item>
-          <UnderlineNav.Item aria-current="page">Item 2</UnderlineNav.Item>
-        </UnderlineNav>,
-      )
-    }).toThrow('Only one current element is allowed')
+    withExpectedConsoleError(() => {
+      expect(() => {
+        render(
+          <UnderlineNav aria-label="Test Navigation">
+            <UnderlineNav.Item aria-current="page">Item 1</UnderlineNav.Item>
+            <UnderlineNav.Item aria-current="page">Item 2</UnderlineNav.Item>
+          </UnderlineNav>,
+        )
+      }).toThrow('Only one current element is allowed')
+    })
   })
 
   it('should support icons passed in as an element', () => {
@@ -242,7 +244,12 @@ describe('UnderlineNav', () => {
 
 describe('Keyboard Navigation', () => {
   it('should move focus to the next/previous item on the list with the tab key', async () => {
-    const {getByRole} = render(<ResponsiveUnderlineNav />)
+    const {getByRole} = render(
+      <UnderlineNav aria-label="Repository">
+        <UnderlineNav.Item aria-current="page">Code</UnderlineNav.Item>
+        <UnderlineNav.Item counter={120}>Issues</UnderlineNav.Item>
+      </UnderlineNav>,
+    )
     const item = getByRole('link', {name: 'Code'})
     const nextItem = getByRole('link', {name: 'Issues (120)'})
     const user = userEvent.setup()
diff --git a/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.test.tsx b/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.test.tsx
index 4ca371e2d30..e14683ed9c9 100644
--- a/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.test.tsx
+++ b/packages/react/src/experimental/UnderlinePanels/UnderlinePanels.test.tsx
@@ -7,7 +7,7 @@ import {describe, it, afterEach, beforeEach, expect, vi} from 'vitest'
 import {CodeIcon, EyeIcon} from '@primer/octicons-react'
 import UnderlinePanels from './UnderlinePanels'
 import TabContainerElement from '@github/tab-container-element'
-import {implementsClassName} from '../../utils/testing'
+import {implementsClassName, withExpectedConsoleError} from '../../utils/testing'
 import classes from './UnderlinePanels.module.css'
 
 TabContainerElement.prototype.selectTab = vi.fn()
@@ -107,46 +107,52 @@ describe('UnderlinePanels', () => {
   })
 
   it('throws an error when the number of tabs does not match the number of panels', () => {
-    expect(() => {
-      render(
-        <UnderlinePanels aria-label="Select a tab">
-          <UnderlinePanels.Tab>Tab 1</UnderlinePanels.Tab>
-          <UnderlinePanels.Tab>Tab 2</UnderlinePanels.Tab>
-          <UnderlinePanels.Panel>Panel 1</UnderlinePanels.Panel>
-          <UnderlinePanels.Panel>Panel 2</UnderlinePanels.Panel>
-          <UnderlinePanels.Panel>Panel 3</UnderlinePanels.Panel>
-        </UnderlinePanels>,
-      )
-    }).toThrow('The number of tabs and panels must be equal. Counted 2 tabs and 3 panels.')
+    withExpectedConsoleError(() => {
+      expect(() => {
+        render(
+          <UnderlinePanels aria-label="Select a tab">
+            <UnderlinePanels.Tab>Tab 1</UnderlinePanels.Tab>
+            <UnderlinePanels.Tab>Tab 2</UnderlinePanels.Tab>
+            <UnderlinePanels.Panel>Panel 1</UnderlinePanels.Panel>
+            <UnderlinePanels.Panel>Panel 2</UnderlinePanels.Panel>
+            <UnderlinePanels.Panel>Panel 3</UnderlinePanels.Panel>
+          </UnderlinePanels>,
+        )
+      }).toThrow('The number of tabs and panels must be equal. Counted 2 tabs and 3 panels.')
+    })
   })
 
   it('throws an error when the number of panels does not match the number of tabs', () => {
-    expect(() => {
-      render(
-        <UnderlinePanels aria-label="Select a tab">
-          <UnderlinePanels.Tab>Tab 1</UnderlinePanels.Tab>
-          <UnderlinePanels.Tab>Tab 2</UnderlinePanels.Tab>
-          <UnderlinePanels.Tab>Tab 3</UnderlinePanels.Tab>
-          <UnderlinePanels.Panel>Panel 1</UnderlinePanels.Panel>
-          <UnderlinePanels.Panel>Panel 2</UnderlinePanels.Panel>
-        </UnderlinePanels>,
-      )
-    }).toThrow('The number of tabs and panels must be equal. Counted 3 tabs and 2 panels.')
+    withExpectedConsoleError(() => {
+      expect(() => {
+        render(
+          <UnderlinePanels aria-label="Select a tab">
+            <UnderlinePanels.Tab>Tab 1</UnderlinePanels.Tab>
+            <UnderlinePanels.Tab>Tab 2</UnderlinePanels.Tab>
+            <UnderlinePanels.Tab>Tab 3</UnderlinePanels.Tab>
+            <UnderlinePanels.Panel>Panel 1</UnderlinePanels.Panel>
+            <UnderlinePanels.Panel>Panel 2</UnderlinePanels.Panel>
+          </UnderlinePanels>,
+        )
+      }).toThrow('The number of tabs and panels must be equal. Counted 3 tabs and 2 panels.')
+    })
   })
 
   it('throws an error when there are multiple items that have aria-selected', () => {
-    expect(() => {
-      render(
-        <UnderlinePanels aria-label="Select a tab">
-          <UnderlinePanels.Tab aria-selected={true}>Tab 1</UnderlinePanels.Tab>
-          <UnderlinePanels.Tab aria-selected={true}>Tab 2</UnderlinePanels.Tab>
-          <UnderlinePanels.Tab>Tab 3</UnderlinePanels.Tab>
-          <UnderlinePanels.Panel>Panel 1</UnderlinePanels.Panel>
-          <UnderlinePanels.Panel>Panel 2</UnderlinePanels.Panel>
-          <UnderlinePanels.Panel>Panel 3</UnderlinePanels.Panel>
-        </UnderlinePanels>,
-      )
-    }).toThrow('Only one tab can be selected at a time.')
+    withExpectedConsoleError(() => {
+      expect(() => {
+        render(
+          <UnderlinePanels aria-label="Select a tab">
+            <UnderlinePanels.Tab aria-selected={true}>Tab 1</UnderlinePanels.Tab>
+            <UnderlinePanels.Tab aria-selected={true}>Tab 2</UnderlinePanels.Tab>
+            <UnderlinePanels.Tab>Tab 3</UnderlinePanels.Tab>
+            <UnderlinePanels.Panel>Panel 1</UnderlinePanels.Panel>
+            <UnderlinePanels.Panel>Panel 2</UnderlinePanels.Panel>
+            <UnderlinePanels.Panel>Panel 3</UnderlinePanels.Panel>
+          </UnderlinePanels>,
+        )
+      }).toThrow('Only one tab can be selected at a time.')
+    })
   })
 })
 
diff --git a/packages/react/src/hooks/__tests__/useSlots.test.tsx b/packages/react/src/hooks/__tests__/useSlots.test.tsx
index d0a6b096af4..3b53c8fc4c5 100644
--- a/packages/react/src/hooks/__tests__/useSlots.test.tsx
+++ b/packages/react/src/hooks/__tests__/useSlots.test.tsx
@@ -2,6 +2,7 @@ import {render} from '@testing-library/react'
 import {expect, test, vi} from 'vitest'
 import type React from 'react'
 import {useSlots} from '../useSlots'
+import {withExpectedConsoleWarning} from '../../utils/testing'
 
 type TestComponentAProps = React.PropsWithChildren<{variant?: 'a' | 'b'}>
 
@@ -383,7 +384,9 @@ test('prefers direct component type match over slot symbol match', () => {
     return null
   }
 
-  render(<TestComponent>{children}</TestComponent>)
+  withExpectedConsoleWarning(() => {
+    render(<TestComponent>{children}</TestComponent>)
+  })
 
   expect(calls).toMatchInlineSnapshot(`
     [
@@ -421,7 +424,9 @@ test('handles components without slot symbols in mixed scenarios', () => {
     return null
   }
 
-  render(<TestComponent>{children}</TestComponent>)
+  withExpectedConsoleWarning(() => {
+    render(<TestComponent>{children}</TestComponent>)
+  })
 
   expect(calls).toMatchInlineSnapshot(`
     [
diff --git a/packages/react/src/utils/testing.tsx b/packages/react/src/utils/testing.tsx
index 3fdb2e0b5bd..0abe837a76c 100644
--- a/packages/react/src/utils/testing.tsx
+++ b/packages/react/src/utils/testing.tsx
@@ -1,5 +1,6 @@
 import {render as HTMLRender} from '@testing-library/react'
-import {it, expect} from 'vitest'
+import {it, expect, vi} from 'vitest'
+import {reactMajorVersion} from './environment'
 
 export function implementsClassName(Component: React.ElementType, baseClassName?: string) {
   it('renders with the custom className', () => {
@@ -16,3 +17,25 @@ export function implementsClassName(Component: React.ElementType, baseClassName?
     }
   })
 }
+
+export function withExpectedConsoleError(callback: () => void) {
+  const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {})
+  try {
+    callback()
+    if (reactMajorVersion < 19) {
+      expect(consoleSpy).toHaveBeenCalled()
+    }
+  } finally {
+    consoleSpy.mockRestore()
+  }
+}
+
+export function withExpectedConsoleWarning(callback: () => void) {
+  const consoleSpy = vi.spyOn(console, 'warn').mockImplementation(() => {})
+  try {
+    callback()
+    expect(consoleSpy).toHaveBeenCalled()
+  } finally {
+    consoleSpy.mockRestore()
+  }
+}