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 \$5 + 10 CHF = \$10 if rate is 2:1

It's a new day, and our to-do list has become a bit cluttered, so we'll copy the pending items to a fresh list. (I like physically copying to-do items to a new list. If there are lots of little items, I tend just to take care of them rather than copy them. Little stuff that otherwise might build up gets taken care of just because I'm lazy. Play to your strengths.)

 \$5 + 10 CHF = \$10 if rate is 2:1\$5 + \$5 = \$10

I'm not sure how to write the story of the whole addition, so we'll start with a simpler example: \$5 + \$5 = \$10.

```public void testSimpleAddition() {
Money sum= Money.dollar(5).plus(Money.dollar(5));
assertEquals(Money.dollar(10), sum);
}
```

We could fake the ...

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