Function assertDiffMessage

assert/unstable_equals_test.ts:10–29

(a: unknown, b: unknown, expected: string)

import { disposableStack } from "../internal/_testing.ts";

function assertDiffMessage(a: unknown, b: unknown, expected: string) {
  const err = assertThrows(() => assertEquals(a, b), AssertionError);
  // TODO(lionel-rowe): re-spell `fullExpectedMessage` indentation once https://github.com/denoland/std/issues/6830
  // is fixed
  const fullExpectedMessage = dedent`
        Values are not equal.


            [Diff] Actual / Expected


        ${expected}
  `;
  assertEquals(
    // TODO(lionel-rowe): compare full messages without trimming once https://github.com/denoland/std/issues/6830 and
    // https://github.com/denoland/std/issues/6831 are fixed
    stripAnsiCode(err.message).trimEnd(),
    fullExpectedMessage,
  );
}

Deno.test(`assertEquals() truncates unchanged lines of large diffs when "${DIFF_CONTEXT_LENGTH}" is set`, async (t) => {
  using stack = disposableStack();