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assert_not_equals.ts
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assert_not_equals.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { CAN_NOT_DISPLAY } from "./_constants.ts";
import { equal } from "./equal.ts";
import { AssertionError } from "./assertion_error.ts";
/**
* Make an assertion that `actual` and `expected` are not equal, deeply.
* If not then throw.
*
* Type parameter can be specified to ensure values under comparison have the same type.
*
* @example
* ```ts
* import { assertNotEquals } from "https://deno.land/std@$STD_VERSION/assert/assert_not_equals.ts";
*
* assertNotEquals(1, 2); // Doesn't throw
* assertNotEquals(1, 1); // Throws
* ```
*/
export function assertNotEquals<T>(actual: T, expected: T, msg?: string) {
if (!equal(actual, expected)) {
return;
}
let actualString: string;
let expectedString: string;
try {
actualString = String(actual);
} catch {
actualString = CAN_NOT_DISPLAY;
}
try {
expectedString = String(expected);
} catch {
expectedString = CAN_NOT_DISPLAY;
}
const msgSuffix = msg ? `: ${msg}` : ".";
throw new AssertionError(
`Expected actual: ${actualString} not to be: ${expectedString}${msgSuffix}`,
);
}