assert: make skipping indicator blue

If lines gets skipped, they are marked with three dots. This makes sure they are better visualized to distinguish them from everything else. PR-URL: #20315 Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>

Author: BridgeAR

lib/internal/errors.js

@@ -15,6 +15,7 @@ const kInfo = Symbol('info');
 const messages = new Map();
 const codes = {};
 
+let blue = '';
 let green = '';
 let red = '';
 let white = '';
@@ -259,7 +260,7 @@ function createErrDiff(actual, expected, operator) {
  const expectedLines = inspectValue(expected);
  const msg = READABLE_OPERATOR[operator] +
  `:\n${green}+ expected${white} ${red}- actual${white}`;
- const skippedMsg = ' ... Lines skipped';
+ const skippedMsg = ` ${blue}...${white} Lines skipped`;
 
  // Remove all ending lines that match (this optimizes the output for
  // readability by reducing the number of total changed lines).
@@ -280,7 +281,7 @@ function createErrDiff(actual, expected, operator) {
  b = expectedLines[expectedLines.length - 1];
  }
  if (i > 3) {
- end = `\n...${end}`;
+ end = `\n${blue}...${white}${end}`;
  skipped = true;
  }
  if (other !== '') {
@@ -297,7 +298,7 @@ function createErrDiff(actual, expected, operator) {
  if (actualLines.length < i + 1) {
  if (cur > 1 && i > 2) {
  if (cur > 4) {
- res += '\n...';
+ res += `\n${blue}...${white}`;
  skipped = true;
  } else if (cur > 3) {
  res += `\n ${expectedLines[i - 2]}`;
@@ -313,7 +314,7 @@ function createErrDiff(actual, expected, operator) {
  } else if (expectedLines.length < i + 1) {
  if (cur > 1 && i > 2) {
  if (cur > 4) {
- res += '\n...';
+ res += `\n${blue}...${white}`;
  skipped = true;
  } else if (cur > 3) {
  res += `\n ${actualLines[i - 2]}`;
@@ -329,7 +330,7 @@ function createErrDiff(actual, expected, operator) {
  } else if (actualLines[i] !== expectedLines[i]) {
  if (cur > 1 && i > 2) {
  if (cur > 4) {
- res += '\n...';
+ res += `\n${blue}...${white}`;
  skipped = true;
  } else if (cur > 3) {
  res += `\n ${actualLines[i - 2]}`;
@@ -354,7 +355,8 @@ function createErrDiff(actual, expected, operator) {
  }
  // Inspected object to big (Show ~20 rows max)
  if (printedLines > 20 && i < maxLines - 2) {
- return `${msg}${skippedMsg}\n${res}\n...${other}\n...`;
+ return `${msg}${skippedMsg}\n${res}\n${blue}...${white}${other}\n` +
+ `${blue}...${white}`;
  }
  }
 
@@ -371,7 +373,7 @@ function createErrDiff(actual, expected, operator) {
  // Only remove lines in case it makes sense to collapse those.
  // TODO: Accept env to always show the full error.
  if (actualLines.length > 30) {
- actualLines[26] = '...';
+ actualLines[26] = `${blue}...${white}`;
  while (actualLines.length > 27) {
  actualLines.pop();
  }
@@ -402,10 +404,12 @@ class AssertionError extends Error {
  // Reset on each call to make sure we handle dynamically set environment
  // variables correct.
  if (process.stdout.getColorDepth() !== 1) {
+ blue = '\u001b[34m';
  green = '\u001b[32m';
  white = '\u001b[39m';
  red = '\u001b[31m';
  } else {
+ blue = '';
  green = '';
  white = '';
  red = '';
@@ -435,7 +439,7 @@ class AssertionError extends Error {
  // Only remove lines in case it makes sense to collapse those.
  // TODO: Accept env to always show the full error.
  if (res.length > 30) {
- res[26] = '...';
+ res[26] = `${blue}...${white}`;
  while (res.length > 27) {
  res.pop();
  }

test/pseudo-tty/test-assert-colors.js

@@ -5,13 +5,16 @@ const assert = require('assert').strict;
 try {
  // Activate colors even if the tty does not support colors.
  process.env.COLORTERM = '1';
- assert.deepStrictEqual([1, 2], [2, 2]);
+ assert.deepStrictEqual([1, 2, 2, 2], [2, 2, 2, 2]);
 } catch (err) {
  const expected = 'Input A expected to strictly deep-equal input B:\n' +
- '\u001b[32m+ expected\u001b[39m \u001b[31m- actual\u001b[39m\n\n' +
+ '\u001b[32m+ expected\u001b[39m \u001b[31m- actual\u001b[39m' +
+ ' \u001b[34m...\u001b[39m Lines skipped\n\n' +
  ' [\n' +
  '\u001b[31m-\u001b[39m 1,\n' +
  '\u001b[32m+\u001b[39m 2,\n' +
+ ' 2,\n' +
+ '\u001b[34m...\u001b[39m\n' +
  ' 2\n' +
  ' ]';
  assert.strictEqual(err.message, expected);