assert: fix EOL issue in messages on Windows

PR-URL: https://github.com/nodejs/node/pull/20754
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

lib/assert.js

@@ -120,12 +120,12 @@ assert.fail = fail;
 assert.AssertionError = AssertionError;
 
 function getBuffer(fd, assertLine) {
-  var lines = 0;
+  let lines = 0;
   // Prevent blocking the event loop by limiting the maximum amount of
   // data that may be read.
-  var maxReads = 64; // bytesPerRead * maxReads = 512 kb
+  let maxReads = 64; // bytesPerRead * maxReads = 512 kb
-  var bytesRead = 0;
+  let bytesRead = 0;
-  var startBuffer = 0; // Start reading from that char on
+  let startBuffer = 0; // Start reading from that char on
   const bytesPerRead = 8192;
   const buffers = [];
   do {
@@ -168,7 +168,7 @@ function getErrMessage(call) {
     return;
   }
 
-  var fd;
+  let fd, message;
   try {
     fd = openSync(filename, 'r', 0o666);
     const buffers = getBuffer(fd, line);
@@ -187,11 +187,14 @@ function getErrMessage(call) {
     // not user defined function names.
       const ok = name === 'ok' ? '.ok' : '';
       const args = node.arguments;
-      var message = code
+      message = code
         .slice(args[0].start, args[args.length - 1].end)
         .replace(escapeSequencesRegExp, escapeFn);
+      if (EOL === '\r\n') {
+        message = message.replace(/\r\n/g, '\n');
+      }
       message = 'The expression evaluated to a falsy value:' +
-        `${EOL}${EOL}  assert${ok}(${message})${EOL}`;
+        `\n\n  assert${ok}(${message})\n`;
     }
     // Make sure to always set the cache! No matter if the message is
     // undefined or not

test/parallel/test-assert.js

@@ -27,7 +27,6 @@
 
 const common = require('../common');
 const assert = require('assert');
-const { EOL } = require('os');
 const EventEmitter = require('events');
 const { errorCache } = require('internal/assert');
 const { writeFileSync, unlinkSync } = require('fs');
@@ -462,8 +461,8 @@ assert.throws(
     {
       code: 'ERR_ASSERTION',
       type: assert.AssertionError,
-      message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
+      message: 'The expression evaluated to a falsy value:\n\n  ' +
-               `assert.ok(typeof 123 === 'string')${EOL}`
+               "assert.ok(typeof 123 === 'string')\n"
     }
   );
   Error.stackTraceLimit = tmpLimit;
@@ -625,8 +624,8 @@ common.expectsError(
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
     generatedMessage: true,
-    message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
+    message: 'The expression evaluated to a falsy value:\n\n  ' +
-             `assert.ok(null)${EOL}`
+             'assert.ok(null)\n'
   }
 );
 common.expectsError(
@@ -635,8 +634,8 @@ common.expectsError(
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
     generatedMessage: true,
-    message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
+    message: 'The expression evaluated to a falsy value:\n\n  ' +
-             `assert(typeof 123 === 'string')${EOL}`
+             "assert(typeof 123 === 'string')\n"
   }
 );
 
@@ -666,8 +665,8 @@ common.expectsError(
     {
       code: 'ERR_ASSERTION',
       type: assert.AssertionError,
-      message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
+      message: 'The expression evaluated to a falsy value:\n\n  ' +
-               `assert(Buffer.from('test') instanceof Error)${EOL}`
+               "assert(Buffer.from('test') instanceof Error)\n"
     }
   );
   common.expectsError(
@@ -675,8 +674,8 @@ common.expectsError(
     {
       code: 'ERR_ASSERTION',
       type: assert.AssertionError,
-      message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
+      message: 'The expression evaluated to a falsy value:\n\n  ' +
-               `assert(Buffer.from('test') instanceof Error)${EOL}`
+               "assert(Buffer.from('test') instanceof Error)\n"
     }
   );
   fs.close = tmp;
@@ -695,12 +694,12 @@ common.expectsError(
   {
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
-    message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
+    message: 'The expression evaluated to a falsy value:\n\n  ' +
-             `assert((() => 'string')()${EOL}` +
+             "assert((() => 'string')()\n" +
-             `      // eslint-disable-next-line${EOL}` +
+             '      // eslint-disable-next-line\n' +
-             `      ===${EOL}` +
+             '      ===\n' +
-             `      123 instanceof${EOL}` +
+             '      123 instanceof\n' +
-             `          Buffer)${EOL}`
+             '          Buffer)\n'
   }
 );
 
@@ -709,8 +708,8 @@ common.expectsError(
   {
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
-    message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
+    message: 'The expression evaluated to a falsy value:\n\n  ' +
-             `assert(null, undefined)${EOL}`
+             'assert(null, undefined)\n'
   }
 );