chore(ses): create unit tests for drop spam handler

[colifran]

This PR adds unit tests for the SES drop spam handler. Specifically, the unit tests verify that spam will be dropped under the following conditions:

1. SPF verdict is FAIL
2. DKIM verdict is FAIL
3. Spam verdict is FAIL
4. Virus verdict is FAIL

An additional unit test was added to ensure that null is returned if all the above verdicts are not FAIL.

Closes #27726

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[MrArnoldPalmer]

approved with DNM just for my little refactor if you want it, not a hard requirement.

[MrArnoldPalmer]

Suggested change

	test('drop spam when spf verdict status is FAIL', async () => {
	const sesEvent = createSesEvent({ spf: { status: 'FAIL' } });
	const response = await handler(sesEvent);
	expect(response).toEqual({ disposition: 'STOP_RULE_SET' });
	});
	test('drop spam when dkim verdict status is FAIL', async () => {
	const sesEvent = createSesEvent({ dkim: { status: 'FAIL' } });
	const response = await handler(sesEvent);
	expect(response).toEqual({ disposition: 'STOP_RULE_SET' });
	});
	test('drop spam when spam verdict status is FAIL', async () => {
	const sesEvent = createSesEvent({ spam: { status: 'FAIL' } });
	const response = await handler(sesEvent);
	expect(response).toEqual({ disposition: 'STOP_RULE_SET' });
	});
	test('drop spam when virus verdict status is FAIL', async () => {
	const sesEvent = createSesEvent({ virus: { status: 'FAIL' } });
	const response = await handler(sesEvent);
	expect(response).toEqual({ disposition: 'STOP_RULE_SET' });
	});
	test.each([ 'spf', 'dkim', 'spam', 'virus'])('drop spam when %s status is FAIL', (key) => {
	const sesEvent = createSesEvent({ [key]: { status: 'FAIL' } });
	const response = await handler(sesEvent);
	expect(response).toEqual({ disposition: 'STOP_RULE_SET' });
	});

Just nitpicking

[colifran]

Good suggestion. Updated.

[aws-cdk-automation]

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[mergify]

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