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To remind yourself to write a test later, use the test.todo function. There’s no need to provide a test implementation.
/icons/typescript.svgtest.ts
import {test, expect} from 'bun:test';

// write this later
test.todo('unimplemented feature');
The output of bun test indicates how many todo tests were encountered.
terminal
bun test

test.test.ts:
✓ add [0.03ms]
✓ multiply [0.02ms]
✎ unimplemented feature

 2 pass
 1 todo
 0 fail
 2 expect() calls
Ran 3 tests across 1 files. [74.00ms]
Optionally, you can provide a test implementation. 
import {test, expect} from 'bun:test';

test.todo('unimplemented feature', () => {
	expect(Bun.isAwesome()).toBe(true);
});
If an implementation is provided, it will not be run unless the --todo flag is passed. If the --todo flag is passed, the test will be executed and expected to fail by test runner! If a todo test passes, the bun test run will return a non-zero exit code to signal the failure.
terminal
bun test --todo

my.test.ts:
✗ unimplemented feature
  ^ this test is marked as todo but passes. Remove `.todo` or check that test is correct.

 0 pass
 1 fail
 1 expect() calls
$ echo $?
1 # this is the exit code of the previous command
See also:
⌘I