diff --git a/.gitignore b/.gitignore
index 56c3800bf..66c982fe0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 # Don’t commit the following directories created by pub.
 .buildlog
 .dart_tool/
+.vscode/settings.json
 .pub/
 build/
 packages
diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index 8ca0f96ab..cf945f108 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -1,4 +1,8 @@
-## 1.25.16-wip
+## 1.26.0-wip
+
+* `test()` and `group()` functions now take an optional `TestLocation` that will
+  be used as the location of the test in JSON reporters instead of being parsed
+  from the call stack.
 
 ## 1.25.15
 
diff --git a/pkgs/test/pubspec.yaml b/pkgs/test/pubspec.yaml
index 78dabdeda..831485c37 100644
--- a/pkgs/test/pubspec.yaml
+++ b/pkgs/test/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 1.25.16-wip
+version: 1.26.0-wip
 description: >-
   A full featured library for writing and running Dart tests across platforms.
 repository: https://github.com/dart-lang/test/tree/master/pkgs/test
@@ -36,7 +36,7 @@ dependencies:
   stream_channel: ^2.1.0
 
   # Use an exact version until the test_api and test_core package are stable.
-  test_api: 0.7.4
+  test_api: 0.7.5-wip
   test_core: 0.6.9-wip
 
   typed_data: ^1.3.0
diff --git a/pkgs/test/test/runner/engine_test.dart b/pkgs/test/test/runner/engine_test.dart
index 6b7df23e8..6e8bf3deb 100644
--- a/pkgs/test/test/runner/engine_test.dart
+++ b/pkgs/test/test/runner/engine_test.dart
@@ -7,6 +7,7 @@ import 'dart:math';
 
 import 'package:test/test.dart';
 import 'package:test_api/src/backend/group.dart';
+import 'package:test_api/src/backend/group_entry.dart';
 import 'package:test_api/src/backend/state.dart';
 import 'package:test_core/src/runner/engine.dart';
 
@@ -27,8 +28,8 @@ void main() {
     });
 
     var engine = Engine.withSuites([
-      runnerSuite(Group.root(tests.take(2))),
-      runnerSuite(Group.root(tests.skip(2)))
+      runnerSuite(tests.take(2).asRootGroup()),
+      runnerSuite(tests.skip(2).asRootGroup())
     ]);
 
     await engine.run();
@@ -55,7 +56,7 @@ void main() {
         }),
         completes);
 
-    engine.suiteSink.add(runnerSuite(Group.root(tests)));
+    engine.suiteSink.add(runnerSuite(tests.asRootGroup()));
     engine.suiteSink.close();
   });
 
@@ -207,7 +208,7 @@ void main() {
         test('test', () {}, skip: true);
       });
 
-      var engine = Engine.withSuites([runnerSuite(Group.root(tests))]);
+      var engine = Engine.withSuites([runnerSuite(tests.asRootGroup())]);
 
       engine.onTestStarted.listen(expectAsync1((liveTest) {
         expect(liveTest, same(engine.liveTests.single));
@@ -276,7 +277,7 @@ void main() {
         }, skip: true);
       });
 
-      var engine = Engine.withSuites([runnerSuite(Group.root(entries))]);
+      var engine = Engine.withSuites([runnerSuite(entries.asRootGroup())]);
 
       engine.onTestStarted.listen(expectAsync1((liveTest) {
         expect(liveTest, same(engine.liveTests.single));
@@ -341,7 +342,7 @@ void main() {
           for (var i = 0; i < testCount; i++)
             loadSuite('group $i', () async {
               await updateAndCheckConcurrency(isLoadSuite: true);
-              return runnerSuite(Group.root([tests[i]]));
+              return runnerSuite([tests[i]].asRootGroup());
             }),
         ], concurrency: concurrency);
 
@@ -355,3 +356,11 @@ void main() {
     });
   });
 }
+
+extension on Iterable<GroupEntry> {
+  /// Clones these entries into a new root group, assigning the new parent group
+  /// as necessary.
+  Group asRootGroup() {
+    return Group.root(map((entry) => entry.filter((_) => true)!));
+  }
+}
diff --git a/pkgs/test/test/runner/json_reporter_test.dart b/pkgs/test/test/runner/json_reporter_test.dart
index a771438ef..88c4c1413 100644
--- a/pkgs/test/test/runner/json_reporter_test.dart
+++ b/pkgs/test/test/runner/json_reporter_test.dart
@@ -587,6 +587,70 @@ void customTest(String name, dynamic Function() testFn) => test(name, testFn);
 ''',
           });
     });
+
+    test('groups and tests with custom locations', () {
+      return _expectReport('''
+      group('group 1 inferred', () {
+        setUpAll(() {});
+        test('test 1 inferred', () {});
+        tearDownAll(() {});
+      });
+      group('group 2 custom', location: TestLocation(Uri.parse('file:///foo/group'), 123, 234), () {
+        setUpAll(location: TestLocation(Uri.parse('file:///foo/setUpAll'), 345, 456), () {});
+        test('test 2 custom', location: TestLocation(Uri.parse('file:///foo/test'), 567, 789), () {});
+        tearDownAll(location: TestLocation(Uri.parse('file:///foo/tearDownAll'), 890, 901), () {});
+      });
+    ''', [
+        [
+          suiteJson(0),
+          testStartJson(1, 'loading test.dart', groupIDs: []),
+          testDoneJson(1, hidden: true),
+        ],
+        [
+          groupJson(2, testCount: 2),
+          groupJson(3,
+              name: 'group 1 inferred',
+              parentID: 2,
+              line: 6,
+              column: 7,
+              testCount: 1),
+          testStartJson(4, 'group 1 inferred (setUpAll)',
+              groupIDs: [2, 3], line: 7, column: 9),
+          testDoneJson(4, hidden: true),
+          testStartJson(5, 'group 1 inferred test 1 inferred',
+              groupIDs: [2, 3], line: 8, column: 9),
+          testDoneJson(5),
+          testStartJson(6, 'group 1 inferred (tearDownAll)',
+              groupIDs: [2, 3], line: 9, column: 9),
+          testDoneJson(6, hidden: true),
+          groupJson(7,
+              name: 'group 2 custom',
+              parentID: 2,
+              url: 'file:///foo/group',
+              line: 123,
+              column: 234,
+              testCount: 1),
+          testStartJson(8, 'group 2 custom (setUpAll)',
+              url: 'file:///foo/setUpAll',
+              groupIDs: [2, 7],
+              line: 345,
+              column: 456),
+          testDoneJson(8, hidden: true),
+          testStartJson(9, 'group 2 custom test 2 custom',
+              url: 'file:///foo/test',
+              groupIDs: [2, 7],
+              line: 567,
+              column: 789),
+          testDoneJson(9),
+          testStartJson(10, 'group 2 custom (tearDownAll)',
+              url: 'file:///foo/tearDownAll',
+              groupIDs: [2, 7],
+              line: 890,
+              column: 901),
+          testDoneJson(10, hidden: true),
+        ]
+      ], doneJson());
+    });
   });
 
   test(
diff --git a/pkgs/test/test/runner/json_reporter_utils.dart b/pkgs/test/test/runner/json_reporter_utils.dart
index bbdbb78f0..3c921b005 100644
--- a/pkgs/test/test/runner/json_reporter_utils.dart
+++ b/pkgs/test/test/runner/json_reporter_utils.dart
@@ -89,6 +89,7 @@ Map<String, Object> groupJson(int id,
     int? parentID,
     Object? skip,
     int? testCount,
+    String? url,
     int? line,
     int? column}) {
   if ((line == null) != (column == null)) {
@@ -96,6 +97,8 @@ Map<String, Object> groupJson(int id,
         'line and column must either both be null or both be passed');
   }
 
+  url ??=
+      line == null ? null : p.toUri(p.join(d.sandbox, 'test.dart')).toString();
   return {
     'type': 'group',
     'group': {
@@ -107,9 +110,7 @@ Map<String, Object> groupJson(int id,
       'testCount': testCount ?? 1,
       'line': line,
       'column': column,
-      'url': line == null
-          ? null
-          : p.toUri(p.join(d.sandbox, 'test.dart')).toString()
+      'url': url
     }
   };
 }
@@ -117,7 +118,7 @@ Map<String, Object> groupJson(int id,
 /// Returns the event emitted by the JSON reporter indicating that a test has
 /// begun running.
 ///
-/// If [parentIDs] is passed, it's the IDs of groups containing this test. If
+/// If [groupIDs] is passed, it's the IDs of groups containing this test. If
 /// [skip] is `true`, the test is expected to be marked as skipped without a
 /// reason. If it's a [String], the test is expected to be marked as skipped
 /// with that reason.
diff --git a/pkgs/test/test/runner/line_and_col_test.dart b/pkgs/test/test/runner/line_and_col_test.dart
index c513cefc6..3241c4f3f 100644
--- a/pkgs/test/test/runner/line_and_col_test.dart
+++ b/pkgs/test/test/runner/line_and_col_test.dart
@@ -56,13 +56,49 @@ void main() {
       await test.shouldExit(0);
     });
 
+    test('additionally selects test with matching custom location', () async {
+      await d.dir('test').create();
+      var testFileUri = Uri.file(d.file('test/aaa_test.dart').io.path);
+      var notTestFileUri = Uri.file(d.file('test/bbb.dart').io.path);
+      var testFilePackageRelativeUri =
+          Uri.parse('org-dartlang-app:///test/aaa_test.dart');
+      await d.file('test/aaa_test.dart', '''
+        import 'package:test/test.dart';
+
+        void main() {
+          test("a", () {}); // Line 4 from stack trace (match)
+
+          // Custom line 4 (match)
+          test("b", location: TestLocation(Uri.parse('$testFileUri'), 4, 0), () {});
+
+          // Custom line 4 match but using org-dartlang-app (match)
+          test("c", location: TestLocation(Uri.parse('$testFilePackageRelativeUri'), 4, 0), () {});
+
+          // Custom different line, same file (no match)
+          test("d", location: TestLocation(Uri.parse('$testFileUri'), 5, 0), () => throw TestFailure("oh no"));
+
+          // Custom line 4 match but different file (no match)
+          test("e", location: TestLocation(Uri.parse('$notTestFileUri'), 4, 0), () => throw TestFailure("oh no"));
+        }
+      ''').create();
+
+      var test = await runTest(['test/aaa_test.dart?line=4']);
+
+      expect(
+        test.stdout,
+        emitsThrough(contains('+3: All tests passed!')),
+      );
+
+      await test.shouldExit(0);
+    });
+
     test('selects groups with a matching line', () async {
       await d.file('test.dart', '''
         import 'package:test/test.dart';
 
         void main() {
           group("a", () {
-            test("b", () {});
+            test("a", () {});
           });
           group("b", () {
             test("b", () => throw TestFailure("oh no"));
@@ -80,6 +116,53 @@ void main() {
       await test.shouldExit(0);
     });
 
+    test('additionally selects groups with a matching custom location',
+        () async {
+      await d.dir('test').create();
+      var testFileUri = Uri.file(d.file('test/aaa_test.dart').io.path);
+      var notTestFileUri = Uri.file(d.file('test/bbb.dart').io.path);
+      var testFilePackageRelativeUri =
+          Uri.parse('org-dartlang-app:///test/aaa_test.dart');
+      await d.file('test/aaa_test.dart', '''
+        import 'package:test/test.dart';
+
+        void main() {
+          group("a", () { // Line 4 from stack trace (match)
+            test("a", () {});
+          });
+
+          // Custom line 4 (match)
+          group("b", location: TestLocation(Uri.parse('$testFileUri'), 4, 0), () {
+            test("b", () {});
+          });
+
+          // Custom line 4 match but using org-dartlang-app (match)
+          group("c", location: TestLocation(Uri.parse('$testFilePackageRelativeUri'), 4, 0), () {
+            test("c", () {});
+          });
+
+          // Custom different line, same file (no match)
+          group("d", location: TestLocation(Uri.parse('$testFileUri'), 5, 0), () {
+            test("d", () => throw TestFailure("oh no"));
+          });
+
+          // Custom line 4 match but different file (no match)
+          group("e", location: TestLocation(Uri.parse('$notTestFileUri'), 4, 0), () {
+            test("e", () => throw TestFailure("oh no"));
+          });
+        }
+      ''').create();
+
+      var test = await runTest(['test/aaa_test.dart?line=4']);
+
+      expect(
+        test.stdout,
+        emitsThrough(contains('+3: All tests passed!')),
+      );
+
+      await test.shouldExit(0);
+    });
+
     test('No matching tests', () async {
       await d.file('test.dart', '''
         import 'package:test/test.dart';
diff --git a/pkgs/test_api/CHANGELOG.md b/pkgs/test_api/CHANGELOG.md
index 98d65baea..9f25c2de8 100644
--- a/pkgs/test_api/CHANGELOG.md
+++ b/pkgs/test_api/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.7.5-wip
+
+* `test()` and `group()` functions now take an optional `TestLocation` that will
+  be used as the location of the test in JSON reporters instead of being parsed
+  from the call stack.
+
 ## 0.7.4
 
 * Allow `analyzer: '>=6.0.0 <8.0.0'`
diff --git a/pkgs/test_api/lib/backend.dart b/pkgs/test_api/lib/backend.dart
index 5da47b6c3..9289e3d39 100644
--- a/pkgs/test_api/lib/backend.dart
+++ b/pkgs/test_api/lib/backend.dart
@@ -11,3 +11,4 @@ export 'src/backend/runtime.dart' show Runtime;
 export 'src/backend/stack_trace_formatter.dart' show StackTraceFormatter;
 export 'src/backend/stack_trace_mapper.dart' show StackTraceMapper;
 export 'src/backend/suite_platform.dart' show SuitePlatform;
+export 'src/backend/test_location.dart' show TestLocation;
diff --git a/pkgs/test_api/lib/scaffolding.dart b/pkgs/test_api/lib/scaffolding.dart
index 9d864bbb9..979337767 100644
--- a/pkgs/test_api/lib/scaffolding.dart
+++ b/pkgs/test_api/lib/scaffolding.dart
@@ -16,6 +16,7 @@ export 'src/backend/configuration/skip.dart' show Skip;
 export 'src/backend/configuration/tags.dart' show Tags;
 export 'src/backend/configuration/test_on.dart' show TestOn;
 export 'src/backend/configuration/timeout.dart' show Timeout;
+export 'src/backend/test_location.dart' show TestLocation;
 export 'src/scaffolding/spawn_hybrid.dart' show spawnHybridCode, spawnHybridUri;
 export 'src/scaffolding/test_structure.dart'
     show addTearDown, group, setUp, setUpAll, tearDown, tearDownAll, test;
diff --git a/pkgs/test_api/lib/src/backend/declarer.dart b/pkgs/test_api/lib/src/backend/declarer.dart
index 76f7563a7..4e9818d1e 100644
--- a/pkgs/test_api/lib/src/backend/declarer.dart
+++ b/pkgs/test_api/lib/src/backend/declarer.dart
@@ -13,6 +13,7 @@ import 'group_entry.dart';
 import 'invoker.dart';
 import 'metadata.dart';
 import 'test.dart';
+import 'test_location.dart';
 
 /// A class that manages the state of tests as they're declared.
 ///
@@ -44,6 +45,9 @@ class Declarer {
   /// This is `null` for the root (implicit) group.
   final Trace? _trace;
 
+  /// The optional location override for this group.
+  final TestLocation? _location;
+
   /// Whether to collect stack traces for [GroupEntry]s.
   final bool _collectTraces;
 
@@ -69,6 +73,9 @@ class Declarer {
   /// [setUpAll] is always run and the rest are only run if that one succeeds.
   Trace? _setUpAllTrace;
 
+  /// The optional location override for [setUpAll].
+  TestLocation? _setUpAllLocation;
+
   /// The tear-down functions to run once for this group.
   final _tearDownAlls = <void Function()>[];
 
@@ -78,6 +85,9 @@ class Declarer {
   /// one trace. The first trace matches [_setUpAllTrace].
   Trace? _tearDownAllTrace;
 
+  /// The optional location override for [tearDownAll].
+  TestLocation? _tearDownAllLocation;
+
   /// The children of this group, either tests or sub-groups.
   ///
   /// All modifications to this must go through [_addEntry].
@@ -157,6 +167,7 @@ class Declarer {
           platformVariables ?? const UnmodifiableSetView.empty(),
           collectTraces,
           null,
+          null,
           noRetry,
           fullTestName,
           allowDuplicateTestNames ? null : <String>{},
@@ -170,6 +181,7 @@ class Declarer {
     this._platformVariables,
     this._collectTraces,
     this._trace,
+    this._location,
     this._noRetry,
     this._fullTestName,
     this._seenNames,
@@ -189,6 +201,7 @@ class Declarer {
       Object? skip,
       Map<String, dynamic>? onPlatform,
       Object? tags,
+      TestLocation? location,
       int? retry,
       bool solo = false}) {
     _checkNotBuilt('test');
@@ -231,7 +244,10 @@ class Declarer {
           // Make the declarer visible to running tests so that they'll throw
           // useful errors when calling `test()` and `group()` within a test.
           zoneValues: {#test.declarer: this});
-    }, trace: _collectTraces ? Trace.current(2) : null, guarded: false));
+    },
+        trace: _collectTraces ? Trace.current(2) : null,
+        location: location,
+        guarded: false));
 
     if (solo) {
       _soloEntries.add(_entries.last);
@@ -245,6 +261,7 @@ class Declarer {
       Object? skip,
       Map<String, dynamic>? onPlatform,
       Object? tags,
+      TestLocation? location,
       int? retry,
       bool solo = false}) {
     _checkNotBuilt('group');
@@ -272,6 +289,7 @@ class Declarer {
       _platformVariables,
       _collectTraces,
       trace,
+      location,
       _noRetry,
       _fullTestName,
       _seenNames,
@@ -307,16 +325,18 @@ class Declarer {
   }
 
   /// Registers a function to be run once before all tests.
-  void setUpAll(dynamic Function() callback) {
+  void setUpAll(dynamic Function() callback, {TestLocation? location}) {
     _checkNotBuilt('setUpAll');
     if (_collectTraces) _setUpAllTrace ??= Trace.current(2);
+    _setUpAllLocation ??= location;
     _setUpAlls.add(callback);
   }
 
   /// Registers a function to be run once after all tests.
-  void tearDownAll(dynamic Function() callback) {
+  void tearDownAll(dynamic Function() callback, {TestLocation? location}) {
     _checkNotBuilt('tearDownAll');
     if (_collectTraces) _tearDownAllTrace ??= Trace.current(2);
+    _tearDownAllLocation ??= location;
     _tearDownAlls.add(callback);
   }
 
@@ -347,6 +367,7 @@ class Declarer {
     return Group(_name ?? '', entries,
         metadata: _metadata,
         trace: _trace,
+        location: _location,
         setUpAll: _setUpAll,
         tearDownAll: _tearDownAll);
   }
@@ -393,7 +414,11 @@ class Declarer {
           // Make the declarer visible to running scaffolds so they can add to
           // the declarer's `tearDownAll()` list.
           zoneValues: {#test.declarer: this});
-    }, trace: _setUpAllTrace, guarded: false, isScaffoldAll: true);
+    },
+        trace: _setUpAllTrace,
+        location: _setUpAllLocation,
+        guarded: false,
+        isScaffoldAll: true);
   }
 
   /// Returns a [Test] that runs the callbacks in [_tearDownAll], or `null`.
@@ -408,7 +433,11 @@ class Declarer {
           // Make the declarer visible to running scaffolds so they can add to
           // the declarer's `tearDownAll()` list.
           zoneValues: {#test.declarer: this});
-    }, trace: _tearDownAllTrace, guarded: false, isScaffoldAll: true);
+    },
+        trace: _tearDownAllTrace,
+        location: _tearDownAllLocation,
+        guarded: false,
+        isScaffoldAll: true);
   }
 
   void _addEntry(GroupEntry entry) {
diff --git a/pkgs/test_api/lib/src/backend/group.dart b/pkgs/test_api/lib/src/backend/group.dart
index 9a2887523..d90b29d8e 100644
--- a/pkgs/test_api/lib/src/backend/group.dart
+++ b/pkgs/test_api/lib/src/backend/group.dart
@@ -8,6 +8,7 @@ import 'group_entry.dart';
 import 'metadata.dart';
 import 'suite_platform.dart';
 import 'test.dart';
+import 'test_location.dart';
 
 /// A group contains one or more tests and subgroups.
 ///
@@ -16,12 +17,18 @@ class Group implements GroupEntry {
   @override
   final String name;
 
+  @override
+  Group? parent;
+
   @override
   final Metadata metadata;
 
   @override
   final Trace? trace;
 
+  @override
+  final TestLocation? location;
+
   /// The children of this group.
   final List<GroupEntry> entries;
 
@@ -50,9 +57,22 @@ class Group implements GroupEntry {
   int? _testCount;
 
   Group(this.name, Iterable<GroupEntry> entries,
-      {Metadata? metadata, this.trace, this.setUpAll, this.tearDownAll})
+      {Metadata? metadata,
+      this.trace,
+      this.location,
+      this.setUpAll,
+      this.tearDownAll})
       : entries = List<GroupEntry>.unmodifiable(entries),
-        metadata = metadata ?? Metadata();
+        metadata = metadata ?? Metadata() {
+    for (var entry in entries) {
+      assert(entry.parent == null);
+      entry.parent = this;
+    }
+    assert(setUpAll?.parent == null);
+    setUpAll?.parent = this;
+    assert(tearDownAll?.parent == null);
+    tearDownAll?.parent = this;
+  }
 
   @override
   Group? forPlatform(SuitePlatform platform) {
@@ -63,8 +83,9 @@ class Group implements GroupEntry {
     return Group(name, filtered,
         metadata: newMetadata,
         trace: trace,
-        setUpAll: setUpAll,
-        tearDownAll: tearDownAll);
+        location: location,
+        setUpAll: setUpAll?.forPlatform(platform),
+        tearDownAll: tearDownAll?.forPlatform(platform));
   }
 
   @override
@@ -74,6 +95,7 @@ class Group implements GroupEntry {
     return Group(name, filtered,
         metadata: metadata,
         trace: trace,
+        location: location,
         setUpAll: setUpAll,
         tearDownAll: tearDownAll);
   }
diff --git a/pkgs/test_api/lib/src/backend/group_entry.dart b/pkgs/test_api/lib/src/backend/group_entry.dart
index a6f30bd9f..5246efbcc 100644
--- a/pkgs/test_api/lib/src/backend/group_entry.dart
+++ b/pkgs/test_api/lib/src/backend/group_entry.dart
@@ -4,9 +4,11 @@
 
 import 'package:stack_trace/stack_trace.dart';
 
+import 'group.dart';
 import 'metadata.dart';
 import 'suite_platform.dart';
 import 'test.dart';
+import 'test_location.dart';
 
 /// A [Test] or [Group].
 abstract class GroupEntry {
@@ -16,6 +18,12 @@ abstract class GroupEntry {
   /// This will be empty for the root group.
   String get name;
 
+  /// The parent of this entry.
+  ///
+  /// This field is set during during building in the Declarer and also during
+  /// deserialization of the parent.
+  Group? parent;
+
   /// The metadata for the entry, including the metadata from any containing
   /// [Group]s.
   Metadata get metadata;
@@ -24,6 +32,13 @@ abstract class GroupEntry {
   /// entry, or `null` if the entry was defined in a different way.
   Trace? get trace;
 
+  /// An optional location provided to `test()` or `group()` to support test
+  /// frameworks like pkg:test_reflective_loader where the test/group location
+  /// might not be in [trace] at the time `test()` or `group()` are called.
+  ///
+  /// If `null`, the location of a test will try to be inferred from [trace].
+  TestLocation? get location;
+
   /// Returns a copy of [this] with all platform-specific metadata resolved.
   ///
   /// Removes any tests and groups with [Metadata.testOn] selectors that don't
diff --git a/pkgs/test_api/lib/src/backend/invoker.dart b/pkgs/test_api/lib/src/backend/invoker.dart
index 58f1001d9..412e7531e 100644
--- a/pkgs/test_api/lib/src/backend/invoker.dart
+++ b/pkgs/test_api/lib/src/backend/invoker.dart
@@ -18,6 +18,7 @@ import 'suite.dart';
 import 'suite_platform.dart';
 import 'test.dart';
 import 'test_failure.dart';
+import 'test_location.dart';
 import 'util/pretty_print.dart';
 
 /// A test in this isolate.
@@ -31,6 +32,9 @@ class LocalTest extends Test {
   @override
   final Trace? trace;
 
+  @override
+  final TestLocation? location;
+
   /// Whether this is a test defined using `setUpAll()` or `tearDownAll()`.
   final bool isScaffoldAll;
 
@@ -47,11 +51,14 @@ class LocalTest extends Test {
   /// the caller's responsibility to invoke [LiveTest.run] in the context of a
   /// call to [Invoker.guard].
   LocalTest(this.name, this.metadata, this._body,
-      {this.trace, bool guarded = true, this.isScaffoldAll = false})
+      {this.trace,
+      this.location,
+      bool guarded = true,
+      this.isScaffoldAll = false})
       : _guarded = guarded;
 
-  LocalTest._(this.name, this.metadata, this._body, this.trace, this._guarded,
-      this.isScaffoldAll);
+  LocalTest._(this.name, this.metadata, this._body, this.trace, this.location,
+      this._guarded, this.isScaffoldAll);
 
   /// Loads a single runnable instance of this test.
   @override
@@ -64,7 +71,19 @@ class LocalTest extends Test {
   Test? forPlatform(SuitePlatform platform) {
     if (!metadata.testOn.evaluate(platform)) return null;
     return LocalTest._(name, metadata.forPlatform(platform), _body, trace,
-        _guarded, isScaffoldAll);
+        location, _guarded, isScaffoldAll);
+  }
+
+  @override
+  Test? filter(bool Function(Test) callback) {
+    if (callback(this)) {
+      // filter() always returns new copies because they need to be attached
+      // to their new parents.
+      return LocalTest._(
+          name, metadata, _body, trace, location, _guarded, isScaffoldAll);
+    }
+
+    return null;
   }
 }
 
diff --git a/pkgs/test_api/lib/src/backend/remote_listener.dart b/pkgs/test_api/lib/src/backend/remote_listener.dart
index 66a081428..757720904 100644
--- a/pkgs/test_api/lib/src/backend/remote_listener.dart
+++ b/pkgs/test_api/lib/src/backend/remote_listener.dart
@@ -196,6 +196,7 @@ final class RemoteListener {
                   ?.formatStackTrace(group.trace!)
                   .toString() ??
               group.trace?.toString(),
+      'location': group.location?.serialize(),
       'setUpAll': _serializeTest(channel, group.setUpAll, parents),
       'tearDownAll': _serializeTest(channel, group.tearDownAll, parents),
       'entries': group.entries.map((entry) {
@@ -231,6 +232,7 @@ final class RemoteListener {
                   ?.formatStackTrace(test.trace!)
                   .toString() ??
               test.trace?.toString(),
+      'location': test.location?.serialize(),
       'channel': testChannel.id
     };
   }
diff --git a/pkgs/test_api/lib/src/backend/test.dart b/pkgs/test_api/lib/src/backend/test.dart
index 5b5e73a67..45ecde53c 100644
--- a/pkgs/test_api/lib/src/backend/test.dart
+++ b/pkgs/test_api/lib/src/backend/test.dart
@@ -20,6 +20,9 @@ abstract class Test implements GroupEntry {
   @override
   String get name;
 
+  @override
+  Group? parent;
+
   @override
   Metadata get metadata;
 
@@ -38,5 +41,5 @@ abstract class Test implements GroupEntry {
   Test? forPlatform(SuitePlatform platform);
 
   @override
-  Test? filter(bool Function(Test) callback) => callback(this) ? this : null;
+  Test? filter(bool Function(Test) callback);
 }
diff --git a/pkgs/test_api/lib/src/backend/test_location.dart b/pkgs/test_api/lib/src/backend/test_location.dart
new file mode 100644
index 000000000..4f16079de
--- /dev/null
+++ b/pkgs/test_api/lib/src/backend/test_location.dart
@@ -0,0 +1,30 @@
+// Copyright (c) 2025, 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.
+
+/// The location of a test or group.
+class TestLocation {
+  final Uri uri;
+  final int line;
+  final int column;
+
+  TestLocation(this.uri, this.line, this.column);
+
+  /// Serializes [this] into a JSON-safe object that can be deserialized using
+  /// [TestLocation.deserialize].
+  ///
+  /// This method is also used to provide the location in the JSON reporter when
+  /// a custom location is provided for the test.
+  Map<String, dynamic> serialize() {
+    return {
+      'url': uri.toString(),
+      'line': line,
+      'column': column,
+    };
+  }
+
+  /// Deserializes the result of [TestLocation.serialize] into a new [TestLocation].
+  TestLocation.deserialize(Map serialized)
+      : this(Uri.parse(serialized['url'] as String), serialized['line'] as int,
+            serialized['column'] as int);
+}
diff --git a/pkgs/test_api/lib/src/scaffolding/test_structure.dart b/pkgs/test_api/lib/src/scaffolding/test_structure.dart
index 642e0138a..25b2a852b 100644
--- a/pkgs/test_api/lib/src/scaffolding/test_structure.dart
+++ b/pkgs/test_api/lib/src/scaffolding/test_structure.dart
@@ -9,6 +9,7 @@ import 'package:meta/meta.dart';
 import '../backend/configuration/timeout.dart';
 import '../backend/declarer.dart';
 import '../backend/invoker.dart';
+import '../backend/test_location.dart';
 
 // test_core does not support running tests directly, so the Declarer should
 // always be on the Zone.
@@ -77,6 +78,7 @@ void test(Object? description, dynamic Function() body,
     Object? tags,
     Map<String, dynamic>? onPlatform,
     int? retry,
+    TestLocation? location,
     // TODO(https://github.com/dart-lang/test/issues/2205): Remove deprecated.
     @Deprecated('Debug only') @doNotSubmit bool solo = false}) {
   _declarer.test(description.toString(), body,
@@ -86,6 +88,7 @@ void test(Object? description, dynamic Function() body,
       onPlatform: onPlatform,
       tags: tags,
       retry: retry,
+      location: location,
       solo: solo);
 
   // Force dart2js not to inline this function. We need it to be separate from
@@ -156,6 +159,7 @@ void group(Object? description, dynamic Function() body,
     Object? tags,
     Map<String, dynamic>? onPlatform,
     int? retry,
+    TestLocation? location,
     // TODO(https://github.com/dart-lang/test/issues/2205): Remove deprecated.
     @Deprecated('Debug only') @doNotSubmit bool solo = false}) {
   _declarer.group(description.toString(), body,
@@ -165,6 +169,7 @@ void group(Object? description, dynamic Function() body,
       tags: tags,
       onPlatform: onPlatform,
       retry: retry,
+      location: location,
       solo: solo);
 
   // Force dart2js not to inline this function. We need it to be separate from
@@ -234,7 +239,8 @@ void addTearDown(dynamic Function() callback) {
 /// dependencies between tests that should be isolated. In general, you should
 /// prefer [setUp], and only use [setUpAll] if the callback is prohibitively
 /// slow.
-void setUpAll(dynamic Function() callback) => _declarer.setUpAll(callback);
+void setUpAll(dynamic Function() callback, {TestLocation? location}) =>
+    _declarer.setUpAll(callback, location: location);
 
 /// Registers a function to be run once after all tests.
 ///
@@ -247,5 +253,5 @@ void setUpAll(dynamic Function() callback) => _declarer.setUpAll(callback);
 /// dependencies between tests that should be isolated. In general, you should
 /// prefer [tearDown], and only use [tearDownAll] if the callback is
 /// prohibitively slow.
-void tearDownAll(dynamic Function() callback) =>
-    _declarer.tearDownAll(callback);
+void tearDownAll(dynamic Function() callback, {TestLocation? location}) =>
+    _declarer.tearDownAll(callback, location: location);
diff --git a/pkgs/test_api/pubspec.yaml b/pkgs/test_api/pubspec.yaml
index 09cdd39a8..2fd43485a 100644
--- a/pkgs/test_api/pubspec.yaml
+++ b/pkgs/test_api/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test_api
-version: 0.7.4
+version: 0.7.5-wip
 description: >-
   The user facing API for structuring Dart tests and checking expectations.
 repository: https://github.com/dart-lang/test/tree/master/pkgs/test_api
diff --git a/pkgs/test_core/CHANGELOG.md b/pkgs/test_core/CHANGELOG.md
index 9935d9dc0..c6423f719 100644
--- a/pkgs/test_core/CHANGELOG.md
+++ b/pkgs/test_core/CHANGELOG.md
@@ -1,6 +1,9 @@
 ## 0.6.9-wip
 
-- Add support for native assets for `dart test` in pub workspaces.
+* Add support for native assets for `dart test` in pub workspaces.
+* `test()` and `group()` functions now take an optional `TestLocation` that will
+  be used as the location of the test in JSON reporters instead of being parsed
+  from the call stack.
 
 ## 0.6.8
 
diff --git a/pkgs/test_core/lib/src/runner.dart b/pkgs/test_core/lib/src/runner.dart
index ee648d46e..af8e9c96d 100644
--- a/pkgs/test_core/lib/src/runner.dart
+++ b/pkgs/test_core/lib/src/runner.dart
@@ -309,11 +309,12 @@ class Runner {
             var line = selection.line;
             var col = selection.col;
             if (line == null && col == null) return true;
+
             var trace = test.trace;
-            if (trace == null) {
+            if (trace == null && test.location == null) {
               throw StateError(
                   'Cannot filter by line/column for this test suite, no stack'
-                  'trace available.');
+                  'trace or location available.');
             }
             var path = suite.path;
             if (path == null) {
@@ -322,12 +323,14 @@ class Runner {
                   'path available.');
             }
             // The absolute path as it will appear in stack traces.
-            var absoluteSuitePath = File(path).absolute.uri.toFilePath();
+            var suiteUri = File(path).absolute.uri;
+            var absoluteSuitePath = suiteUri.toFilePath();
 
-            bool matchLineAndCol(Frame frame) {
-              switch (frame.uri.scheme) {
+            /// Helper to check if [uri] matches the suite path.
+            bool matchesUri(Uri uri) {
+              switch (uri.scheme) {
                 case 'file':
-                  if (frame.uri.toFilePath() != absoluteSuitePath) {
+                  if (uri.toFilePath() != absoluteSuitePath) {
                     return false;
                   }
                 case 'package':
@@ -338,11 +341,34 @@ class Runner {
                   // Now we can assume that the kernel is compiled using
                   // --filesystem-scheme.
                   // In this case, because we don't know the --filesystem-root, as
-                  // long as the file path matches we assume it is the same file.
-                  if (!absoluteSuitePath.endsWith(frame.uri.path)) {
+                  // long as the path matches we assume it is the same file.
+                  if (!suiteUri.path.endsWith(uri.path)) {
                     return false;
                   }
               }
+
+              return true;
+            }
+
+            // First check if we're a match for the overridden location for this
+            // item or any parents.
+            var current = test as GroupEntry?;
+            while (current != null) {
+              if (current.location case var location?) {
+                if ((line == null || location.line == line) &&
+                    (col == null || location.column == col) &&
+                    matchesUri(location.uri)) {
+                  return true;
+                }
+              }
+              current = current.parent;
+            }
+
+            /// Helper to check if [frame] matches the suite path, line and col.
+            bool matchLineAndCol(Frame frame) {
+              if (!matchesUri(frame.uri)) {
+                return false;
+              }
               if (line != null && frame.line != line) {
                 return false;
               }
@@ -352,7 +378,8 @@ class Runner {
               return true;
             }
 
-            return trace.frames.any(matchLineAndCol);
+            // Check if any frames in the stack trace match.
+            return trace?.frames.any(matchLineAndCol) ?? false;
           });
         }));
       });
diff --git a/pkgs/test_core/lib/src/runner/engine.dart b/pkgs/test_core/lib/src/runner/engine.dart
index 6a6362761..4404d1c5c 100644
--- a/pkgs/test_core/lib/src/runner/engine.dart
+++ b/pkgs/test_core/lib/src/runner/engine.dart
@@ -404,7 +404,8 @@ class Engine {
   Future _runSkippedTest(LiveSuiteController suiteController, Test test,
       List<Group> parents) async {
     await _onUnpaused;
-    var skipped = LocalTest(test.name, test.metadata, () {}, trace: test.trace);
+    var skipped = LocalTest(test.name, test.metadata, () {},
+        trace: test.trace, location: test.location);
 
     late LiveTestController controller;
     controller =
diff --git a/pkgs/test_core/lib/src/runner/plugin/platform_helpers.dart b/pkgs/test_core/lib/src/runner/plugin/platform_helpers.dart
index 450dedbc7..e64ed04dd 100644
--- a/pkgs/test_core/lib/src/runner/plugin/platform_helpers.dart
+++ b/pkgs/test_core/lib/src/runner/plugin/platform_helpers.dart
@@ -8,7 +8,7 @@ import 'dart:io';
 import 'package:stack_trace/stack_trace.dart';
 import 'package:stream_channel/stream_channel.dart';
 import 'package:test_api/backend.dart'
-    show Metadata, RemoteException, SuitePlatform;
+    show Metadata, RemoteException, SuitePlatform, TestLocation;
 import 'package:test_api/src/backend/group.dart'; // ignore: implementation_imports
 import 'package:test_api/src/backend/test.dart'; // ignore: implementation_imports
 
@@ -132,17 +132,22 @@ class _Deserializer {
   /// Deserializes [group] into a concrete [Group].
   Group deserializeGroup(Map group) {
     var metadata = Metadata.deserialize(group['metadata'] as Map);
-    return Group(
-        group['name'] as String,
-        (group['entries'] as List).map((entry) {
-          var map = entry as Map;
-          if (map['type'] == 'group') return deserializeGroup(map);
-          return _deserializeTest(map)!;
-        }),
+    var trace =
+        group['trace'] == null ? null : Trace.parse(group['trace'] as String);
+    var location = switch (group['location']) {
+      Map map => TestLocation.deserialize(map),
+      _ => null,
+    };
+    var entries = (group['entries'] as List).map((entry) {
+      var map = entry as Map;
+      if (map['type'] == 'group') return deserializeGroup(map);
+      return _deserializeTest(map)!;
+    }).toList();
+
+    return Group(group['name'] as String, entries,
         metadata: metadata,
-        trace: group['trace'] == null
-            ? null
-            : Trace.parse(group['trace'] as String),
+        trace: trace,
+        location: location,
         setUpAll: _deserializeTest(group['setUpAll'] as Map?),
         tearDownAll: _deserializeTest(group['tearDownAll'] as Map?));
   }
@@ -156,7 +161,12 @@ class _Deserializer {
     var metadata = Metadata.deserialize(test['metadata'] as Map);
     var trace =
         test['trace'] == null ? null : Trace.parse(test['trace'] as String);
+    var location = switch (test['location']) {
+      Map map => TestLocation.deserialize(map),
+      _ => null,
+    };
     var testChannel = _channel.virtualChannel((test['channel'] as num).toInt());
-    return RunnerTest(test['name'] as String, metadata, trace, testChannel);
+    return RunnerTest(
+        test['name'] as String, metadata, trace, location, testChannel);
   }
 }
diff --git a/pkgs/test_core/lib/src/runner/reporter/json.dart b/pkgs/test_core/lib/src/runner/reporter/json.dart
index b56f030df..9f582eeab 100644
--- a/pkgs/test_core/lib/src/runner/reporter/json.dart
+++ b/pkgs/test_core/lib/src/runner/reporter/json.dart
@@ -16,6 +16,7 @@ import 'package:test_api/src/backend/live_test.dart'; // ignore: implementation_
 import 'package:test_api/src/backend/metadata.dart'; // ignore: implementation_imports
 import 'package:test_api/src/backend/state.dart'; // ignore: implementation_imports
 import 'package:test_api/src/backend/suite.dart'; // ignore: implementation_imports
+import 'package:test_api/src/backend/test_location.dart'; // ignore: implementation_imports
 
 import '../../platform.dart';
 import '../engine.dart';
@@ -139,7 +140,11 @@ class JsonReporter implements Reporter {
         'suiteID': suiteID,
         'groupIDs': groupIDs,
         'metadata': _serializeMetadata(suiteConfig, liveTest.test.metadata),
-        ..._frameInfo(suiteConfig, liveTest.test.trace, liveTest.suite.platform,
+        ..._locationInfo(
+            suiteConfig,
+            liveTest.test.trace,
+            liveTest.test.location,
+            liveTest.suite.platform,
             liveTest.suite.path!),
       }
     });
@@ -224,7 +229,8 @@ class JsonReporter implements Reporter {
           'name': group.name,
           'metadata': _serializeMetadata(suiteConfig, group.metadata),
           'testCount': group.testCount,
-          ..._frameInfo(suiteConfig, group.trace, suite.platform, suite.path!)
+          ..._locationInfo(suiteConfig, group.trace, group.location,
+              suite.platform, suite.path!)
         }
       });
       parentID = id;
@@ -297,8 +303,17 @@ class JsonReporter implements Reporter {
   /// If javascript traces are enabled and the test is on a javascript platform,
   /// or if the [trace] is null or empty, then the line, column, and url will
   /// all be `null`.
-  Map<String, dynamic> _frameInfo(SuiteConfiguration suiteConfig, Trace? trace,
-      SuitePlatform platform, String suitePath) {
+  Map<String, dynamic> _locationInfo(
+      SuiteConfiguration suiteConfig,
+      Trace? trace,
+      TestLocation? location,
+      SuitePlatform platform,
+      String suitePath) {
+    // If this test has a location override, always use that.
+    if (location != null) {
+      return location.serialize();
+    }
+
     var absoluteSuitePath = p.canonicalize(p.absolute(suitePath));
     var frame = trace?.frames.first;
     if (frame == null || (suiteConfig.jsTrace && platform.compiler.isJS)) {
diff --git a/pkgs/test_core/lib/src/runner/runner_test.dart b/pkgs/test_core/lib/src/runner/runner_test.dart
index 2823983e2..677562477 100644
--- a/pkgs/test_core/lib/src/runner/runner_test.dart
+++ b/pkgs/test_core/lib/src/runner/runner_test.dart
@@ -7,7 +7,7 @@ import 'dart:async';
 import 'package:stack_trace/stack_trace.dart';
 import 'package:stream_channel/stream_channel.dart';
 import 'package:test_api/backend.dart'
-    show Metadata, RemoteException, SuitePlatform;
+    show Metadata, RemoteException, SuitePlatform, TestLocation;
 import 'package:test_api/src/backend/group.dart'; // ignore: implementation_imports
 import 'package:test_api/src/backend/live_test.dart'; // ignore: implementation_imports
 import 'package:test_api/src/backend/live_test_controller.dart'; // ignore: implementation_imports
@@ -26,11 +26,14 @@ class RunnerTest extends Test {
   final Metadata metadata;
   @override
   final Trace? trace;
+  @override
+  final TestLocation? location;
 
   /// The channel used to communicate with the test's `RemoteListener`.
   final MultiChannel _channel;
 
-  RunnerTest(this.name, this.metadata, this.trace, this._channel);
+  RunnerTest(
+      this.name, this.metadata, this.trace, this.location, this._channel);
 
   @override
   LiveTest load(Suite suite, {Iterable<Group>? groups}) {
@@ -103,6 +106,18 @@ class RunnerTest extends Test {
   @override
   Test? forPlatform(SuitePlatform platform) {
     if (!metadata.testOn.evaluate(platform)) return null;
-    return RunnerTest(name, metadata.forPlatform(platform), trace, _channel);
+    return RunnerTest(
+        name, metadata.forPlatform(platform), trace, location, _channel);
+  }
+
+  @override
+  Test? filter(bool Function(Test) callback) {
+    if (callback(this)) {
+      // filter() always returns new copies because they need to be attached
+      // to their new parents.
+      return RunnerTest(name, metadata, trace, location, _channel);
+    }
+
+    return null;
   }
 }
diff --git a/pkgs/test_core/lib/src/scaffolding.dart b/pkgs/test_core/lib/src/scaffolding.dart
index 31b3d899a..cb28b6203 100644
--- a/pkgs/test_core/lib/src/scaffolding.dart
+++ b/pkgs/test_core/lib/src/scaffolding.dart
@@ -140,6 +140,7 @@ void test(Object? description, dynamic Function() body,
     Object? tags,
     Map<String, dynamic>? onPlatform,
     int? retry,
+    TestLocation? location,
     // TODO(https://github.com/dart-lang/test/issues/2205): Remove deprecated.
     @Deprecated('Debug only') @doNotSubmit bool solo = false}) {
   _declarer.test(description.toString(), body,
@@ -149,6 +150,7 @@ void test(Object? description, dynamic Function() body,
       onPlatform: onPlatform,
       tags: tags,
       retry: retry,
+      location: location,
       solo: solo);
 
   // Force dart2js not to inline this function. We need it to be separate from
@@ -219,6 +221,7 @@ void group(Object? description, dynamic Function() body,
     Object? tags,
     Map<String, dynamic>? onPlatform,
     int? retry,
+    TestLocation? location,
     // TODO(https://github.com/dart-lang/test/issues/2205): Remove deprecated.
     @Deprecated('Debug only') @doNotSubmit bool solo = false}) {
   _declarer.group(description.toString(), body,
@@ -228,6 +231,7 @@ void group(Object? description, dynamic Function() body,
       tags: tags,
       onPlatform: onPlatform,
       retry: retry,
+      location: location,
       solo: solo);
 
   // Force dart2js not to inline this function. We need it to be separate from
@@ -278,7 +282,8 @@ void tearDown(dynamic Function() callback) => _declarer.tearDown(callback);
 /// dependencies between tests that should be isolated. In general, you should
 /// prefer [setUp], and only use [setUpAll] if the callback is prohibitively
 /// slow.
-void setUpAll(dynamic Function() callback) => _declarer.setUpAll(callback);
+void setUpAll(dynamic Function() callback, {TestLocation? location}) =>
+    _declarer.setUpAll(callback, location: location);
 
 /// Registers a function to be run once after all tests.
 ///
@@ -291,5 +296,5 @@ void setUpAll(dynamic Function() callback) => _declarer.setUpAll(callback);
 /// dependencies between tests that should be isolated. In general, you should
 /// prefer [tearDown], and only use [tearDownAll] if the callback is
 /// prohibitively slow.
-void tearDownAll(dynamic Function() callback) =>
-    _declarer.tearDownAll(callback);
+void tearDownAll(dynamic Function() callback, {TestLocation? location}) =>
+    _declarer.tearDownAll(callback, location: location);
diff --git a/pkgs/test_core/pubspec.yaml b/pkgs/test_core/pubspec.yaml
index e5655b974..bf8cc83dc 100644
--- a/pkgs/test_core/pubspec.yaml
+++ b/pkgs/test_core/pubspec.yaml
@@ -28,7 +28,7 @@ dependencies:
   stack_trace: ^1.10.0
   stream_channel: ^2.1.0
   # Use an exact version until the test_api package is stable.
-  test_api: 0.7.4
+  test_api: 0.7.5-wip
   vm_service: ">=6.0.0 <16.0.0"
   yaml: ^3.0.0