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packages/stack_trace/test/vm_test.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.
+
+/// This file tests stack_trace's ability to parse live stack traces. It's a
+/// dual of dartium_test.dart, since method names can differ somewhat from
+/// platform to platform. No similar file exists for dart2js since the specific
+/// method names there are implementation details.
+@TestOn('vm')
+
+import 'package:path/path.dart' as path;
+import 'package:stack_trace/stack_trace.dart';
+import 'package:test/test.dart';
+
+String getStackTraceString() {
+  try {
+    throw '';
+  } catch (_, stackTrace) {
+    return stackTrace.toString();
+  }
+}
+
+StackTrace getStackTraceObject() {
+  try {
+    throw '';
+  } catch (_, stackTrace) {
+    return stackTrace;
+  }
+}
+
+Frame getCaller([int level]) {
+  if (level == null) return new Frame.caller();
+  return new Frame.caller(level);
+}
+
+Frame nestedGetCaller(int level) => getCaller(level);
+
+Trace getCurrentTrace([int level]) => new Trace.current(level);
+
+Trace nestedGetCurrentTrace(int level) => getCurrentTrace(level);
+
+void main() {
+  group('Trace', () {
+    test('.parse parses a real stack trace correctly', () {
+      var string = getStackTraceString();
+      var trace = new Trace.parse(string);
+      expect(path.url.basename(trace.frames.first.uri.path),
+          equals('vm_test.dart'));
+      expect(trace.frames.first.member, equals('getStackTraceString'));
+    });
+
+    test('converts from a native stack trace correctly', () {
+      var trace = new Trace.from(getStackTraceObject());
+      expect(path.url.basename(trace.frames.first.uri.path),
+          equals('vm_test.dart'));
+      expect(trace.frames.first.member, equals('getStackTraceObject'));
+    });
+
+    test('.from handles a stack overflow trace correctly', () {
+      overflow() => overflow();
+
+      var trace;
+      try {
+        overflow();
+      } catch (_, stackTrace) {
+        trace = new Trace.from(stackTrace);
+      }
+
+      expect(trace.frames.first.member, equals('main.<fn>.<fn>.overflow'));
+    });
+
+    group('.current()', () {
+      test('with no argument returns a trace starting at the current frame',
+          () {
+        var trace = new Trace.current();
+        expect(trace.frames.first.member, equals('main.<fn>.<fn>.<fn>'));
+      });
+
+      test('at level 0 returns a trace starting at the current frame', () {
+        var trace = new Trace.current(0);
+        expect(trace.frames.first.member, equals('main.<fn>.<fn>.<fn>'));
+      });
+
+      test('at level 1 returns a trace starting at the parent frame', () {
+        var trace = getCurrentTrace(1);
+        expect(trace.frames.first.member, equals('main.<fn>.<fn>.<fn>'));
+      });
+
+      test('at level 2 returns a trace starting at the grandparent frame', () {
+        var trace = nestedGetCurrentTrace(2);
+        expect(trace.frames.first.member, equals('main.<fn>.<fn>.<fn>'));
+      });
+
+      test('throws an ArgumentError for negative levels', () {
+        expect(() => new Trace.current(-1), throwsArgumentError);
+      });
+    });
+  });
+
+  group('Frame.caller()', () {
+    test('with no argument returns the parent frame', () {
+      expect(getCaller().member, equals('main.<fn>.<fn>'));
+    });
+
+    test('at level 0 returns the current frame', () {
+      expect(getCaller(0).member, equals('getCaller'));
+    });
+
+    test('at level 1 returns the current frame', () {
+      expect(getCaller(1).member, equals('main.<fn>.<fn>'));
+    });
+
+    test('at level 2 returns the grandparent frame', () {
+      expect(nestedGetCaller(2).member, equals('main.<fn>.<fn>'));
+    });
+
+    test('throws an ArgumentError for negative levels', () {
+      expect(() => new Frame.caller(-1), throwsArgumentError);
+    });
+  });
+}