diff --git a/tests/test.class.StringBuilder.php b/tests/test.class.StringBuilder.php
index 1a9b8e2..d3667e4 100644
--- a/tests/test.class.StringBuilder.php
+++ b/tests/test.class.StringBuilder.php
@@ -119,4 +119,31 @@ class StringBuilderTest extends TestCase {
         $this->assertFalse($sb->hasVar("t3"));
     }
 
+    public function testSetSeperator() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->setSeperator(";");
+        $this->assertEquals($sb->getSeperator(), ";");
+    }
+
+    public function testSetParts() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->setParts(["test1", "test2"])->setSeperator(";");
+        $this->assertEquals($sb->getParts(), ["test1", "test2"]);
+        $this->assertEquals($sb->join(), "test1;test2");
+    }
+
+    public function testSetPartsOnUnique() {
+        $sb = new \NAE\String\StringBuilder(true);
+        $sb->setParts(["test1", "test2", "test1"])->setSeperator(";");
+        $this->assertEquals($sb->getParts(), ["test1", "test2"]);
+        $this->assertEquals($sb->join(), "test1;test2");
+    }
+
+    public function testSetPartsWithDuplicates() {
+        $sb = new \NAE\String\StringBuilder();
+        $sb->setParts(["test1", "test2", "test1"])->setSeperator(";");
+        $this->assertEquals($sb->getParts(), ["test1", "test2", "test1"]);
+        $this->assertEquals($sb->join(), "test1;test2;test1");
+    }
+
 }
\ No newline at end of file