diff --git a/leetcode/3461/test.cpp b/leetcode/3461/test.cpp
new file mode 100644
index 0000000..02ed0cd
--- /dev/null
+++ b/leetcode/3461/test.cpp
@@ -0,0 +1,39 @@
+#include "test.hpp"
+#include "solution.hpp"
+
+using namespace testing;
+namespace {
+using SolutionList = TypeList<Solution>;
+struct TestCase {
+    TestCase(const YAML::Node &node) {
+        Decode(node["input"]["s"], input.s);
+        Decode(node["expected"], expected);
+    }
+    struct {
+        std::string s;
+    } input;
+    bool expected;
+};
+
+template <typename Solution>
+void RunTest(const std::string &s, const bool expected) {
+    // 检查约束条件
+    ASSERT_THAT(s.size(), AllOf(Ge(3), Le(100))); // 3 <= s.length <= 100
+    ASSERT_THAT(s, Each(Truly(IsDigit)));         // s consists of only digits
+
+    // 测试目标函数
+    Solution solution;
+    EXPECT_EQ(solution.hasSameDigits(s), expected);
+}
+
+template <typename Solution>
+void RunTest(const TestCase &tc) {
+    RunTest<Solution>(tc.input.s, tc.expected);
+}
+
+TEST_Y(LeetCode3461, Example1);
+TEST_Y(LeetCode3461, Example2);
+TEST_Y(LeetCode3461, Regression1);
+TEST_Y(LeetCode3461, Regression2);
+TEST_Y(LeetCode3461, Regression3);
+} // namespace
diff --git a/leetcode/3461/case.yaml b/leetcode/3461/test_suite.yaml
similarity index 100%
rename from leetcode/3461/case.yaml
rename to leetcode/3461/test_suite.yaml
index 1ca8b90..9370ddb 100644
--- a/leetcode/3461/case.yaml
+++ b/leetcode/3461/test_suite.yaml
@@ -15,10 +15,10 @@ regression1:
 
 regression2:
   input:
-    s: "472371665226339635424494604455723348326857778972516313101962164"
+    s: "4802870269162891409411160836125514611"
   expected: true
 
 regression3:
   input:
-    s: "4802870269162891409411160836125514611"
+    s: "472371665226339635424494604455723348326857778972516313101962164"
   expected: true
diff --git a/leetcode/3461/title.txt b/leetcode/3461/title.txt
new file mode 100644
index 0000000..79338d7
--- /dev/null
+++ b/leetcode/3461/title.txt
@@ -0,0 +1 @@
+check-if-digits-are-equal-in-string-after-operations-i
diff --git a/leetcode/test/test.cpp b/leetcode/test/test.cpp
index bb1c9ad..dbb9948 100644
--- a/leetcode/test/test.cpp
+++ b/leetcode/test/test.cpp
@@ -4,6 +4,7 @@
 #include <filesystem>
 #include <ranges>
 
+namespace detail {
 std::string GetTestSuitePath() {
     std::filesystem::path path{PROBLEM_PATH};
     std::string_view suite{testing::UnitTest::GetInstance()->current_test_info()->test_suite_name()};
@@ -17,3 +18,4 @@ std::string GetTestCaseName() {
     name[0] = std::tolower(name[0]);
     return name;
 }
+} // namespace detail
diff --git a/leetcode/test/test.hpp b/leetcode/test/test.hpp
index c13e621..157d3b5 100644
--- a/leetcode/test/test.hpp
+++ b/leetcode/test/test.hpp
@@ -3,8 +3,9 @@
 #include "gtest/gtest.h"
 
 #define TEST_Y(suite, name) \
-    TEST(suite, name) { ::RunTestImpl<SolutionList>::F(::GetTestCase<TestCase>()); }
+    TEST(suite, name) { ::detail::RunTestImpl<SolutionList>::F(::detail::GetTestCase<TestCase>()); }
 
+namespace detail {
 std::string GetTestSuitePath();
 std::string GetTestCaseName();
 
@@ -24,17 +25,9 @@ const TestCase &GetTestCase() {
     static const auto path{GetTestSuitePath()};
     static const auto testSuite{GetTestSuite<TestCase>(path)};
     assert(path == GetTestSuitePath());
-    return testSuite.at(::GetTestCaseName());
+    return testSuite.at(GetTestCaseName());
 }
 
-template <typename T>
-void Decode(const YAML::Node &node, T &t) {
-    t = node.as<std::decay_t<T>>();
-}
-
-template <typename...>
-struct TypeList;
-
 template <typename>
 struct RunTestImpl;
 template <template <typename...> typename TypeList, typename... Solutions>
@@ -44,6 +37,15 @@ struct RunTestImpl<TypeList<Solutions...>> {
         (RunTest<Solutions>(args...), ...);
     }
 };
+} // namespace detail
+
+template <typename T>
+void Decode(const YAML::Node &node, T &t) {
+    t = node.as<std::decay_t<T>>();
+}
+
+template <typename...>
+struct TypeList;
 
 // 用例约束检查
 // 编译期计算10^N，简明定义数据范围
@@ -53,3 +55,4 @@ template <>
 constexpr std::intmax_t E<0>{1};
 
 constexpr bool IsLower(char c) noexcept { return 'a' <= c && c <= 'z'; }
+constexpr bool IsDigit(char c) noexcept { return '0' <= c && c <= '9'; }