Add tet case to ensure sc-opts are passed to snippet compiler

Author: WojciechMazur

scaladoc-testcases/docs/_docs/index.md

@@ -22,3 +22,14 @@ val renderer: Renderer = Renderer()
     extension (x: Self) def combine(y: Self): Self
 ```
 
+```scala sc:fail sc-opts:-Werror:true
+def exampleShouldError(input: Option[String]): Unit = 
+  input match
+    case Some("foo") => ???   
+```
+
+```scala sc:compile sc-opts:-Werror:false
+def exampleShouldWarn(input: Option[String]): Unit = 
+  input match
+    case Some("foo") => ???   
+```