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assert_almost_equals_test.ts
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assert_almost_equals_test.ts
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertAlmostEquals, AssertionError, assertThrows } from "./mod.ts";
Deno.test("assert almost equals number", () => {
//Default precision
assertAlmostEquals(-0, +0);
assertAlmostEquals(Math.PI, Math.PI);
assertAlmostEquals(0.1 + 0.2, 0.3);
assertAlmostEquals(NaN, NaN);
assertAlmostEquals(Number.NaN, Number.NaN);
assertThrows(() => assertAlmostEquals(1, 2));
assertThrows(() => assertAlmostEquals(1, 1.1));
//Higher precision
assertAlmostEquals(0.1 + 0.2, 0.3, 1e-16);
assertThrows(
() => assertAlmostEquals(0.1 + 0.2, 0.3, 1e-17),
AssertionError,
`Expected actual: "${
(
0.1 + 0.2
).toExponential()
}" to be close to "${(0.3).toExponential()}"`,
);
//Special cases
assertAlmostEquals(Infinity, Infinity);
assertThrows(
() => assertAlmostEquals(0, Infinity),
AssertionError,
'Expected actual: "0" to be close to "Infinity"',
);
assertThrows(
() => assertAlmostEquals(-Infinity, +Infinity),
AssertionError,
'Expected actual: "-Infinity" to be close to "Infinity"',
);
assertThrows(
() => assertAlmostEquals(Infinity, NaN),
AssertionError,
'Expected actual: "Infinity" to be close to "NaN"',
);
});