Add test cases for nested calc expressions

Author: raxbg

tests/Sabberworm/CSS/ParserTest.php

@@ -395,6 +395,12 @@ function testCalcInFile() {
 		$this->assertSame($sExpected, $oDoc->render());
 	}
 
+	function testCalcNestedInFile() {
+		$oDoc = $this->parsedStructureForFile('calc-nested', Settings::create()->withMultibyteSupport(true));
+		$sExpected = '.test {font-size: calc(( 3 * 4px ) + -2px);top: calc(200px - calc(20 * 3px));}';
+		$this->assertSame($sExpected, $oDoc->render());
+	}
+
 	function testGridLineNameInFile() {
 		$oDoc = $this->parsedStructureForFile('grid-linename', Settings::create()->withMultibyteSupport(true));
 		$sExpected = "div {grid-template-columns: [linename] 100px;}\nspan {grid-template-columns: [linename1 linename2] 100px;}";

tests/files/calc-nested.css

@@ -0,0 +1,4 @@
+.test {
+  font-size: calc((3 * 4px) + -2px);
+  top: calc(200px - calc(20 * 3px));
+}