diff --git a/test/unit/StringValidatorTest.php b/test/unit/StringValidatorTest.php
new file mode 100644
index 0000000..0b7b40e
--- /dev/null
+++ b/test/unit/StringValidatorTest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Test\Unit;
+
+use Test\TestCase;
+use Web3\Validators\StringValidator;
+
+class StringValidatorTest extends TestCase
+{
+    /**
+     * validator
+     * 
+     * @var \Web3\Validators\StringValidator
+     */
+    protected $validator;
+
+    /**
+     * setUp
+     * 
+     * @return void
+     */
+    public function setUp()
+    {
+        parent::setUp();
+        $this->validator = new StringValidator;
+    }
+
+    /**
+     * testValidate
+     * 
+     * @return void
+     */
+    public function testValidate()
+    {
+        $validator = $this->validator;
+
+        $this->assertEquals(true, $validator->validate('0Xca35b7d915458ef540ade6068dfe2f44e8fa733c'));
+        $this->assertEquals(false, $validator->validate(1234));
+        $this->assertEquals(false, $validator->validate(0xCA35B7D915458EF540ADE6068DFE2F44E8FA733C));
+    }
+}
\ No newline at end of file