X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=blobdiff_plain;f=src%2Fword_utils.rs;h=4da2eb0f147aa37eb3f9338510ed595444181fe6;hp=d087820a1ec0fcb2a517cef8599d5db550844fdc;hb=1b525560d6d159c162eaa41d9672f61f6496b56d;hpb=824fd4371bafc487163edf33cb58b05fc4b22971

diff --git a/src/word_utils.rs b/src/word_utils.rs
index d087820..4da2eb0 100644
--- a/src/word_utils.rs
+++ b/src/word_utils.rs
@@ -17,3 +17,27 @@ pub fn second_word(s: &str) -> Option<&str> {
 
     return None;
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_first_word() {
+        assert_eq!(first_word(""), "");
+        assert_eq!(first_word("one"), "one");
+        assert_eq!(first_word("one two"), "one");
+
+        assert_eq!(first_word(&String::from("one two")), "one");
+    }
+
+    #[test]
+    fn test_second_word() {
+        assert_eq!(second_word(""), None);
+        assert_eq!(second_word("one"), None);
+        assert_eq!(second_word("one two"), Some("two"));
+        assert_eq!(second_word("one two three"), Some("two"));
+
+        assert_eq!(second_word(&String::from("one two three")), Some("two"));
+    }
+}