Additional assertions for getToken

Author: fintara

tests/CalculatorTest.php

@@ -17,8 +17,14 @@ public function setUp() {
     }
 
     public function testGetToken() {
-        $this->_calculator->setExpression("1+2-3");
+        $this->_calculator->setExpression('1+2-3');
         $this->assertEquals(['1', '+', '2', '-', '3'], $this->_calculator->getTokens());
+
+        $this->_calculator->setExpression('-5*(-5+1)');
+        $this->assertEquals(['-5', '*', '(', '-5', '+', '1', ')'], $this->_calculator->getTokens());
+
+        $this->_calculator->setExpression('sqrt(-5)');
+        $this->assertEquals(['sqrt', '(', '-5', ')'], $this->_calculator->getTokens());
     }
 }