Function getCoverageReport

lib/internal/test_runner/utils.js:560–705

(pad, summary, symbol, color, table)

}

function getCoverageReport(pad, summary, symbol, color, table) {
  const prefix = `${pad}${symbol}`;
  let report = `${color}${prefix}start of coverage report\n`;

  let filePadLength;
  let columnPadLengths = [];
  let uncoveredLinesPadLength;
  let tableWidth;

  // Create a tree of file paths
  const { tree, treeDepth, longestFile } = buildFileTree(summary);
  if (table) {
    // Calculate expected column sizes based on the tree
    filePadLength = table && longestFile;
    filePadLength += (treeDepth - 1);
    if (color) {
      filePadLength += 2;
    }
    filePadLength = MathMax(filePadLength, 'all files'.length);
    if (filePadLength > (process.stdout.columns / 2)) {
      filePadLength = MathFloor(process.stdout.columns / 2);
    }
    const fileWidth = filePadLength + 2;

    columnPadLengths = ArrayPrototypeMap(kColumns, (column) => (table ? MathMax(column.length, 6) : 0));
    const columnsWidth = ArrayPrototypeReduce(columnPadLengths, (acc, columnPadLength) => acc + columnPadLength + 3, 0);

    uncoveredLinesPadLength = table && ArrayPrototypeReduce(summary.files, (acc, file) =>
      MathMax(acc, formatUncoveredLines(getUncoveredLines(file.lines), table).length), 0);
    uncoveredLinesPadLength = MathMax(uncoveredLinesPadLength, 'uncovered lines'.length);
    const uncoveredLinesWidth = uncoveredLinesPadLength + 2;

    tableWidth = fileWidth + columnsWidth + uncoveredLinesWidth;

    const availableWidth = (process.stdout.columns || Infinity) - prefix.length;
    const columnsExtras = tableWidth - availableWidth;
    if (table && columnsExtras > 0) {
      filePadLength = MathMin(availableWidth * 0.5, filePadLength);
      uncoveredLinesPadLength = MathMax(availableWidth - columnsWidth - (filePadLength + 2) - 2, 1);
      tableWidth = availableWidth;
    } else {
      uncoveredLinesPadLength = Infinity;
    }
  }

  function getCell(string, width, pad, truncate, coverage) {
    if (!table) return string;

    let result = string;
    if (pad) result = pad(result, width);
    if (truncate) result = truncate(result, width);
    if (color && coverage !== undefined) {
      if (coverage > 90) return `${coverageColors.high}${result}${color}`;
      if (coverage > 50) return `${coverageColors.medium}${result}${color}`;
      return `${coverageColors.low}${result}${color}`;
    }
    return result;
  }