nstdlib-nightly/lib/internal/test_runner/reporter/dot.mjs

Node.js standard library converted to runtime-agnostic ES modules.

// Source: https://github.com/nodejs/node/blob/65eff1eb/lib/internal/test_runner/reporter/dot.js

import * as colors from "nstdlib/lib/internal/util/colors";
import { formatTestReport } from "nstdlib/lib/internal/test_runner/reporter/utils";

export default (async function* dot(source) {
  let count = 0;
  let columns = getLineLength();
  const failedTests = [];
  for await (const { type, data } of source) {
    if (type === "test:pass") {
      yield `${colors.green}.${colors.clear}`;
    }
    if (type === "test:fail") {
      yield `${colors.red}X${colors.clear}`;
      Array.prototype.push.call(failedTests, data);
    }
    if ((type === "test:fail" || type === "test:pass") && ++count === columns) {
      yield "\n";

      // Getting again in case the terminal was resized.
      columns = getLineLength();
      count = 0;
    }
  }
  yield "\n";
  if (failedTests.length > 0) {
    yield `\n${colors.red}Failed tests:${colors.white}\n\n`;
    for (const test of failedTests) {
      yield formatTestReport("test:fail", test);
    }
  }
});

function getLineLength() {
  return Math.max(process.stdout.columns ?? 20, 20);
}