Use package:stack_trace in unittest.

sdk/lib/_internal/pub/test/command_line_config.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library command_line_config;
 
 import 'dart:io';
 import 'dart:math' as math;
 
 import 'package:pathos/path.dart' as path;
@@ skipping 23 matching lines @@
       case PASS: result = '$_green$_checkbox$_none'; break;
       case FAIL: result = '$_red$_ballotX$_none'; break;
       case ERROR: result = '$_magenta?$_none'; break;
     }
     print('$result ${testCase.description}');
 
     if (testCase.message != '') {
       print(_indent(testCase.message));
     }
 
-    _printStackTrace(testCase.stackTrace);
+    if (testCase.stackTrace != null) {
+      print(_indent(testCase.stackTrace.toString()));
+    }
 
     super.onTestResult(testCase);
   }
 
   void onSummary(int passed, int failed, int errors, List<TestCase> results,
       String uncaughtError) {
     var success = false;
     if (uncaughtError != null) {
       print('Top-level uncaught error: $uncaughtError');
     } else if (errors != 0) {
       print('${_green}$passed${_none} passed, ${_red}$failed${_none} failed, '
             '${_magenta}$errors${_none} errors.');
     } else if (failed != 0) {
       print('${_green}$passed${_none} passed, ${_red}$failed${_none} '
             'failed.');
     } else if (passed == 0) {
       print('No tests found.');
     } else {
       print('All ${_green}$passed${_none} tests passed!');
       success = true;
     }
   }
 
   void onDone(bool success) {
     if (!success) exit(1);
   }
-
-  void _printStackTrace(String stackTrace) {
-    if (stackTrace == null || stackTrace == '') return;
-
-    print('');
-
-    // Parse out each stack entry.
-    var stack = [];
-    for (var line in stackTrace.split('\n')) {
-      if (line.trim() == '') continue;
-      stack.add(new _StackFrame(line));
-    }
-
-    if (stack.length == 0) return;
-
-    // Figure out the longest path so we know how much to pad.
-    int longest = stack.map((frame) => frame.location.length).reduce(math.max);
-
-    // Print out the stack trace nicely formatted.
-    for (var frame in stack) {
-      print('  ${_padLeft(frame.location, longest)}  ${frame.member}');
-    }
-
-    print('');
-  }
-
-  String _padLeft(String string, int length) {
-    if (string.length >= length) return string;
-
-    var result = new StringBuffer();
-    result.write(string);
-    for (var i = 0; i < length - string.length; i++) {
-      result.write(' ');
-    }
-
-    return result.toString();
-  }
-
-  String _indent(String str) =>
-    str.replaceAll(new RegExp("^", multiLine: true), "  ");
 }
-
-class _StackFrame {
-  static final fileRegExp = new RegExp(
-      r'#\d+\s+(.*) \(file://(/.+):(\d+):(\d+)\)');
-  static final coreRegExp = new RegExp(r'#\d+\s+(.*) \((.+):(\d+):(\d+)\)');
-
-  /// If `true`, then this stack frame is for a library built into Dart and
-  /// not a regular file path.
-  final bool isCore;
-
-  /// The path to the library or the library name if a core library.
-  String library;
-
-  /// The line number.
-  final String line;
-
-  /// The column number.
-  final String column;
-
-  /// The member where the error occurred.
-  final String member;
-
-  /// A formatted description of the code location.
-  String get location => '$library $line:$column';
-
-  _StackFrame._(this.isCore, this.library, this.line, this.column, this.member);
-
-  factory _StackFrame(String text) {
-    var match = fileRegExp.firstMatch(text);
-    var isCore = false;
-
-    if (match == null) {
-      match = coreRegExp.firstMatch(text);
-      if (match == null) {
-        throw new FormatException("Couldn't parse stack trace line '$text'.");
-      }
-      isCore = true;
-    }
-
-    var library = match[2];
-    if (!isCore) {
-      // Make the library path relative to the entrypoint.
-      library = path.relative(library);
-    }
-
-    var member = match[1].replaceAll("<anonymous closure>", _lambda);
-    return new _StackFrame._(isCore, library, match[3], match[4], member);
-  }
-}