diff --git a/test/rules/all.dart b/test/rules/all.dart
index e6f5b8380..22fe4e837 100644
--- a/test/rules/all.dart
+++ b/test/rules/all.dart
@@ -155,6 +155,8 @@ import 'unnecessary_overrides_test.dart' as unnecessary_overrides;
 import 'unnecessary_parenthesis_test.dart' as unnecessary_parenthesis;
 import 'unnecessary_statements_test.dart' as unnecessary_statements;
 import 'unnecessary_string_escapes_test.dart' as unnecessary_string_escapes;
+import 'unnecessary_string_interpolations_test.dart'
+    as unnecessary_string_interpolations;
 import 'unnecessary_this_test.dart' as unnecessary_this;
 import 'unnecessary_to_list_in_spreads_test.dart'
     as unnecessary_to_list_in_spreads;
@@ -297,6 +299,7 @@ void main() {
   unnecessary_parenthesis.main();
   unnecessary_statements.main();
   unnecessary_string_escapes.main();
+  unnecessary_string_interpolations.main();
   unnecessary_this.main();
   unnecessary_to_list_in_spreads.main();
   unreachable_from_main.main();
diff --git a/test/rules/unnecessary_string_interpolations_test.dart b/test/rules/unnecessary_string_interpolations_test.dart
new file mode 100644
index 000000000..6171444b1
--- /dev/null
+++ b/test/rules/unnecessary_string_interpolations_test.dart
@@ -0,0 +1,92 @@
+// Copyright (c) 2023, 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:test_reflective_loader/test_reflective_loader.dart';
+
+import '../rule_test_support.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(UnnecessaryStringInterpolationsTest);
+  });
+}
+
+@reflectiveTest
+class UnnecessaryStringInterpolationsTest extends LintRuleTest {
+  @override
+  String get lintRule => 'unnecessary_string_interpolations';
+
+  test_necessaryInterpolation_adjascentStrings() async {
+    await assertNoDiagnostics(r'''
+var a = '';
+var b = 'x' '$a';
+''');
+  }
+
+  test_necessaryInterpolation_nullableString() async {
+    await assertNoDiagnostics(r'''
+class Node {
+  String? x = '';
+  String f() => '$x';
+}
+''');
+  }
+
+  test_necessaryInterpolation_property() async {
+    await assertNoDiagnostics(r'''
+var a = '';
+var b = '${a.length}';
+''');
+  }
+
+  test_necessaryInterpolation_single() async {
+    await assertNoDiagnostics(r'''
+var a = '';
+var b = 'x$a';
+''');
+  }
+
+  test_necessaryInterpolation_triple() async {
+    await assertNoDiagnostics(r"""
+var a = '';
+var b = '''x$a''';
+""");
+  }
+
+  test_unnecessaryInterpolation_single() async {
+    await assertDiagnostics(r'''
+var a = '';
+var b = '$a';
+''', [
+      lint(20, 4),
+    ]);
+  }
+
+  test_unnecessaryInterpolation_substring() async {
+    await assertDiagnostics(r'''
+var a = '';
+var b = '${a.substring(1)}';
+''', [
+      lint(20, 19),
+    ]);
+  }
+
+  test_unnecessaryInterpolation_triple() async {
+    await assertDiagnostics(r"""
+var a = '';
+var b = '''$a''';
+""", [
+      lint(20, 8),
+    ]);
+  }
+
+  test_unnecessaryInterpolation_withBraces() async {
+    await assertDiagnostics(r'''
+var a = '';
+var b = '${a}';
+''', [
+      lint(20, 6),
+    ]);
+  }
+}
diff --git a/test_data/rules/unnecessary_string_interpolations.dart b/test_data/rules/unnecessary_string_interpolations.dart
deleted file mode 100644
index a6871d7a8..000000000
--- a/test_data/rules/unnecessary_string_interpolations.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-// test w/ `dart test -N unnecessary_string_interpolations`
-
-class Node {
-  final String? text = '';
-  @override
-  String toString() => '$text'; // OK
-}
-
-String o = '';
-
-f() {
-  o = '$o'; // LINT
-  o = '''$o'''; // LINT
-  o = '${o}'; // LINT
-  o = '${o.substring(1)}'; // LINT
-  o = '${o.length}'; // OK
-  o = 'a$o'; // OK
-  o = '''a$o'''; // OK
-  o = 'a' '$o'; // OK
-}