diff --git a/tests/test.class.StringBuilder.php b/tests/test.class.StringBuilder.php
new file mode 100644
index 0000000..790a66e
--- /dev/null
+++ b/tests/test.class.StringBuilder.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Tests\AppBundle;
+
+include_once(__DIR__.'/../vendor/autoload.php');
+require_once(__DIR__.'/../src/class.StringBuilder.php');
+
+use PHPUnit\Framework\TestCase;
+
+class StringBuilderTest extends TestCase {
+
+    public function testSettingVariable() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->setVar("t1", "test1")->setVar("t2", "test2");
+        $this->assertEquals($sb->getVars(), ["t1" => "test1", "t2" => "test2"]);
+    }
+
+    public function testAppendString() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->append("test1")->append("test2");
+        $this->assertEquals($sb->getParts(), ["test1", "test2"]);
+    }
+
+    public function testJoinString() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->append("test1")->append("test2");
+        $sb->setSeperator(";");
+        $this->assertEquals($sb->join(), "test1;test2");
+    }
+
+    public function testJoinUniqueString() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->append("test1")->append("test2")->append("test1");
+        $sb->setSeperator(";");
+        $this->assertEquals($sb->joinUnique(), "test1;test2");
+    }
+
+    public function testContainsPart() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->append("test1")->append("test2");
+        $this->assertTrue($sb->contains("test1"));
+        $this->assertTrue($sb->contains("test2"));
+        $this->assertFalse($sb->contains("test3"));
+    }
+
+    public function testJoinInitUniqueString() {
+        $sb = new \NAE\String\StringBuilder(true);
+        $sb->append("test1")->append("test2")->append("test1");
+        $sb->setSeperator(";");
+        $this->assertEquals($sb->join(), "test1;test2");
+    }
+
+}
\ No newline at end of file