Add test for match example

examples/match.ds

@@ -1,9 +1,9 @@
-foo_or_bar = match (random_boolean) {
+foo_or_bar = match random_boolean() {
 	true => "foo"
 	false => "bar"
 }
 
-num = match (random_integer) {
+num = match random_integer() {
 	1 => "one",
 	2 => { "two" },
 	* => "neither",

tests/dust_examples.rs

@@ -81,6 +81,13 @@ fn map() {
     interpret(&file_contents).unwrap();
 }
 
+#[test]
+fn r#match() {
+    let file_contents = read_to_string("examples/match.ds").unwrap();
+
+    interpret(&file_contents).unwrap();
+}
+
 #[test]
 fn random() {
     let file_contents = read_to_string("examples/random.ds").unwrap();