Add additional testcase containing quotes

src/tests.rs

@@ -52,3 +52,17 @@ fn test_words_simple() {
     let case: Vec<String> = words(testcase);
     assert_eq!(case, verify);
 }
+
+#[test]
+fn test_words_quoted() {
+    let testcase: &str = "routine \"argument with spaces\" 1234 0x543";
+    let verify: Vec<String> = vec![
+        String::from("routine"),
+        String::from("\"argument with spaces\""),
+        String::from("1234"),
+        String::from("0x543"),
+    ];
+
+    let case: Vec<String> = words(testcase);
+    assert_eq!(case, verify);
+}