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30 lines
969 B
TypeScript
30 lines
969 B
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// This module is browser compatible.
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import { format } from "@std/internal/format";
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import { AssertionError } from "./assertion_error.ts";
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/**
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* Make an assertion that `actual` is less than `expected`.
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* If not then throw.
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*
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* @example Usage
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* ```ts no-eval
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* import { assertLess } from "@std/assert/assert-less";
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*
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* assertLess(1, 2); // Doesn't throw
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* assertLess(2, 1); // Throws
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* ```
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*
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* @typeParam T The type of the values to compare.
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* @param actual The actual value to compare.
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* @param expected The expected value to compare.
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* @param msg The optional message to display if the assertion fails.
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*/
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export function assertLess<T>(actual: T, expected: T, msg?: string) {
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if (actual < expected) return;
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const actualString = format(actual);
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const expectedString = format(expected);
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throw new AssertionError(msg ?? `Expect ${actualString} < ${expectedString}`);
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}
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