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tests/Unit/SensitiveDataTest.php

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+<?php
+
+namespace Tests\Unit;
+
+use App\Support\SensitiveData;
+use PHPUnit\Framework\TestCase;
+
+class SensitiveDataTest extends TestCase
+{
+    public function test_sensitive_data_masking(): void
+    {
+        $this->assertSame('9001****5555', SensitiveData::maskIc('900101105555'));
+        $this->assertSame('123***7890', SensitiveData::maskAccount('1234567890'));
+        $this->assertSame('012****789', SensitiveData::maskPhone('0123456789'));
+        $this->assertSame('-', SensitiveData::maskAccount(null));
+    }
+}