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test/source_map_stack_trace_test.dart

 // Copyright (c) 2015, 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.
 
 import 'package:source_maps/source_maps.dart';
 import 'package:source_span/source_span.dart';
 import 'package:stack_trace/stack_trace.dart';
 import 'package:source_map_stack_trace/source_map_stack_trace.dart';
 import 'package:test/test.dart';
 
 /// A simple [Mapping] for tests that don't need anything special.
 final _simpleMapping = parseJson(
     (new SourceMapBuilder()
         ..addSpan(
             new SourceMapSpan.identifier(
                 new SourceLocation(1,
                     line: 1, column: 3, sourceUrl: "foo.dart"),
                 "qux"),
             new SourceSpan(
                 new SourceLocation(8, line: 5, column: 0),
                 new SourceLocation(18, line: 15, column: 0),
                 "\n" * 10)))
         .build("foo.dart.js.map"));
 
 void main() {
   test("maps a JS line and column to a Dart line and span", () {
     var trace = new Trace.parse("foo.dart.js 10:11  foo");
-    var frame = mapStackTrace(_simpleMapping, trace).frames.first;
+    var frame = _mapTrace(_simpleMapping, trace).frames.first;
     expect(frame.uri, equals(Uri.parse("foo.dart")));
 
     // These are +1 because stack_trace is 1-based whereas source_span is
     // 0-basd.
     expect(frame.line, equals(2));
     expect(frame.column, equals(4));
   });
 
   test("ignores JS frames without line info", () {
     var trace = new Trace.parse("""
 foo.dart.js 10:11  foo
 foo.dart.js        bar
 foo.dart.js 10:11  baz
 """);
-    var frames = mapStackTrace(_simpleMapping, trace).frames;
+    var frames = _mapTrace(_simpleMapping, trace).frames;
 
     expect(frames.length, equals(2));
     expect(frames.first.member, equals("foo"));
     expect(frames.last.member, equals("baz"));
   });
 
   test("ignores JS frames without corresponding spans", () {
     var trace = new Trace.parse("""
 foo.dart.js 10:11  foo
 foo.dart.js 1:1   bar
 foo.dart.js 10:11  baz
 """);
 
-    var frames = mapStackTrace(_simpleMapping, trace).frames;
+    var frames = _mapTrace(_simpleMapping, trace).frames;
 
     expect(frames.length, equals(2));
     expect(frames.first.member, equals("foo"));
     expect(frames.last.member, equals("baz"));
   });
 
   test("falls back to column 0 for unlisted column", () {
     var trace = new Trace.parse("foo.dart.js 10  foo");
     var builder = new SourceMapBuilder()
         ..addSpan(
             new SourceMapSpan.identifier(
                 new SourceLocation(1,
                     line: 1, column: 3, sourceUrl: "foo.dart"),
                 "qux"),
             new SourceSpan(
                 new SourceLocation(8, line: 5, column: 0),
                 new SourceLocation(12, line: 9, column: 1),
                 "\n" * 4));
 
     var mapping = parseJson(builder.build("foo.dart.js.map"));
-    var frame = mapStackTrace(mapping, trace).frames.first;
+    var frame = _mapTrace(mapping, trace).frames.first;
     expect(frame.uri, equals(Uri.parse("foo.dart")));
     expect(frame.line, equals(2));
     expect(frame.column, equals(4));
   });
 
   test("uses package: URIs for frames within packageRoot", () {
     var trace = new Trace.parse("foo.dart.js 10  foo");
     var builder = new SourceMapBuilder()
         ..addSpan(
             new SourceMapSpan.identifier(
                 new SourceLocation(1,
                     line: 1, column: 3, sourceUrl: "packages/foo/foo.dart"),
                 "qux"),
             new SourceSpan(
                 new SourceLocation(8, line: 5, column: 0),
                 new SourceLocation(12, line: 9, column: 1),
                 "\n" * 4));
 
     var mapping = parseJson(builder.build("foo.dart.js.map"));
-    var frame = mapStackTrace(mapping, trace, packageRoot: "packages/")
+    var frame = _mapTrace(mapping, trace, packageRoot: "packages/")
         .frames.first;
     expect(frame.uri, equals(Uri.parse("package:foo/foo.dart")));
     expect(frame.line, equals(2));
     expect(frame.column, equals(4));
   });
 
   test("uses dart: URIs for frames within sdkRoot", () {
     var trace = new Trace.parse("foo.dart.js 10  foo");
     var builder = new SourceMapBuilder()
         ..addSpan(
             new SourceMapSpan.identifier(
                 new SourceLocation(1,
                     line: 1, column: 3, sourceUrl: "sdk/lib/async/foo.dart"),
                 "qux"),
             new SourceSpan(
                 new SourceLocation(8, line: 5, column: 0),
                 new SourceLocation(12, line: 9, column: 1),
                 "\n" * 4));
 
     var mapping = parseJson(builder.build("foo.dart.js.map"));
-    var frame = mapStackTrace(mapping, trace, sdkRoot: "sdk/").frames.first;
+    var frame = _mapTrace(mapping, trace, sdkRoot: "sdk/").frames.first;
     expect(frame.uri, equals(Uri.parse("dart:async/foo.dart")));
     expect(frame.line, equals(2));
     expect(frame.column, equals(4));
   });
 
   test("converts a stack chain", () {
     var trace = new Chain([
       new Trace.parse("foo.dart.js 10:11  foo"),
       new Trace.parse("foo.dart.js 10:11  bar")
     ]);
-    var traces = mapStackTrace(_simpleMapping, trace).traces;
+    var traces = _mapChain(_simpleMapping, trace).traces;
 
     var frame = traces.first.frames.single;
     expect(frame.uri, equals(Uri.parse("foo.dart")));
     expect(frame.member, equals("foo"));
     expect(frame.line, equals(2));
     expect(frame.column, equals(4));
 
     frame = traces.last.frames.single;
     expect(frame.uri, equals(Uri.parse("foo.dart")));
     expect(frame.member, equals("bar"));
@@ skipping 42 matching lines @@
       expect(_prettify(r"Foo_bar__baz"), equals("Foo.bar._baz"));
     });
 
     test("lots of stuff", () {
       expect(_prettify(r"lib$Foo.static.lib$Foo_closure.call$0/<"),
           equals("Foo.<fn>"));
     });
   });
 }
 
+/// Like [mapStackTrace], but is guaranteed to return a [Trace] so it can be
+/// inspected.
+Trace _mapTrace(Mapping sourceMap, StackTrace stackTrace,
+    {bool minified: false, packageRoot, sdkRoot}) {
+  return new Trace.from(mapStackTrace(sourceMap, stackTrace,
+      minified: minified, packageRoot: packageRoot, sdkRoot: sdkRoot));
+}
+
+/// Like [mapStackTrace], but is guaranteed to return a [Chain] so it can be
+/// inspected.
+Chain _mapChain(Mapping sourceMap, StackTrace stackTrace,
+    {bool minified: false, packageRoot, sdkRoot}) {
+  return new Chain.forTrace(mapStackTrace(sourceMap, stackTrace,
+      minified: minified, packageRoot: packageRoot, sdkRoot: sdkRoot));
+}
+
 /// Runs the mapper's prettification logic on [member] and returns the result.
 String _prettify(String member) {
   var trace = new Trace([new Frame(Uri.parse("foo.dart.js"), 10, 11, member)]);
-  return mapStackTrace(_simpleMapping, trace).frames.first.member;
+  return _mapTrace(_simpleMapping, trace).frames.first.member;
 }