Updated the test

app/src/organisms/Devices/RobotSettings/AdvancedTab/AdvancedTabSlideouts/RenameRobotSlideout.tsx

@@ -33,7 +33,7 @@ interface FormikErrors {
    allow users to use alphabets(a-z & A-Z) and numbers
    https://github.com/Opentrons/opentrons/issues/10214
 */
-const REGEX_RENAME_ROBOT_PATTERN = /([a-zA-Z0-9]{0,35})/
+const REGEX_RENAME_ROBOT_PATTERN = /^([a-zA-Z0-9]{0,35})$/
 const regexPattern = new RegExp(REGEX_RENAME_ROBOT_PATTERN)
 
 export function RenameRobotSlideout({

app/src/organisms/Devices/RobotSettings/AdvancedTab/AdvancedTabSlideouts/__tests__/RenameRobotSlideout.test.tsx

@@ -73,9 +73,26 @@ describe('RobotSettings RenameRobotSlideout', () => {
     const [{ getByRole, findByText }] = render()
     const input = getByRole('textbox')
     fireEvent.change(input, {
-      target: { value: 'This is more than 35 characters This is a mock' },
+      target: { value: 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' },
     })
-    expect(input).toHaveValue('This is more than 35 characters This is a mock')
+    expect(input).toHaveValue('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
+    const renameButton = getByRole('button', { name: 'Rename robot' })
+    const error = await findByText(
+      'Please enter 35 characters max using valid inputs: letters and numbers'
+    )
+    await waitFor(() => {
+      expect(renameButton).toBeDisabled()
+      expect(error).toBeInTheDocument()
+    })
+  })
+
+  it('button should be disabled and render the error message when a user tries to use space', async () => {
+    const [{ getByRole, findByText }] = render()
+    const input = getByRole('textbox')
+    fireEvent.change(input, {
+      target: { value: 'Hello world123' },
+    })
+    expect(input).toHaveValue('Hello world123')
     const renameButton = getByRole('button', { name: 'Rename robot' })
     const error = await findByText(
       'Please enter 35 characters max using valid inputs: letters and numbers'