diff --git a/pkg/linter/test/rule_test.dart b/pkg/linter/test/rule_test.dart
index a3605399b6b0..d0f5bb2aa6bc 100644
--- a/pkg/linter/test/rule_test.dart
+++ b/pkg/linter/test/rule_test.dart
@@ -16,7 +16,6 @@ import 'package:analyzer/src/lint/registry.dart';
 import 'package:linter/src/analyzer.dart';
 import 'package:linter/src/ast.dart';
 import 'package:linter/src/rules.dart';
-import 'package:linter/src/rules/implementation_imports.dart';
 import 'package:linter/src/rules/package_prefixed_library_names.dart';
 import 'package:linter/src/test_utilities/annotation.dart';
 import 'package:linter/src/test_utilities/formatter.dart';
@@ -59,62 +58,6 @@ void defineRuleTests() {
 }
 
 void defineRuleUnitTests() {
-  group('uris', () {
-    group('isPackage', () {
-      for (var uri in [
-        Uri.parse('package:foo/src/bar.dart'),
-        Uri.parse('package:foo/src/baz/bar.dart')
-      ]) {
-        test(uri.toString(), () {
-          expect(isPackage(uri), isTrue);
-        });
-      }
-      for (var uri in [
-        Uri.parse('foo/bar.dart'),
-        Uri.parse('src/bar.dart'),
-        Uri.parse('dart:async')
-      ]) {
-        test(uri.toString(), () {
-          expect(isPackage(uri), isFalse);
-        });
-      }
-    });
-
-    group('samePackage', () {
-      test('identity', () {
-        expect(
-            samePackage(Uri.parse('package:foo/src/bar.dart'),
-                Uri.parse('package:foo/src/bar.dart')),
-            isTrue);
-      });
-      test('foo/bar.dart', () {
-        expect(
-            samePackage(Uri.parse('package:foo/src/bar.dart'),
-                Uri.parse('package:foo/bar.dart')),
-            isTrue);
-      });
-    });
-
-    group('implementation', () {
-      for (var uri in [
-        Uri.parse('package:foo/src/bar.dart'),
-        Uri.parse('package:foo/src/baz/bar.dart')
-      ]) {
-        test(uri.toString(), () {
-          expect(isImplementation(uri), isTrue);
-        });
-      }
-      for (var uri in [
-        Uri.parse('package:foo/bar.dart'),
-        Uri.parse('src/bar.dart')
-      ]) {
-        test(uri.toString(), () {
-          expect(isImplementation(uri), isFalse);
-        });
-      }
-    });
-  });
-
   group('names', () {
     group('keywords', () {
       var good = ['class', 'if', 'assert', 'catch', 'import'];
diff --git a/pkg/linter/test/rules/all.dart b/pkg/linter/test/rules/all.dart
index 8e46357f9e29..440287cd1c0f 100644
--- a/pkg/linter/test/rules/all.dart
+++ b/pkg/linter/test/rules/all.dart
@@ -113,6 +113,7 @@ import 'exhaustive_cases_test.dart' as exhaustive_cases;
 import 'file_names_test.dart' as file_names;
 import 'flutter_style_todos_test.dart' as flutter_style_todos;
 import 'hash_and_equals_test.dart' as hash_and_equals;
+import 'implementation_imports_test.dart' as implementation_imports;
 import 'implicit_call_tearoffs_test.dart' as implicit_call_tearoffs;
 import 'implicit_reopen_test.dart' as implicit_reopen;
 import 'invalid_case_patterns_test.dart' as invalid_case_patterns;
@@ -381,6 +382,7 @@ void main() {
   file_names.main();
   flutter_style_todos.main();
   hash_and_equals.main();
+  implementation_imports.main();
   implicit_call_tearoffs.main();
   implicit_reopen.main();
   invalid_case_patterns.main();
diff --git a/pkg/linter/test/rules/implementation_imports_test.dart b/pkg/linter/test/rules/implementation_imports_test.dart
new file mode 100644
index 000000000000..c6d7bd29dc0b
--- /dev/null
+++ b/pkg/linter/test/rules/implementation_imports_test.dart
@@ -0,0 +1,94 @@
+// Copyright (c) 2024, 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:linter/src/rules/implementation_imports.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../rule_test_support.dart';
+
+void main() {
+  group('uris', () {
+    group('isPackage', () {
+      for (var uri in [
+        Uri.parse('package:foo/src/bar.dart'),
+        Uri.parse('package:foo/src/baz/bar.dart')
+      ]) {
+        test(uri.toString(), () {
+          expect(isPackage(uri), isTrue);
+        });
+      }
+      for (var uri in [
+        Uri.parse('foo/bar.dart'),
+        Uri.parse('src/bar.dart'),
+        Uri.parse('dart:async')
+      ]) {
+        test(uri.toString(), () {
+          expect(isPackage(uri), isFalse);
+        });
+      }
+    });
+
+    group('samePackage', () {
+      test('identity', () {
+        expect(
+            samePackage(Uri.parse('package:foo/src/bar.dart'),
+                Uri.parse('package:foo/src/bar.dart')),
+            isTrue);
+      });
+      test('foo/bar.dart', () {
+        expect(
+            samePackage(Uri.parse('package:foo/src/bar.dart'),
+                Uri.parse('package:foo/bar.dart')),
+            isTrue);
+      });
+    });
+  });
+
+  group('implementation', () {
+    for (var uri in [
+      Uri.parse('package:foo/src/bar.dart'),
+      Uri.parse('package:foo/src/baz/bar.dart')
+    ]) {
+      test(uri.toString(), () {
+        expect(isImplementation(uri), isTrue);
+      });
+    }
+    for (var uri in [
+      Uri.parse('package:foo/bar.dart'),
+      Uri.parse('src/bar.dart')
+    ]) {
+      test(uri.toString(), () {
+        expect(isImplementation(uri), isFalse);
+      });
+    }
+  });
+
+  defineReflectiveSuite(() {
+    defineReflectiveTests(ImplementationImportsTest);
+  });
+}
+
+@reflectiveTest
+class ImplementationImportsTest extends LintRuleTest {
+  @override
+  bool get addFlutterPackageDep => true;
+
+  @override
+  String get lintRule => 'implementation_imports';
+  test_inPartFile() async {
+    newFile('$testPackageRootPath/test/a.dart', r'''
+part 'test.dart';
+''');
+
+    await assertDiagnostics(r'''
+part of 'a.dart';
+
+import 'package:flutter/src/material/colors.dart';
+''', [
+      error(WarningCode.UNUSED_IMPORT, 26, 42),
+      lint(26, 42),
+    ]);
+  }
+}