CODEWITHSUNDEEP
unit-testingdart
Freewind
Freewind

Reputation: 198198

How to test a function which throws exception, in Dart?

Say I have a function which throws exception:

hello() {
    throw "exception of world";
}

I want to test it, so I write a test:

test("function hello should throw exception", () {
    expect(()=>hello(), throwsA("exception of world"));
});

You can see I didn't call hello() directly, instead, I use ()=>hello().

It works but I wonder if is there any other way to write tests for it?

Upvotes: 5

Views: 2808

Answers (2)

Günter Zöchbauer
Günter Zöchbauer

Reputation: 657168

This article explains how to test exceptions https://github.com/dart-lang/test/blob/master/pkgs/test/README.md#asynchronous-tests

test("function hello should throw exception", () {
    expect(hello, throwsA(quals("exception of world")));
});

Upvotes: 4

Ganymede
Ganymede

Reputation: 3655

You can pass hello directly by name instead of creating a closure that only calls hello.

This unit-test passes:

main() {
  test("function hello should throw exception", () {
      expect(hello, throwsA(new isInstanceOf<String>()));
  });
}

Upvotes: 6

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