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assert_throws_test.ts
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assert_throws_test.ts
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import {
assert,
assertEquals,
AssertionError,
assertThrows,
fail,
} from "./mod.ts";
Deno.test("assertThrows with wrong error class", () => {
assertThrows(
() => {
//This next assertThrows will throw an AssertionError due to the wrong
//expected error class
assertThrows(
() => {
fail("foo");
},
TypeError,
"Failed assertion: foo",
);
},
AssertionError,
`Expected error to be instance of "TypeError", but was "AssertionError"`,
);
});
Deno.test("assertThrows with return type", () => {
assertThrows(() => {
throw new Error();
});
});
Deno.test("assertThrows with non-error value thrown and error class", () => {
assertThrows(
() => {
assertThrows(
() => {
throw "Panic!";
},
Error,
"Panic!",
);
},
AssertionError,
"A non-Error object was thrown.",
);
});
Deno.test("assertThrows with non-error value thrown", () => {
assertThrows(
() => {
throw "Panic!";
},
);
assertThrows(
() => {
throw null;
},
);
assertThrows(
() => {
throw undefined;
},
);
});
Deno.test("assertThrows with error class", () => {
assertThrows(
() => {
throw new Error("foo");
},
Error,
"foo",
);
});
Deno.test("assertThrows with thrown error returns caught error", () => {
const error = assertThrows(
() => {
throw new Error("foo");
},
);
assert(error instanceof Error);
assertEquals(error.message, "foo");
});
Deno.test("assertThrows with thrown non-error returns caught error", () => {
const stringError = assertThrows(
() => {
throw "Panic!";
},
);
assert(typeof stringError === "string");
assertEquals(stringError, "Panic!");
const numberError = assertThrows(
() => {
throw 1;
},
);
assert(typeof numberError === "number");
assertEquals(numberError, 1);
const nullError = assertThrows(
() => {
throw null;
},
);
assert(nullError === null);
const undefinedError = assertThrows(
() => {
throw undefined;
},
);
assert(typeof undefinedError === "undefined");
assertEquals(undefinedError, undefined);
});
Deno.test("Assert Throws Parent Error", () => {
assertThrows(
() => {
throw new AssertionError("Fail!");
},
Error,
"Fail!",
);
});