countingSundays(1943, 1946)
应该返回6。'
testString: assert.strictEqual(countingSundays(1943, 1946), 6);
- text: 'countingSundays(1995, 2000)
应该返回9。'
testString: assert.strictEqual(countingSundays(1995, 2000), 10);
- text: 'countingSundays(1901, 2000)
应该返回171。'
testString: assert.strictEqual(countingSundays(1901, 2000), 171);
```