From e0d0b19c30b13dfb85ccfc5774a6cf01e9e0f68f Mon Sep 17 00:00:00 2001
From: Raz Luvaton <16746759+rluvaton@users.noreply.github.com>
Date: Tue, 23 May 2023 07:44:38 +0300
Subject: [PATCH] test_runner: display dot report as wide as the terminal width

PR-URL: https://github.com/nodejs/node/pull/48038
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
---
 lib/internal/test_runner/reporter/dot.js       | 12 +++++++++++-
 .../output/dot_output_custom_columns.js        | 18 ++++++++++++++++++
 .../output/dot_output_custom_columns.snapshot  |  3 +++
 test/parallel/test-runner-output.mjs           |  1 +
 4 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 test/fixtures/test-runner/output/dot_output_custom_columns.js
 create mode 100644 test/fixtures/test-runner/output/dot_output_custom_columns.snapshot

diff --git a/lib/internal/test_runner/reporter/dot.js b/lib/internal/test_runner/reporter/dot.js
index 7dbba5a957894e..496c819d69ea07 100644
--- a/lib/internal/test_runner/reporter/dot.js
+++ b/lib/internal/test_runner/reporter/dot.js
@@ -1,7 +1,9 @@
 'use strict';
+const { MathMax } = primordials;
 
 module.exports = async function* dot(source) {
   let count = 0;
+  let columns = getLineLength();
   for await (const { type } of source) {
     if (type === 'test:pass') {
       yield '.';
@@ -9,9 +11,17 @@ module.exports = async function* dot(source) {
     if (type === 'test:fail') {
       yield 'X';
     }
-    if ((type === 'test:fail' || type === 'test:pass') && ++count % 20 === 0) {
+    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';
 };
+
+function getLineLength() {
+  return MathMax(process.stdout.columns ?? 20, 20);
+}
diff --git a/test/fixtures/test-runner/output/dot_output_custom_columns.js b/test/fixtures/test-runner/output/dot_output_custom_columns.js
new file mode 100644
index 00000000000000..875ead9efc22a5
--- /dev/null
+++ b/test/fixtures/test-runner/output/dot_output_custom_columns.js
@@ -0,0 +1,18 @@
+// Flags: --test-reporter=dot
+'use strict';
+process.stdout.columns = 30;
+
+const test = require('node:test');
+const { setTimeout } = require('timers/promises');
+
+for (let i = 0; i < 100; i++) {
+  test(i + ' example', async () => {
+    if (i === 0) {
+      // So the reporter will run before all tests has started
+      await setTimeout(10);
+    }
+    // resize
+    if (i === 28)
+      process.stdout.columns = 41;
+  });
+}
diff --git a/test/fixtures/test-runner/output/dot_output_custom_columns.snapshot b/test/fixtures/test-runner/output/dot_output_custom_columns.snapshot
new file mode 100644
index 00000000000000..1aaaf3eb243ae4
--- /dev/null
+++ b/test/fixtures/test-runner/output/dot_output_custom_columns.snapshot
@@ -0,0 +1,3 @@
+..............................
+.........................................
+.............................
diff --git a/test/parallel/test-runner-output.mjs b/test/parallel/test-runner-output.mjs
index d2fa06b4395095..bd8c9f1bd071ee 100644
--- a/test/parallel/test-runner-output.mjs
+++ b/test/parallel/test-runner-output.mjs
@@ -46,6 +46,7 @@ const tests = [
   { name: 'test-runner/output/unresolved_promise.js' },
   { name: 'test-runner/output/default_output.js', transform: specTransform, tty: true },
   { name: 'test-runner/output/arbitrary-output.js' },
+  { name: 'test-runner/output/dot_output_custom_columns.js', transform: specTransform, tty: true },
 ].map(({ name, tty, transform }) => ({
   name,
   fn: common.mustCall(async () => {