unittest: "in" Matcher #137
Description
<img src="https://avatars.githubusercontent.com/u/444270?v=3" align="left" width="96" height="96"hspace="10"> Issue by seaneagan
Originally opened as dart-lang/sdk#3679
I think an inverse of the "contains" Matcher would be even more useful, since the Collection/Map/String is more likely the pattern you want to match against. Could call it "in":
Matcher in(container);
//e.g.
expect(x, in([1, 2, 3]));
expect(k, in({"x": 1, "y": 2, "z": 3}));
expect(s, in("xyz"));