add overall test

.gitignore

@@ -1,3 +1,2 @@
 /target
 .idea
-pkg

src/lib.rs

@@ -12,3 +12,13 @@ mod utils;
 pub fn convert_to_hiragana(text: &str) -> String {
     romanize(text).iter().map(|r| to_hiragana(r)).collect()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_convert_to_hiragana() {
+        assert_eq!(convert_to_hiragana("assolutamente"), "あっそるためんて");
+    }
+}