expect-toMatchSnapshot-2.js

expect.extend({
  toMatchSnapshot(ctx) {
    if (!ctx || !ctx.test) {
      throw new Error(
        dedent(`missing \`ctx\` parameter for .toMatchSnapshot(),
          did you forget to pass \`this\` expect().toMatchSnapshot(this)?`),
      );
    }

    const { test } = ctx;

    // would contain the full path to test file
    const testFile = test.file;
    const testTitle = makeTestTitle(test);

    const result = toMatchSnapshot(this.actual, testFile, testTitle);

    expect.assert(result.pass, !result.pass ? result.report() : '');

    return this;
  }
});